TamilNadu SSLC Question Paper PDF Password

TamilNadu SSLC Question Paper
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Tamilnadu Matriculation Question Paper
Tamilnadu ONGC Question Paper
Tamilnadu Matriculation Question Paper
How To Get SSLC State Board Question Paper For TamilNadu?
2007 Tamil Nadu State TAMIL QUESTION PAPERS OF SSLC EXAMINATION Question paper

10th Std Question Papers – Tamilnadu SSLC Questions

Tamilnadu 10th Standard SSLC Questions

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TamilNadu SSLC Question Paper PDF Password

TamilNadu SSLC Question Paper
Tamilnadu 10th Question Paper
Tamilnadu Matriculation Question Paper
Tamilnadu ONGC Question Paper
Tamilnadu Matriculation Question Paper
How To Get SSLC State Board Question Paper For TamilNadu?
2007 Tamil Nadu State TAMIL QUESTION PAPERS OF SSLC EXAMINATION Question paper

10th Std Question Papers – Tamilnadu SSLC Questions

Tamilnadu 10th Standard SSLC Questions

PASSWORD: www.topengineeringcollegesintamilnadu.blogspot.com
Copy and paste it
This is the password: www.topengineeringcollegesintamilnadu.blogspot.com

2009 CBSE Chemistry Question paper

2009 CBSE Chemistry Question paper

General Instructions :

i) All questions are compulsory.
ii) Marks for each question are indicated against it.
iii) Questions number 1 to 8 are very short answer questions and carry 1 mark each.
iv) Questions number 9 to 18 are short answer questions and carry 2 marks each.
v) Questions number 19 to 27 are also short answer questions and carry 3 marks each.
vi) Questions number 28 to 30 are long answer questions and carry 5 marks each.
vii) Use Log Tables,if necessary.Use of calculators is not allowed.

1.Name the type of defect present in NaCl.. [1]

2.The rate constant k=5.0X10-2L2mol-2s-2.What is the order of reaction ? [1]

3.Write the IUPAC name of HOOCCH2C(CH3)=CHCOOH [1]

4.How many tetrahedral voids are there in 1 mole of compound having cubic close packed structure ?

5.What are monomers of nucleic acids ? [1]

6.Why are alcohols soluble in water ? [1]

7.What are antipyretics?Give one example. [1]

8.Predict the shape of XeF4 on the basis of VSEPR theory. [1]

9.An element has bcc structure with edge length 288pm.Molar mass of element is 52 g mol-1.Calculate its density.

10.Account for the following : [2]

i) All adsorption processes are exothermic.

ii) Lyophilic sols are more stable than Lyophobic sols.

11. When concentrated Sulphuric acid is added to an unknown salt ‘A’ present in a test tube,a violet gas ‘B’ is evolved.This gas dissolves in KI solution more than water.The gas is also soluble in CCl4.Its solution in alcohol is used as an
antiseptic.Identify ‘A’ and ‘B’ and explain the observations.

12. Which is more acidic-phenol or p-nitrophenol ? Explain. [2]

13. How will you distinguish between : [2]

viii) Aniline and benzylamine.

ix) CH3CH2NH2 and (CH3)2NH.

14.Give mechanism to obtain Ethene from Ethanol. [2]

15.What are synthetic detergents ?Why do they work well in hard water ? give one example of anionic detergent.

16.i)What happens when NH3 reacts with excess of chlorine?Write the chemical equation.

ii) Blue vitriol becomes white on addition of Concentrated H2SO4.Explain.

17.Write the Riemer-Tiemann reaction of Phenol. [2]

18.Give mechanism of ß-elimination reaction of 2-bromobutane with [2]

alcoholic KOH.Why is it called nucleophilic elimination reaction ?

19.Vapour pressure of CHCl3 is 200mm Hg and CH2Cl2 415mm Hg at 298 K [3]

i) Calculate vapour pressure of solution prepared by mixing 25.5 g of

CHCl3 40 g of CH2Cl2 at 298 K.

ii) Mole fraction of each component in vapour phase.

20. Write reaction at cathode as well as anode and calculate i) E0cell and [3]

ii) ?G0 at 298 K for Mg(s)|Mg2+(1.0X10-3)||Cu2+(1.0X10-4)|Cu(s)

Given E0 Mg2+|Mg = -2.37 V, E0 Cu2+|Cu = + 0.34 V
OR

Calculate the temperature at which a solution containing 54 g of glucose

C6H12O6 in 250 g water will freeze.(Kf for water= 1.86 K Kg mol-1)

21.i) At site,low grade copper ores are available and Zinc and iron scraps [3]

are available.Which of the two scraps would be more suitable for reducing

leached copper ore and why ?

ii) How is Zirconium purified ?

iii) What is used as stationary phase in column chromatography ?

22. Explain the following : [3]

i) Transition metals show variable oxidation states.

ii) Zn,Cd,Hg are volatile metals.

iii) The ionization energy varies irregularly in first and second transition series.

23.What happens when Glucose reacts with : [3]
i) Excess of HI ii) Conc.HNO3 iii) Acetic anhydride

24. i) [Ni(CN)4]2- ion has square planar geometry and is diamagnetic whereas [3]
[NiCl4]2- has tetrahedral geometry and paramagnetic.Explain these characteristics on the basis of hybridization of orbitals.[At no. of Ni=28]
ii) Give an example of coordination compounds used in biological systems.

25. Complete the following reactions and balance them : [3]
i) NH3 + NaOCl ----à
ii) P4O6 + H2O ----à
iii) HNO3 + P2O5 ---à

26. i) Glucose has cyclic structure.Give two reasons. [3]
ii) What is meant by Mutarotation ? Explain with the help of example.

27. Give reasons for the following : [3]

i) CN- ion is known but CP- is not known.
ii) NO2 dimerises to form N2O4
iii) ICl is more reactive than I2

28. An organic compound ‘A’ with molecular formula C5H8O2 is reduced to n-pentane on treatment with Zn-Hg/HCl.’A’ forms a dioxime with hydroxylamine and gives a positive Iodoform test and Tollen’s reagent test.
Identify the compound A and deduce its structure.

29.i) State why is lowering of vapour pressure of solution a colligative [5]property

ii) Why is osmotic pressure used for determining molecular weight of biomolecules ?

iii) The boiling point elevation for 1.20 g of solute in 100 g of benzeneis 0.253 K.If the solute is acetic acid ,what conclusion would you draw
about the state of its molecule in this solution ?Kb for benzene is2.53 K kg mol-1.Calculate elevation in boiling point if solute behaves normally.

30.Give a chemical equation to illustrate the following processes- [5]

i) Reimer Tieman reaction
ii) Cannizzaro reaction

OR

Give reasons :

i) Transition metals form interstitial compounds.
ii) The third ionization energy of Mn is high.
iii) Chromium has high melting point.
iv) Zn,Cd,Hg are not regarded as transition metals.
v) There is decrease in atomic size with increasing atomic numbers of transition metals across a period.

2009 CBSE Communicative english Question paper General Instructions:

2009 CBSE Communicative english Question paperGeneral Instructions:

The paper is divided into four sections: A, B, C and D.

Section. A - Reading. ( 20 marks)
Section B. – Writing ( 30 marks)
Section C. – Grammar (20 marks)
Section D – Literature ( 30 marks)

---------------------------------------------------------------------------------------------------

All sections are compulsory.

1. Attempt all questions
2. Do not write anything in the question paper
3. Answer the questions in each section before going on to the next section
4. All the answers must be correctly numbered as in the question paper and written in the answer sheet provided to you.
5. Pleas adhere to the word limit given with each question. Marks will be deducted for exceeding the word limit.

SECTION –A (Reading) 20 marks

A.1. Dennis Waitley – The Motivational Speaker

The veteran best-selling author and motivational speaker Dennis Waitley has been in the business of inspiring others for about 40 years . He is one of America's most respected authors and keynote lecturers and productivity consultant on high performance human achievement . With over 10 million audio programs sold in fourteen languages , Dennis is one of the most listened-to voices on personal and career success. He's the author of fifteen non-fiction books which includes several international bestsellers .
Dennis has studied and counselled winners in every field from Apollo astronauts to Superbowl champions , from sales achievers to government leaders and youth groups During the eighties he served as chairman of Psychology on the U.S. Olympic Committee Sports Medicine Council , responsible for performance enhancement of all U.S. athletes .
Dennis says,"It has been a wonderful journey and I'm not trying to stop .I think that my children, grandchildren , great grandchildren keep me going , and I keep re- inventing myself ".
My daughter told me that they thought that they had to work a little hard to be successful , and interestingly both of them have become doctors in psychology . I hope I am learning and becoming a part of the future rather than rehashing information .Of course there are some basics truths that have to be rehashed again and again . I should not say ' rehashing ' ,we are explaining them in a language that is relevant to today's situation .
I travelled a great deal to China and India to see what the newest developing nations are going through to become successful . I think, the challenge for me is to continue to plant shade trees under which I wouldn't sit . So people are asked why don't you retire, but I like to learn and teach . The more I teach , the more I learn , it really is what keeps me going .
I always wondered why some people are angry and sad all the time and why some people are happy . At first I thought that maybe they were born that way. Certainly personality plays a part in it. I was raised during the 'Depression' at the beginning of the Second World War and my grandmother was the dominant influence in my life . She and I planted a ' Victory Garden' and grew our own food. She told me that what was on the seed package, those pictures , would come up if we planted those seeds and then she told me the same thing would happen in my life if I cultivated it . She told me to model my life on worthy people . The hunger in me to be better and to be something led me to understand that the best way to do that would be to help other people .

Earl Nightingale was one of our early twentieth century motivational speakers and philosophers . He coined the term' the strangest secret '. It postulates that we become what we think about most of the time. He became my mentor and he guided me to a record my thoughts because that's what he did.. He told me ' as you do all your work , don't believe that you are a world changer, know that you are just a seed planter and that you are not changing lives .

A.1.1 On the basis of your reading of the passage answer the questions given below(10 marks)

1. A motivational speaker is …………………………………………….
2. Examples from the first and second paragraphs to show that Dennis was a great success are:
3. The journey that Dennis talks about is …………………………………………
4. Dennis does not agree to use the word ' rehash' because……………………,,,,
5. What did Dennis' " Victory Garden" consist of ?
6. What kind of people did Dennis try to emulate ?
7. Dennis was ' hungry ' for something . What was it ?
8. Earl Nightingale's " The strangest secret " meant ………………………………

A.1.2. Find words from the passage which mean the following :(2 marks)

1. Advice –
2. Improvement –
3. Gloomy –
4. Role model –

A.2. Read the poem and answer the questions that follow it [ 8 marks]
Nurses song

When the voice of children are heard on the green
And laughing is heard on the hill
My heart is at rest within my breast
And everything else is still .
' Then come home , my children,the sun is gone down
And the dews of night arise ;
Come, come leave off play , and let us away
Tell the morning appears in the skies '
' No , no, let us play it is yet day,
And we cannot go to sleep;
Besides, in the sky the little birds fly
And the hills are covered with sheep.'
'Well, well, go and play till the light fades away
And then go home to bed '
The little ones leaped and shouted and laughed,
And all the hills echoed.'

A 2.1 On the basis of your reading of the passage answer the following questions [ 4 marks]
The nurse feels that a heart is interest because ………………………………………
She calls the children to come back, because ………………………………………….
The children try to convince the nurse that it is yet daily by saying that ……………..
And that the …………………………………………………………………………….

A 2.2 Given below are lines from the poem with some words missing . Complete the paragraph using suitable words . [ 4 marks]
Come ,………………………………. and let us away. Till the morning appears in the skies. No , no ………………………………………………………….. play . for it is ………………………………. day. And we ……………………….. sleep . besides , in the sky the little birds fly .

2009 CBSE Chemistry Question paper

2009 CBSE Chemistry Question paper

General Instructions :

i) All questions are compulsory.
ii) Marks for each question are indicated against it.
iii) Questions number 1 to 8 are very short answer questions and carry 1 mark each.
iv) Questions number 9 to 18 are short answer questions and carry 2 marks each.
v) Questions number 19 to 27 are also short answer questions and carry 3 marks each.
vi) Questions number 28 to 30 are long answer questions and carry 5 marks each.
vii) Use Log Tables,if necessary.Use of calculators is not allowed.

1.Name the type of defect present in NaCl.. [1]

2.The rate constant k=5.0X10-2L2mol-2s-2.What is the order of reaction ? [1]

3.Write the IUPAC name of HOOCCH2C(CH3)=CHCOOH [1]

4.How many tetrahedral voids are there in 1 mole of compound having cubic close packed structure ?

5.What are monomers of nucleic acids ? [1]

6.Why are alcohols soluble in water ? [1]

7.What are antipyretics?Give one example. [1]

8.Predict the shape of XeF4 on the basis of VSEPR theory. [1]

9.An element has bcc structure with edge length 288pm.Molar mass of element is 52 g mol-1.Calculate its density.

10.Account for the following : [2]

i) All adsorption processes are exothermic.

ii) Lyophilic sols are more stable than Lyophobic sols.

11. When concentrated Sulphuric acid is added to an unknown salt ‘A’ present in a test tube,a violet gas ‘B’ is evolved.This gas dissolves in KI solution more than water.The gas is also soluble in CCl4.Its solution in alcohol is used as an
antiseptic.Identify ‘A’ and ‘B’ and explain the observations.

12. Which is more acidic-phenol or p-nitrophenol ? Explain. [2]

13. How will you distinguish between : [2]

viii) Aniline and benzylamine.

ix) CH3CH2NH2 and (CH3)2NH.

14.Give mechanism to obtain Ethene from Ethanol. [2]

15.What are synthetic detergents ?Why do they work well in hard water ? give one example of anionic detergent.

16.i)What happens when NH3 reacts with excess of chlorine?Write the chemical equation.

ii) Blue vitriol becomes white on addition of Concentrated H2SO4.Explain.

17.Write the Riemer-Tiemann reaction of Phenol. [2]

18.Give mechanism of ß-elimination reaction of 2-bromobutane with [2]

alcoholic KOH.Why is it called nucleophilic elimination reaction ?

19.Vapour pressure of CHCl3 is 200mm Hg and CH2Cl2 415mm Hg at 298 K [3]

i) Calculate vapour pressure of solution prepared by mixing 25.5 g of

CHCl3 40 g of CH2Cl2 at 298 K.

ii) Mole fraction of each component in vapour phase.

20. Write reaction at cathode as well as anode and calculate i) E0cell and [3]

ii) ?G0 at 298 K for Mg(s)|Mg2+(1.0X10-3)||Cu2+(1.0X10-4)|Cu(s)

Given E0 Mg2+|Mg = -2.37 V, E0 Cu2+|Cu = + 0.34 V
OR

Calculate the temperature at which a solution containing 54 g of glucose

C6H12O6 in 250 g water will freeze.(Kf for water= 1.86 K Kg mol-1)

21.i) At site,low grade copper ores are available and Zinc and iron scraps [3]

are available.Which of the two scraps would be more suitable for reducing

leached copper ore and why ?

ii) How is Zirconium purified ?

iii) What is used as stationary phase in column chromatography ?

22. Explain the following : [3]

i) Transition metals show variable oxidation states.

ii) Zn,Cd,Hg are volatile metals.

iii) The ionization energy varies irregularly in first and second transition series.

23.What happens when Glucose reacts with : [3]
i) Excess of HI ii) Conc.HNO3 iii) Acetic anhydride

24. i) [Ni(CN)4]2- ion has square planar geometry and is diamagnetic whereas [3]
[NiCl4]2- has tetrahedral geometry and paramagnetic.Explain these characteristics on the basis of hybridization of orbitals.[At no. of Ni=28]
ii) Give an example of coordination compounds used in biological systems.

25. Complete the following reactions and balance them : [3]
i) NH3 + NaOCl ----à
ii) P4O6 + H2O ----à
iii) HNO3 + P2O5 ---à

26. i) Glucose has cyclic structure.Give two reasons. [3]
ii) What is meant by Mutarotation ? Explain with the help of example.

27. Give reasons for the following : [3]

i) CN- ion is known but CP- is not known.
ii) NO2 dimerises to form N2O4
iii) ICl is more reactive than I2

28. An organic compound ‘A’ with molecular formula C5H8O2 is reduced to n-pentane on treatment with Zn-Hg/HCl.’A’ forms a dioxime with hydroxylamine and gives a positive Iodoform test and Tollen’s reagent test.
Identify the compound A and deduce its structure.

29.i) State why is lowering of vapour pressure of solution a colligative [5]property

ii) Why is osmotic pressure used for determining molecular weight of biomolecules ?

iii) The boiling point elevation for 1.20 g of solute in 100 g of benzeneis 0.253 K.If the solute is acetic acid ,what conclusion would you draw
about the state of its molecule in this solution ?Kb for benzene is2.53 K kg mol-1.Calculate elevation in boiling point if solute behaves normally.

30.Give a chemical equation to illustrate the following processes- [5]

i) Reimer Tieman reaction
ii) Cannizzaro reaction

OR

Give reasons :

i) Transition metals form interstitial compounds.
ii) The third ionization energy of Mn is high.
iii) Chromium has high melting point.
iv) Zn,Cd,Hg are not regarded as transition metals.
v) There is decrease in atomic size with increasing atomic numbers of transition metals across a period.

2009 CBSE Communicative english Question paper General Instructions:

2009 CBSE Communicative english Question paperGeneral Instructions:

The paper is divided into four sections: A, B, C and D.

Section. A - Reading. ( 20 marks)
Section B. – Writing ( 30 marks)
Section C. – Grammar (20 marks)
Section D – Literature ( 30 marks)

---------------------------------------------------------------------------------------------------

All sections are compulsory.

1. Attempt all questions
2. Do not write anything in the question paper
3. Answer the questions in each section before going on to the next section
4. All the answers must be correctly numbered as in the question paper and written in the answer sheet provided to you.
5. Pleas adhere to the word limit given with each question. Marks will be deducted for exceeding the word limit.

SECTION –A (Reading) 20 marks

A.1. Dennis Waitley – The Motivational Speaker

The veteran best-selling author and motivational speaker Dennis Waitley has been in the business of inspiring others for about 40 years . He is one of America's most respected authors and keynote lecturers and productivity consultant on high performance human achievement . With over 10 million audio programs sold in fourteen languages , Dennis is one of the most listened-to voices on personal and career success. He's the author of fifteen non-fiction books which includes several international bestsellers .
Dennis has studied and counselled winners in every field from Apollo astronauts to Superbowl champions , from sales achievers to government leaders and youth groups During the eighties he served as chairman of Psychology on the U.S. Olympic Committee Sports Medicine Council , responsible for performance enhancement of all U.S. athletes .
Dennis says,"It has been a wonderful journey and I'm not trying to stop .I think that my children, grandchildren , great grandchildren keep me going , and I keep re- inventing myself ".
My daughter told me that they thought that they had to work a little hard to be successful , and interestingly both of them have become doctors in psychology . I hope I am learning and becoming a part of the future rather than rehashing information .Of course there are some basics truths that have to be rehashed again and again . I should not say ' rehashing ' ,we are explaining them in a language that is relevant to today's situation .
I travelled a great deal to China and India to see what the newest developing nations are going through to become successful . I think, the challenge for me is to continue to plant shade trees under which I wouldn't sit . So people are asked why don't you retire, but I like to learn and teach . The more I teach , the more I learn , it really is what keeps me going .
I always wondered why some people are angry and sad all the time and why some people are happy . At first I thought that maybe they were born that way. Certainly personality plays a part in it. I was raised during the 'Depression' at the beginning of the Second World War and my grandmother was the dominant influence in my life . She and I planted a ' Victory Garden' and grew our own food. She told me that what was on the seed package, those pictures , would come up if we planted those seeds and then she told me the same thing would happen in my life if I cultivated it . She told me to model my life on worthy people . The hunger in me to be better and to be something led me to understand that the best way to do that would be to help other people .

Earl Nightingale was one of our early twentieth century motivational speakers and philosophers . He coined the term' the strangest secret '. It postulates that we become what we think about most of the time. He became my mentor and he guided me to a record my thoughts because that's what he did.. He told me ' as you do all your work , don't believe that you are a world changer, know that you are just a seed planter and that you are not changing lives .

A.1.1 On the basis of your reading of the passage answer the questions given below(10 marks)

1. A motivational speaker is …………………………………………….
2. Examples from the first and second paragraphs to show that Dennis was a great success are:
3. The journey that Dennis talks about is …………………………………………
4. Dennis does not agree to use the word ' rehash' because……………………,,,,
5. What did Dennis' " Victory Garden" consist of ?
6. What kind of people did Dennis try to emulate ?
7. Dennis was ' hungry ' for something . What was it ?
8. Earl Nightingale's " The strangest secret " meant ………………………………

A.1.2. Find words from the passage which mean the following :(2 marks)

1. Advice –
2. Improvement –
3. Gloomy –
4. Role model –

A.2. Read the poem and answer the questions that follow it [ 8 marks]
Nurses song

When the voice of children are heard on the green
And laughing is heard on the hill
My heart is at rest within my breast
And everything else is still .
' Then come home , my children,the sun is gone down
And the dews of night arise ;
Come, come leave off play , and let us away
Tell the morning appears in the skies '
' No , no, let us play it is yet day,
And we cannot go to sleep;
Besides, in the sky the little birds fly
And the hills are covered with sheep.'
'Well, well, go and play till the light fades away
And then go home to bed '
The little ones leaped and shouted and laughed,
And all the hills echoed.'

A 2.1 On the basis of your reading of the passage answer the following questions [ 4 marks]
The nurse feels that a heart is interest because ………………………………………
She calls the children to come back, because ………………………………………….
The children try to convince the nurse that it is yet daily by saying that ……………..
And that the …………………………………………………………………………….

A 2.2 Given below are lines from the poem with some words missing . Complete the paragraph using suitable words . [ 4 marks]
Come ,………………………………. and let us away. Till the morning appears in the skies. No , no ………………………………………………………….. play . for it is ………………………………. day. And we ……………………….. sleep . besides , in the sky the little birds fly .

2010 CBSE Business Studies Sample Paper Question paper

2010 CBSE Business Studies Sample Paper Question paper

CBSE SAMPLE PAPER: 2010
CLASS: XII
SUBJECT: BUSINESS STUDIES
Time : 3Hrs M.M.: 100

1. Why management is considered a multifaceted concept?
2. Name the term given to difference between actual performance and planned performance.
3. Why dividend decision is known as residual decision?
4. Why packaging is called a silent salesman?
5. Name the level engaged in overseeing the activities of workers.
6. Which policy of Central Government has moved India towards privatization?
7. What is meant by “Span of Management”?
8. Name the training method in which the knowledge of many departments is imparted?
9. Differentiate between aptitude test and trade test.
10. When deviation is said to be negative? (1 X 10 = 10)
11. It aims at inviting more and more people to apply for the jobs. Name and explain the process.
12. “Coordination is not a separate function of management, it is the essence of management.” Briefly explain this statement.
13. You are the finance manager of a company. The firm has earned a huge amount of profit in this year and management wants to retain the profits in business for growth opportunities without distributing any dividend. Advise the management, if there are any negative impacts on the organization due to this decision.
14. Length of production cycle affects the working capital requirement of an organization. Explain how?
15. Explain dematerialization of securities and insider trading. (3 X 5 = 15)
16. Some products affect only significant group of buyers. Identify the kind of products and also explain their features.
17. Differentiate between capital market and money market on any four basis.
18. Inspite of the best efforts planning sometimes fails due to its limitations. Explain its any four limitations.
19. Briefly explain the steps involved in orginising process.
20. Explain with examples any four dimensions of business environment. (4 X 5 =20)
21. Some learning opportunities are designed and delivered to improve skills and abilities of employees whereas some others are designed to help in the growth of individual in all respects. Identify the concepts and differentiate between them.
22. Distinguish between NSEI and OTCEI.
23. How are shareholders likely to gain with the loan component in the capital structure?
24. Differentiate between the product concept and production concept of marketing.
25. Do you think management has characteristics of full fledged profession? (5 X 5 = 25)
26. “The post of supervisor should be abolished in the hierarchy of managers.” Do you agree? Give reasons. OR
Explain the various steps involved in the process of controlling.
27. What is meant by divisional structure in an organization? Explain its any two advantages and any two limitations. OR
Explain the meaning and process of delegation of authority.
28. Explain in brief any three qualities of a good brand name. Also, explain in brief any three functions of packaging. OR
‘Advertising misleads customers and increases the cost of products.’ Do you agree with this
statement? Give reasons in support of your answer.
29. Explain the meaning and importance of financial planning.
OR
Briefly explain the steps involved in process of financial planning.

30. Explain the rights available to consumer under the Consumer Protection Act.
OR
Explain in brief any six remedies available to consumer under Consumer Protection Act,
1986. (6 x 5 = 30)

2010 CBSE Business Studies Sample Paper Question paper

2010 CBSE Business Studies Sample Paper Question paper

CBSE SAMPLE PAPER: 2010
CLASS: XII
SUBJECT: BUSINESS STUDIES
Time : 3Hrs M.M.: 100

1. Why management is considered a multifaceted concept?
2. Name the term given to difference between actual performance and planned performance.
3. Why dividend decision is known as residual decision?
4. Why packaging is called a silent salesman?
5. Name the level engaged in overseeing the activities of workers.
6. Which policy of Central Government has moved India towards privatization?
7. What is meant by “Span of Management”?
8. Name the training method in which the knowledge of many departments is imparted?
9. Differentiate between aptitude test and trade test.
10. When deviation is said to be negative? (1 X 10 = 10)
11. It aims at inviting more and more people to apply for the jobs. Name and explain the process.
12. “Coordination is not a separate function of management, it is the essence of management.” Briefly explain this statement.
13. You are the finance manager of a company. The firm has earned a huge amount of profit in this year and management wants to retain the profits in business for growth opportunities without distributing any dividend. Advise the management, if there are any negative impacts on the organization due to this decision.
14. Length of production cycle affects the working capital requirement of an organization. Explain how?
15. Explain dematerialization of securities and insider trading. (3 X 5 = 15)
16. Some products affect only significant group of buyers. Identify the kind of products and also explain their features.
17. Differentiate between capital market and money market on any four basis.
18. Inspite of the best efforts planning sometimes fails due to its limitations. Explain its any four limitations.
19. Briefly explain the steps involved in orginising process.
20. Explain with examples any four dimensions of business environment. (4 X 5 =20)
21. Some learning opportunities are designed and delivered to improve skills and abilities of employees whereas some others are designed to help in the growth of individual in all respects. Identify the concepts and differentiate between them.
22. Distinguish between NSEI and OTCEI.
23. How are shareholders likely to gain with the loan component in the capital structure?
24. Differentiate between the product concept and production concept of marketing.
25. Do you think management has characteristics of full fledged profession? (5 X 5 = 25)
26. “The post of supervisor should be abolished in the hierarchy of managers.” Do you agree? Give reasons. OR
Explain the various steps involved in the process of controlling.
27. What is meant by divisional structure in an organization? Explain its any two advantages and any two limitations. OR
Explain the meaning and process of delegation of authority.
28. Explain in brief any three qualities of a good brand name. Also, explain in brief any three functions of packaging. OR
‘Advertising misleads customers and increases the cost of products.’ Do you agree with this
statement? Give reasons in support of your answer.
29. Explain the meaning and importance of financial planning.
OR
Briefly explain the steps involved in process of financial planning.

30. Explain the rights available to consumer under the Consumer Protection Act.
OR
Explain in brief any six remedies available to consumer under Consumer Protection Act,
1986. (6 x 5 = 30)

2009 CBSE Guess Paper – 2009 Class – XII Subject – ACCOUNTANCY Question paper Guess Paper – 2009

2009 CBSE Guess Paper – 2009 Class – XII Subject – ACCOUNTANCY Question paper
Guess Paper – 2009
Class – XI
Subject – ACCOUNTANCY
Time : 3 hours Marks: 100

1. Explain the meaning of the following terms with example: a. Debtors and creditors b. Receivables and payables. -4

2. Following are the transaction of Amar Ltd post them into the ledger of Rakesh. -6
2007
Feb 1 Rakesh purchased goods of Rs.5000
Feb 3 Rakesh sold goods of Rs.30000 to Amar
Feb 8 Rakesh paid cash of Rs.2000
Feb 10 He returned goods of Rs.2000 purchased by him

3. Show the accounting equation on the basis of the following transactions. (7+7)
a. opening balances of assets: cash Rs.40000, goods Rs.20000 and furniture Rs.1000
b. sold goods to Vikram on credit costing Rs.400 for Rs.500
c. paid salary in advance Rs.500
d. rent outstanding Rs.100
e. charge deprecation on furniture Rs.100
f. goods lost by fire Rs.500
g. purchased household furniture for Rs.15000, giving Rs.5000 in cash and balance through a loan.

4. Give journal entries in the books of Mr.Naresh: -10
2008
Jan 1 started business with Rs.10000
Jan 2 purchased goods from Gautam of Rs.1000 at 10% trade discount.
Jan 5 Naresh sold goods of Rs.5000 @5% trade discount and 10% cash discount.
Jan 10 Naresh returned goods of Rs.200
Jan 14 gave away as charity goods of Rs.500 and cash Rs.520.

5. Record the following in Double Column Cash Book of Savitri.
-10
2006
Oct 1 cash in hand 2100
Bank overdraft 5600
Oct 3 purchased goods by cheque 1860
Oct 8 paid into bank 2000
Oct 10 cash sales at a discount of 2% 20000
Oct 15 received from Ankit Rs.300 and discount allowed Rs.25
Oct 20 purchased a computer and paid by cheque Rs.15900
Oct 25 deposited into bank all cash except Rs.100

6. Prepare purchase book from the following transactions of August 2004. -10
Aug 4 purchased from Prem Bros. Delhi :
50 tins Golda Refined Oil @Rs.600 per tin
50 tins Postman Refined Oil @Rs. 300 per tin
40 bags sugar @ 1500 per Qt.
(Weight of one bag 95 kgs)
Aug 16 purchased form Gain Chand Mahender Kumar
50 tins Golda Refined Oil @Rs.600 per tin
100 Bags Parmal Rice @Rs. 750 per bag
Aug 20 purchased from Mayank Trading Company
50 bags sugar @Rs, 1450 per Qt
(Weight of one bag 95 kgs)
50 bags rice @Rs.750 per bag.

7. Prepare the sales book from the following transactions. -10
2004
Jan 1 sold goods to Nanda on credit 1000
Jan 5 sold goods to Desai and Co. 885, Vat @10%
Jan 15 Goods purchased by Anil from us Rs.8000 @10% trade discount.
Jan 18 sale made to Bhanu Mal Rs.2800, Vat @5%
Feb 3 goods purchased by Sunder 1500

8. Prepare petty cash book on the basis of the following transactions in the books of Swami Agencies. The cash book is maintained on imprest system. -12
Date Voucher no. Particulars Amount
2006
Jan 1
Jan 1

Jan. 10

Jan 18
1
201
202
204
205
206
207
208
209
210
211
Opening balance
Postage stamps purchase
Conveyance paid
Paid for snacks in office
Cartage paid
Stationery purchased
Taxi fare paid
Telegram charges
Stamps purchased
Drawing pins purchased
Sundry expenses
2000
55
65
130
15
85
78
24
12
6
320

9. Prepare purchased return and sales return book from the following transactions of December , 2004. -12

Dec 2 returned to Baluja Shoe Company, Agra
50 repairs Chappals @Rs.100 per pair being not upto the approved sample. Less 10% trade discount
Dec 12 returned to Mayur Shoe Company, Amabala
20 pairs sports shoe @Rs.250 per pair
30 pairs P.T. shoes @Rs.50 per pair being defective. Less 20% trade discount
Dec 18 Kashmir Boot House returned to us
10 pairs shoes @Rs.200 per pair being goods supplied without getting order. , vat @10%
Dec 23 college shoes, Ambala returned to us:
10 pairs ladies chappal @Rs.60 per pair
5 pairs ladies scandals @Rs.200 per pair
Dec 28 returned to rose shoes company
15 pairs school shoes @Rs.70 per pair
100 pairs plastic chappal @Rs.40 per pair

10. From the following particulars, ascertain the bank balance as per pass book as on 30th June,1996: -12
1. Credit balance as per cash book on 30.6.97 Rs.3000
2. Interest debited by bank Rs.100
3. Bank charges debited by bank Rs.40
4. Cheques of Rs.5000 deposited but cheques of Rs.3700 were credited by the bank upto 30.06.97
5. Two cheques of Rs.1500 and Rs.3000 were issued but only one cheque of Rs.1500 was presented for payment
6. Dividend on shares Rs.750 collected by bank, but no entry has been passed in the cash book
7. Cheque issued but not recorded in the cash book Rs.1000
8. Debit side of the cash book underacted by Rs.1000

2009 CBSE Guess Paper – 2009 Class – XII Subject – ACCOUNTANCY Question paper Guess Paper – 2009

2009 CBSE Guess Paper – 2009 Class – XII Subject – ACCOUNTANCY Question paper
Guess Paper – 2009
Class – XI
Subject – ACCOUNTANCY
Time : 3 hours Marks: 100

1. Explain the meaning of the following terms with example: a. Debtors and creditors b. Receivables and payables. -4

2. Following are the transaction of Amar Ltd post them into the ledger of Rakesh. -6
2007
Feb 1 Rakesh purchased goods of Rs.5000
Feb 3 Rakesh sold goods of Rs.30000 to Amar
Feb 8 Rakesh paid cash of Rs.2000
Feb 10 He returned goods of Rs.2000 purchased by him

3. Show the accounting equation on the basis of the following transactions. (7+7)
a. opening balances of assets: cash Rs.40000, goods Rs.20000 and furniture Rs.1000
b. sold goods to Vikram on credit costing Rs.400 for Rs.500
c. paid salary in advance Rs.500
d. rent outstanding Rs.100
e. charge deprecation on furniture Rs.100
f. goods lost by fire Rs.500
g. purchased household furniture for Rs.15000, giving Rs.5000 in cash and balance through a loan.

4. Give journal entries in the books of Mr.Naresh: -10
2008
Jan 1 started business with Rs.10000
Jan 2 purchased goods from Gautam of Rs.1000 at 10% trade discount.
Jan 5 Naresh sold goods of Rs.5000 @5% trade discount and 10% cash discount.
Jan 10 Naresh returned goods of Rs.200
Jan 14 gave away as charity goods of Rs.500 and cash Rs.520.

5. Record the following in Double Column Cash Book of Savitri.
-10
2006
Oct 1 cash in hand 2100
Bank overdraft 5600
Oct 3 purchased goods by cheque 1860
Oct 8 paid into bank 2000
Oct 10 cash sales at a discount of 2% 20000
Oct 15 received from Ankit Rs.300 and discount allowed Rs.25
Oct 20 purchased a computer and paid by cheque Rs.15900
Oct 25 deposited into bank all cash except Rs.100

6. Prepare purchase book from the following transactions of August 2004. -10
Aug 4 purchased from Prem Bros. Delhi :
50 tins Golda Refined Oil @Rs.600 per tin
50 tins Postman Refined Oil @Rs. 300 per tin
40 bags sugar @ 1500 per Qt.
(Weight of one bag 95 kgs)
Aug 16 purchased form Gain Chand Mahender Kumar
50 tins Golda Refined Oil @Rs.600 per tin
100 Bags Parmal Rice @Rs. 750 per bag
Aug 20 purchased from Mayank Trading Company
50 bags sugar @Rs, 1450 per Qt
(Weight of one bag 95 kgs)
50 bags rice @Rs.750 per bag.

7. Prepare the sales book from the following transactions. -10
2004
Jan 1 sold goods to Nanda on credit 1000
Jan 5 sold goods to Desai and Co. 885, Vat @10%
Jan 15 Goods purchased by Anil from us Rs.8000 @10% trade discount.
Jan 18 sale made to Bhanu Mal Rs.2800, Vat @5%
Feb 3 goods purchased by Sunder 1500

8. Prepare petty cash book on the basis of the following transactions in the books of Swami Agencies. The cash book is maintained on imprest system. -12
Date Voucher no. Particulars Amount
2006
Jan 1
Jan 1

Jan. 10

Jan 18
1
201
202
204
205
206
207
208
209
210
211
Opening balance
Postage stamps purchase
Conveyance paid
Paid for snacks in office
Cartage paid
Stationery purchased
Taxi fare paid
Telegram charges
Stamps purchased
Drawing pins purchased
Sundry expenses
2000
55
65
130
15
85
78
24
12
6
320

9. Prepare purchased return and sales return book from the following transactions of December , 2004. -12

Dec 2 returned to Baluja Shoe Company, Agra
50 repairs Chappals @Rs.100 per pair being not upto the approved sample. Less 10% trade discount
Dec 12 returned to Mayur Shoe Company, Amabala
20 pairs sports shoe @Rs.250 per pair
30 pairs P.T. shoes @Rs.50 per pair being defective. Less 20% trade discount
Dec 18 Kashmir Boot House returned to us
10 pairs shoes @Rs.200 per pair being goods supplied without getting order. , vat @10%
Dec 23 college shoes, Ambala returned to us:
10 pairs ladies chappal @Rs.60 per pair
5 pairs ladies scandals @Rs.200 per pair
Dec 28 returned to rose shoes company
15 pairs school shoes @Rs.70 per pair
100 pairs plastic chappal @Rs.40 per pair

10. From the following particulars, ascertain the bank balance as per pass book as on 30th June,1996: -12
1. Credit balance as per cash book on 30.6.97 Rs.3000
2. Interest debited by bank Rs.100
3. Bank charges debited by bank Rs.40
4. Cheques of Rs.5000 deposited but cheques of Rs.3700 were credited by the bank upto 30.06.97
5. Two cheques of Rs.1500 and Rs.3000 were issued but only one cheque of Rs.1500 was presented for payment
6. Dividend on shares Rs.750 collected by bank, but no entry has been passed in the cash book
7. Cheque issued but not recorded in the cash book Rs.1000
8. Debit side of the cash book underacted by Rs.1000

2009 CBSE Guess Paper – 2009 Class – XII Subject – ECONOMICS Question paper

2009 CBSE Guess Paper – 2009 Class – XII Subject – ECONOMICS Question paper

Guess Paper – 2009
Class – XII
Subject – ECONOMICS
Time: 3 hours M.M 100
General instructions:
1. All questions in both the sections are compulsory.
1. Marks for questions are indicated against each.
2. Questions 1 -5 and 17-21 are very short answer questions carrying 1 mark.
They are to be answered in one sentence each.
3. Questions 6-10 and 22-26 are short answer questions carrying 3 marks each. Answers to them should not normally exceed 60 words each.
4. Questions 11-13 and 27-29 are also short answer questions of 4 marks each. Answers to them should not normally exceed 70 words each.
5. Questions 14- 16 and 30-32 are long answer questions of 6 marks each. Answers to them should not normally exceed 100 words each.
6. Answers should be brief and to the point and the above word limits be adhered to as far as possible.
7. All parts of the question should be answered at one place.

INTRODUCTORY MICRO ECONOMICS

1. What is the price elasticity of supply of a commodity whose straight line supply curve passes through the origin forming an angle of 75°? [1]
2. Why does an economic problem arise? [1]
3. What induces new firms to enter an industry? [1]
4. At what price- higher or lower than the equilibrium price, will there be excess demand? [1]
5. Define Production Function. [1]
6. Give three reasons of a leftward shift of supply curve. [3]
7. Show the effect of an increase in price on total expenditure depending on the values of price elasticity. [3]
8. Explain the problem of allocation of resources. [3]
OR
Explain why a production possibility curve is concave
9. Define marginal revenue. State the relation between MR and AR when a firm—
i) is able to sell more quantity of output at the same price
ii) is able to sell more quantity of output only by lowering the price. [3]

10. When the price of a commodity rises from Rs. 10 to Rs.11 per unit, its quantity supplied rises by 100 units. Its price elasticity of supply is 2. Calculate its quantity supplied at the increased price. [3]
11. Distinguish between Monopoly and Monopolistic Competition.
OR
Explain the implication of the features ‘product differentiation’ and ‘freedom of
Entry and exit of firms’ under monopolistic competition. [4]
12. Find the profit maximising level of output from the following: [4]
Quantity Sold Price ATC
(units) (Rs per unit) (Rs)

7 10 6
8 9 5
9 8 6
10 7 7
13. Explain the effects of: (i) change in income, and
(ii) favourable change in taste on demand for a good. [4]

14. Define decrease in demand. There is a simultaneous ‘decrease’ in demand and supply of a commodity. When will it result in –
(a) no change in equilibrium price
(b) a fall in equilibrium price. Explain with diagrams. [6]

15. Define Producer’s equilibrium. Explain the conditions of producer’s equilibrium in terms of Total Cost and Total Revenue using diagram. [6]
16. Distinguish between increasing returns to a factor and increasing returns to scale stating reasons for them. [6]

INTRODUCTORY MACRO ECONOMICS

17. Why is Tax not a capital receipt? [1]
18. What is meant by Cash Reserve Ratio? [1]
19. Give the meaning of involuntary unemployment. [1]
20. What happens to the level of national income if intended savings exceed intended investment? [1]
21. What will be the effect of a rise in bank rate on money supply? [1]
22. What is meant by investment multiplier? Explain the relationship between MPS and multiplier with examples. [3]
23. Distinguish between APC and MPC. Draw a hypothetical propensity to consume curve and from it draw a propensity to save curve. [3]
24. Define fiscal deficit. Can there be a fiscal deficit in a Government Budget without a revenue deficit? Explain. [3]
OR
What are the implications of a large revenue deficit? Give two measures to
reduce this deficit.
25. Distinguish between revenue expenditure and capital expenditure with
examples. [3]
26. Explain any two drawbacks of barter system. How does money help in removing these drawbacks? [3]
27. What are the various types of deposit accounts of commercial banks? Explain them. [4]
28. What is fiscal policy? Explain two fiscal measures to solve the problem of deficient demand. [4]
29. An increase of Rs.250 crores in investment in an economy resulted in total increase in income of Rs.1000 crore. Calculate the following:
a. Marginal propensity to consume
b. Change in Savings
c. Change in consumption expenditure
d. Value of multiplier [4]

30. Explain three precautions that should be taken while estimating national income by
value added and income method respectively. [6]

31. Explain the equilibrium level of income and output with the help of consumption and investment curves. If planned expenditure is less than planned output, what changes will take place in the economy? [6]

32. Calculate Gross National Product at Market Price and Net National Disposable
Income from the following data: [6]
Rs. Crores
1. Current transfers from government 25
2. Compensation of employees 600
3. Net current transfers from rest of the world 20
4. Rent 100
5. Consumption of fixed capital 50
6. Interest 120
7. Net Indirect taxes 110
8. Profit 80
9. Mixed Income of self employed 200
10. Net factor income from abroad (-) 10

2009 CBSE Guess Paper – 2009 Class – XII Subject – ECONOMICS Question paper

2009 CBSE Guess Paper – 2009 Class – XII Subject – ECONOMICS Question paper

Guess Paper – 2009
Class – XII
Subject – ECONOMICS
Time: 3 hours M.M 100
General instructions:
1. All questions in both the sections are compulsory.
1. Marks for questions are indicated against each.
2. Questions 1 -5 and 17-21 are very short answer questions carrying 1 mark.
They are to be answered in one sentence each.
3. Questions 6-10 and 22-26 are short answer questions carrying 3 marks each. Answers to them should not normally exceed 60 words each.
4. Questions 11-13 and 27-29 are also short answer questions of 4 marks each. Answers to them should not normally exceed 70 words each.
5. Questions 14- 16 and 30-32 are long answer questions of 6 marks each. Answers to them should not normally exceed 100 words each.
6. Answers should be brief and to the point and the above word limits be adhered to as far as possible.
7. All parts of the question should be answered at one place.

INTRODUCTORY MICRO ECONOMICS

1. What is the price elasticity of supply of a commodity whose straight line supply curve passes through the origin forming an angle of 75°? [1]
2. Why does an economic problem arise? [1]
3. What induces new firms to enter an industry? [1]
4. At what price- higher or lower than the equilibrium price, will there be excess demand? [1]
5. Define Production Function. [1]
6. Give three reasons of a leftward shift of supply curve. [3]
7. Show the effect of an increase in price on total expenditure depending on the values of price elasticity. [3]
8. Explain the problem of allocation of resources. [3]
OR
Explain why a production possibility curve is concave
9. Define marginal revenue. State the relation between MR and AR when a firm—
i) is able to sell more quantity of output at the same price
ii) is able to sell more quantity of output only by lowering the price. [3]

10. When the price of a commodity rises from Rs. 10 to Rs.11 per unit, its quantity supplied rises by 100 units. Its price elasticity of supply is 2. Calculate its quantity supplied at the increased price. [3]
11. Distinguish between Monopoly and Monopolistic Competition.
OR
Explain the implication of the features ‘product differentiation’ and ‘freedom of
Entry and exit of firms’ under monopolistic competition. [4]
12. Find the profit maximising level of output from the following: [4]
Quantity Sold Price ATC
(units) (Rs per unit) (Rs)

7 10 6
8 9 5
9 8 6
10 7 7
13. Explain the effects of: (i) change in income, and
(ii) favourable change in taste on demand for a good. [4]

14. Define decrease in demand. There is a simultaneous ‘decrease’ in demand and supply of a commodity. When will it result in –
(a) no change in equilibrium price
(b) a fall in equilibrium price. Explain with diagrams. [6]

15. Define Producer’s equilibrium. Explain the conditions of producer’s equilibrium in terms of Total Cost and Total Revenue using diagram. [6]
16. Distinguish between increasing returns to a factor and increasing returns to scale stating reasons for them. [6]

INTRODUCTORY MACRO ECONOMICS

17. Why is Tax not a capital receipt? [1]
18. What is meant by Cash Reserve Ratio? [1]
19. Give the meaning of involuntary unemployment. [1]
20. What happens to the level of national income if intended savings exceed intended investment? [1]
21. What will be the effect of a rise in bank rate on money supply? [1]
22. What is meant by investment multiplier? Explain the relationship between MPS and multiplier with examples. [3]
23. Distinguish between APC and MPC. Draw a hypothetical propensity to consume curve and from it draw a propensity to save curve. [3]
24. Define fiscal deficit. Can there be a fiscal deficit in a Government Budget without a revenue deficit? Explain. [3]
OR
What are the implications of a large revenue deficit? Give two measures to
reduce this deficit.
25. Distinguish between revenue expenditure and capital expenditure with
examples. [3]
26. Explain any two drawbacks of barter system. How does money help in removing these drawbacks? [3]
27. What are the various types of deposit accounts of commercial banks? Explain them. [4]
28. What is fiscal policy? Explain two fiscal measures to solve the problem of deficient demand. [4]
29. An increase of Rs.250 crores in investment in an economy resulted in total increase in income of Rs.1000 crore. Calculate the following:
a. Marginal propensity to consume
b. Change in Savings
c. Change in consumption expenditure
d. Value of multiplier [4]

30. Explain three precautions that should be taken while estimating national income by
value added and income method respectively. [6]

31. Explain the equilibrium level of income and output with the help of consumption and investment curves. If planned expenditure is less than planned output, what changes will take place in the economy? [6]

32. Calculate Gross National Product at Market Price and Net National Disposable
Income from the following data: [6]
Rs. Crores
1. Current transfers from government 25
2. Compensation of employees 600
3. Net current transfers from rest of the world 20
4. Rent 100
5. Consumption of fixed capital 50
6. Interest 120
7. Net Indirect taxes 110
8. Profit 80
9. Mixed Income of self employed 200
10. Net factor income from abroad (-) 10

2010 CBSE Sample Paper – 2010 Class – XII Subject – Physics Question paper

2010 CBSE Sample Paper – 2010 Class – XII Subject – Physics Question paper
Sample Paper – 2010
Class – XII
Subject – Physics

1. Two point charges q1 and q2 are placed close to each other. What is the nature of the force between them when: (i) q1q2 <>0? 1

2. An electron an a proton, having equal momenta, enter a uniform magnetic field at right angles to the field lines. What will be the ratio of the radii of curvature of their trajectories? 1

3. A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the principal maximum in the resulting diffraction pattern depend on the width of the slit? 1

4. Name the device which shows the variation of current (I) with voltage (V) as shown:

Also mention any one application of the device. 1

5. What is the mathematical relation between speed of electromagnetic waves, permittivity and permeability in vacuum? 1

6. Hertz observed, during the experiment to produce e.m.waves, an ‘enhancement’ in the sparks across the detector loop when the emitter plate was illuminated by U.V radiations. What was it due to? 1

7. Define ‘trans-conductance’ of a transistor. 1

8. When current in a coil changes with time, how is the back emf induced in the coil related to it? 1

9. A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. Determine:
(a) modulation index, (b) the side bands produced. 2
10. Derive an expression for the potential at the point on the axial line of an electric dipole. 2

11. A household circuit has a fuse of 5A rating. Calculate the number of bulbs of rating 60W-220V each which can be connected in this circuit. 2

12. The deviations from Ohm’s law can be, when the relation between V and I (i) depends on the sign of V or (ii) is not unique. Give an example for each and draw the respective graphs. 2

13. On the same axes, draw the plots showing the variation of intensity of magnetization with the applied magnetic field for dia, para and ferro magnetic substances and label them as D, P and F respectively. How does diamagnetism vary with temperature? 2

14. Draw the logic symbol and truth table of NOR gate. How can a combination of such gate be used to make AND gate? 2

15. A screen is placed 80cm from an object. The image of the object on the screen is formed by a convex lens at two different locations, separated by 10cm. Calculate the focal length of the lens used. 2
(OR)

A microscope is focused on a dot at the bottom of a beaker. Some oil is poured into the
beaker to a height of ‘? ’ cm and it is found necessary to raise microscope through a vertical
distance of ‘?’ cm to bring the dot again into focus. Express refractive index of oil in terms of
‘?’ and ‘?’. 2

16. A rectangular coil of N turns and area A is rotated in a uniform magnetic field of intensity B with an angular velocity ?. Obtain an expression for the maximum induced emf in the coil. What would be flux linked with the coil at the instant when the induced emf is maximum? 2
17. Electromagnetic waves with wave length
(i) ?1 are used to kill germs in water purifiers.
(ii) ?2 are used in aircraft navigation.
(iii) ?3 are referred to as ‘heat waves.
Identify the waves and arrange them in ascending order of their magnitudes. 2
18. A bar magnet is dropped so that it falls vertically through the coil C. The graph obtained for voltage produced across the coil Vs time is shown in the figure below.
(i) Explain the graph.
(ii) Why is the negative peak longer than the positive peak?

Page 2 of 4

19. (a) Light, from a sodium lamp, is passed through two Polaroid sheets P1 and P2 kept one after the other. Keeping P1 fixed, P2 is rotated so that its ‘pass-axis’ can be at different angles, ?, with respect to the pass-axis of P1.
An experimentalist records the following data for the intensity of light coming out of P2 as a function of the angle ?.

Sl. No. 1 2 3 4 5
? (Angle between the pass-axis of the two polaroids) 0o 30o 45o 60o 90o
I (Intensity of light coming out of P2) I I
½ I ¼ I 0
One of these observations is not in agreement with the expected theoretical variation of I with ?. Identify this observation and write the correct expression.
(b) Define Brewster angle and obtain the relation connecting this angle and refractive index. 3

20. (i) Show mathematically, an amplitude modulated signal contains the frequencies ?c, ?c+?m
and ?c - ?m, where the symbols have their usual meanings.
(ii) Draw the block diagram to illustrate the process of amplitude modulation. 3

21. Define ‘power of a lens’. Plot the graph showing the variation of power of a lens with the wavelength of the incident light. Prove that the equivalent power of the combination of two thin lenses in contact is the sum of their individual powers. 3

22. A resistor of 200 O and a capacitor of 15.0 µF are connected in series to a 220 V, 50 Hz ac source. (a) Calculate the current in the circuit; (b) Calculate the voltage (rms) across the
resistor and the capacitor. Is the algebraic sum of these voltages more than the source voltage? If yes, resolve the paradox. 3
23. What are ‘matter waves’? With the help of a labeled diagram, describe an experiment to demonstrate the existence of matter waves. 3

24. Two cells of the same emf E, but different internal resistance rl and r2 are connected to an external resistance R as shown. in the figure. The voltmeter V reads zero. Obtain an expression for R in terms of rl and r2. Calculate the voltage across the cell of internal resistance r2. (Assume that the voltmeter V is of infinite resistance).
3

25. State the postulates of Bohr Atom model. Verify the second postulate using de-Broglie’s concept of matter waves. 3

26. How long can an electric lamp of 100W be kept glowing by fusion of 2.0 kg of deuterium? Take the fusion reaction as

1H2 + 1H2 ? 2He4 + n + 3.27 MeV 3
(OR)
Calculate the binding energy per nucleon of 20Ca40 nucleus. Given: m (20Ca40) = 39.962589u
Mass of a neutron = 1.008665u and mass of a proton = 1.007825u. 1u = 931MeV 3

27. Explain the terms: ‘Saturation state’ and ‘cut-off state’ of a transistor. Draw the circuit diagram, showing the use of transistor as a switch. 3

28. (i) State Gauss’ theorem. On the basis of this, prove that, for a point outside a charged
spherical shell, it behaves as a point charge.
(ii) The electric field components in figure are Ex = ax1/2, Ey = Ez = 0, in which a = 800 N/C
m1/2. Calculate (a) the flux through the cube, and (b) the charge within the cube. Assume
that a = 0.1 m.

5
(OR)

(i) Explain the principle on which Van de Graff generator operates. Draw a labeled schematic sketch and write briefly its working.
(ii) A Van de Graff generator is capable of building up a potential difference of 15 x 106 V. The dielectric strength of the gas surrounding the electrode is 5 x 107 V/m. What is the minimum radius of the shell spherical shell required?
5
29. A straight thick long wire of uniform cross section of radius ‘a’ is carrying a steady current I. Use Ampere’s circuital law to obtain a relation showing the variation of the magnetic field inside and outside the wire with distance r, (r ? a) and (r > a) of the field point from the centre of its cross section. Plot the graph showing the nature of this variation.
Calculate the ratio of magnetic field at a point a/2 above the surface of the wire to that at a point a/2 below its surface. What is the maximum value of the field of this wire? 5

(OR)

(i) Draw the labeled diagram of a moving coil galvanometer. Prove that in a radial magnetic field, the deflection of the coil is directly proportional to the current flowing in the coil.
(ii) Which one of the two – an ammeter or a milli-ammeter, has greater resistance, when made from identical galvanometers? Explain. 5

30. (a) How is a ‘wavefront’ defined? Using Huygen’s construction draw a figure showing the
propagation of a plane wavefront refracting at a plane surface separating two media.
Hence verify Snell’s law of refraction.
(b) Can two wavefronts cross each other? Explain. 5

(OR)

(a)With the help of a labeled diagram, show the image formation by a compound
microscope. Derive an expression for its magnifying power.
(b) How does the resolving power of a compound microscope get affected on
(i) decreasing the diameter of its objective?
(ii) increasing the focal length of its objective? 5

2009 CBSE Sample Paper – 2009 Class – XII Subject – Physics Question paper

2009 CBSE Sample Paper – 2009 Class – XII Subject – Physics Question paper

Sample Paper – 2009
Class – XII
Subject – Physics

1. Two point charges q1 and q2 are placed close to each other. What is the nature of the force between them when: (i) q1q2 <>0? 1

2. An electron an a proton, having equal momenta, enter a uniform magnetic field at right angles to the field lines. What will be the ratio of the radii of curvature of their trajectories? 1

3. A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the principal maximum in the resulting diffraction pattern depend on the width of the slit? 1

4. Name the device which shows the variation of current (I) with voltage (V) as shown:

Also mention any one application of the device. 1

5. What is the mathematical relation between speed of electromagnetic waves, permittivity and permeability in vacuum? 1

6. Hertz observed, during the experiment to produce e.m.waves, an ‘enhancement’ in the sparks across the detector loop when the emitter plate was illuminated by U.V radiations. What was it due to? 1

7. Define ‘trans-conductance’ of a transistor. 1

8. When current in a coil changes with time, how is the back emf induced in the coil related to it? 1

9. A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. Determine:
(a) modulation index, (b) the side bands produced. 2
10. Derive an expression for the potential at the point on the axial line of an electric dipole. 2

11. A household circuit has a fuse of 5A rating. Calculate the number of bulbs of rating 60W-220V each which can be connected in this circuit. 2

12. The deviations from Ohm’s law can be, when the relation between V and I (i) depends on the sign of V or (ii) is not unique. Give an example for each and draw the respective graphs. 2

13. On the same axes, draw the plots showing the variation of intensity of magnetization with the applied magnetic field for dia, para and ferro magnetic substances and label them as D, P and F respectively. How does diamagnetism vary with temperature? 2

14. Draw the logic symbol and truth table of NOR gate. How can a combination of such gate be used to make AND gate? 2

15. A screen is placed 80cm from an object. The image of the object on the screen is formed by a convex lens at two different locations, separated by 10cm. Calculate the focal length of the lens used. 2
(OR)

A microscope is focused on a dot at the bottom of a beaker. Some oil is poured into the
beaker to a height of ‘? ’ cm and it is found necessary to raise microscope through a vertical
distance of ‘?’ cm to bring the dot again into focus. Express refractive index of oil in terms of
‘?’ and ‘?’. 2

16. A rectangular coil of N turns and area A is rotated in a uniform magnetic field of intensity B with an angular velocity ?. Obtain an expression for the maximum induced emf in the coil. What would be flux linked with the coil at the instant when the induced emf is maximum? 2
17. Electromagnetic waves with wave length
(i) ?1 are used to kill germs in water purifiers.
(ii) ?2 are used in aircraft navigation.
(iii) ?3 are referred to as ‘heat waves.
Identify the waves and arrange them in ascending order of their magnitudes. 2
18. A bar magnet is dropped so that it falls vertically through the coil C. The graph obtained for voltage produced across the coil Vs time is shown in the figure below.
(i) Explain the graph.
(ii) Why is the negative peak longer than the positive peak?

19. (a) Light, from a sodium lamp, is passed through two Polaroid sheets P1 and P2 kept one after the other. Keeping P1 fixed, P2 is rotated so that its ‘pass-axis’ can be at different angles, ?, with respect to the pass-axis of P1.
An experimentalist records the following data for the intensity of light coming out of P2 as a function of the angle ?.

Sl. No. 1 2 3 4 5
? (Angle between the pass-axis of the two polaroids) 0o 30o 45o 60o 90o
I (Intensity of light coming out of P2) I I
½ I ¼ I 0
One of these observations is not in agreement with the expected theoretical variation of I with ?. Identify this observation and write the correct expression.
(b) Define Brewster angle and obtain the relation connecting this angle and refractive index. 3

20. (i) Show mathematically, an amplitude modulated signal contains the frequencies ?c, ?c+?m
and ?c - ?m, where the symbols have their usual meanings.
(ii) Draw the block diagram to illustrate the process of amplitude modulation. 3

21. Define ‘power of a lens’. Plot the graph showing the variation of power of a lens with the wavelength of the incident light. Prove that the equivalent power of the combination of two thin lenses in contact is the sum of their individual powers. 3

22. A resistor of 200 O and a capacitor of 15.0 µF are connected in series to a 220 V, 50 Hz ac source. (a) Calculate the current in the circuit; (b) Calculate the voltage (rms) across the
resistor and the capacitor. Is the algebraic sum of these voltages more than the source voltage? If yes, resolve the paradox. 3

23. What are ‘matter waves’? With the help of a labeled diagram, describe an experiment to demonstrate the existence of matter waves. 3

24. Two cells of the same emf E, but different internal resistance rl and r2 are connected to an external resistance R as shown. in the figure. The voltmeter V reads zero. Obtain an expression for R in terms of rl and r2. Calculate the voltage across the cell of internal resistance r2. (Assume that the voltmeter V is of infinite resistance).
3

25. State the postulates of Bohr Atom model. Verify the second postulate using de-Broglie’s concept of matter waves. 3

26. How long can an electric lamp of 100W be kept glowing by fusion of 2.0 kg of deuterium? Take the fusion reaction as

1H2 + 1H2 ? 2He4 + n + 3.27 MeV 3
(OR)
Calculate the binding energy per nucleon of 20Ca40 nucleus. Given: m (20Ca40) = 39.962589u
Mass of a neutron = 1.008665u and mass of a proton = 1.007825u. 1u = 931MeV 3

27. Explain the terms: ‘Saturation state’ and ‘cut-off state’ of a transistor. Draw the circuit diagram, showing the use of transistor as a switch. 3

28. (i) State Gauss’ theorem. On the basis of this, prove that, for a point outside a charged
spherical shell, it behaves as a point charge.
(ii) The electric field components in figure are Ex = ax1/2, Ey = Ez = 0, in which a = 800 N/C
m1/2. Calculate (a) the flux through the cube, and (b) the charge within the cube. Assume
that a = 0.1 m.

5
(OR)

(iii) Explain the principle on which Van de Graff generator operates. Draw a labeled schematic sketch and write briefly its working.
(iv) A Van de Graff generator is capable of building up a potential difference of 15 x 106 V. The dielectric strength of the gas surrounding the electrode is 5 x 107 V/m. What is the minimum radius of the shell spherical shell required?
5
29. A straight thick long wire of uniform cross section of radius ‘a’ is carrying a steady current I. Use Ampere’s circuital law to obtain a relation showing the variation of the magnetic field inside and outside the wire with distance r, (r ? a) and (r > a) of the field point from the centre of its cross section. Plot the graph showing the nature of this variation.
Calculate the ratio of magnetic field at a point a/2 above the surface of the wire to that at a point a/2 below its surface. What is the maximum value of the field of this wire? 5

(OR)

(iii) Draw the labeled diagram of a moving coil galvanometer. Prove that in a radial magnetic field, the deflection of the coil is directly proportional to the current flowing in the coil.
(iv) Which one of the two – an ammeter or a milli-ammeter, has greater resistance, when made from identical galvanometers? Explain. 5

30. (a) How is a ‘wavefront’ defined? Using Huygen’s construction draw a figure showing the
propagation of a plane wavefront refracting at a plane surface separating two media.
Hence verify Snell’s law of refraction.
(b) Can two wavefronts cross each other? Explain. 5

(OR)

(a)With the help of a labeled diagram, show the image formation by a compound
microscope. Derive an expression for its magnifying power.
(b) How does the resolving power of a compound microscope get affected on
(i) decreasing the diameter of its objective?
(ii) increasing the focal length of its objective?

2010 CBSE Sample Paper – 2010 Class – XII Subject – Physics Question paper

2010 CBSE Sample Paper – 2010 Class – XII Subject – Physics Question paper
Sample Paper – 2010
Class – XII
Subject – Physics

1. Two point charges q1 and q2 are placed close to each other. What is the nature of the force between them when: (i) q1q2 <>0? 1

2. An electron an a proton, having equal momenta, enter a uniform magnetic field at right angles to the field lines. What will be the ratio of the radii of curvature of their trajectories? 1

3. A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the principal maximum in the resulting diffraction pattern depend on the width of the slit? 1

4. Name the device which shows the variation of current (I) with voltage (V) as shown:

Also mention any one application of the device. 1

5. What is the mathematical relation between speed of electromagnetic waves, permittivity and permeability in vacuum? 1

6. Hertz observed, during the experiment to produce e.m.waves, an ‘enhancement’ in the sparks across the detector loop when the emitter plate was illuminated by U.V radiations. What was it due to? 1

7. Define ‘trans-conductance’ of a transistor. 1

8. When current in a coil changes with time, how is the back emf induced in the coil related to it? 1

9. A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. Determine:
(a) modulation index, (b) the side bands produced. 2
10. Derive an expression for the potential at the point on the axial line of an electric dipole. 2

11. A household circuit has a fuse of 5A rating. Calculate the number of bulbs of rating 60W-220V each which can be connected in this circuit. 2

12. The deviations from Ohm’s law can be, when the relation between V and I (i) depends on the sign of V or (ii) is not unique. Give an example for each and draw the respective graphs. 2

13. On the same axes, draw the plots showing the variation of intensity of magnetization with the applied magnetic field for dia, para and ferro magnetic substances and label them as D, P and F respectively. How does diamagnetism vary with temperature? 2

14. Draw the logic symbol and truth table of NOR gate. How can a combination of such gate be used to make AND gate? 2

15. A screen is placed 80cm from an object. The image of the object on the screen is formed by a convex lens at two different locations, separated by 10cm. Calculate the focal length of the lens used. 2
(OR)

A microscope is focused on a dot at the bottom of a beaker. Some oil is poured into the
beaker to a height of ‘? ’ cm and it is found necessary to raise microscope through a vertical
distance of ‘?’ cm to bring the dot again into focus. Express refractive index of oil in terms of
‘?’ and ‘?’. 2

16. A rectangular coil of N turns and area A is rotated in a uniform magnetic field of intensity B with an angular velocity ?. Obtain an expression for the maximum induced emf in the coil. What would be flux linked with the coil at the instant when the induced emf is maximum? 2
17. Electromagnetic waves with wave length
(i) ?1 are used to kill germs in water purifiers.
(ii) ?2 are used in aircraft navigation.
(iii) ?3 are referred to as ‘heat waves.
Identify the waves and arrange them in ascending order of their magnitudes. 2
18. A bar magnet is dropped so that it falls vertically through the coil C. The graph obtained for voltage produced across the coil Vs time is shown in the figure below.
(i) Explain the graph.
(ii) Why is the negative peak longer than the positive peak?

Page 2 of 4

19. (a) Light, from a sodium lamp, is passed through two Polaroid sheets P1 and P2 kept one after the other. Keeping P1 fixed, P2 is rotated so that its ‘pass-axis’ can be at different angles, ?, with respect to the pass-axis of P1.
An experimentalist records the following data for the intensity of light coming out of P2 as a function of the angle ?.

Sl. No. 1 2 3 4 5
? (Angle between the pass-axis of the two polaroids) 0o 30o 45o 60o 90o
I (Intensity of light coming out of P2) I I
½ I ¼ I 0
One of these observations is not in agreement with the expected theoretical variation of I with ?. Identify this observation and write the correct expression.
(b) Define Brewster angle and obtain the relation connecting this angle and refractive index. 3

20. (i) Show mathematically, an amplitude modulated signal contains the frequencies ?c, ?c+?m
and ?c - ?m, where the symbols have their usual meanings.
(ii) Draw the block diagram to illustrate the process of amplitude modulation. 3

21. Define ‘power of a lens’. Plot the graph showing the variation of power of a lens with the wavelength of the incident light. Prove that the equivalent power of the combination of two thin lenses in contact is the sum of their individual powers. 3

22. A resistor of 200 O and a capacitor of 15.0 µF are connected in series to a 220 V, 50 Hz ac source. (a) Calculate the current in the circuit; (b) Calculate the voltage (rms) across the
resistor and the capacitor. Is the algebraic sum of these voltages more than the source voltage? If yes, resolve the paradox. 3
23. What are ‘matter waves’? With the help of a labeled diagram, describe an experiment to demonstrate the existence of matter waves. 3

24. Two cells of the same emf E, but different internal resistance rl and r2 are connected to an external resistance R as shown. in the figure. The voltmeter V reads zero. Obtain an expression for R in terms of rl and r2. Calculate the voltage across the cell of internal resistance r2. (Assume that the voltmeter V is of infinite resistance).
3

25. State the postulates of Bohr Atom model. Verify the second postulate using de-Broglie’s concept of matter waves. 3

26. How long can an electric lamp of 100W be kept glowing by fusion of 2.0 kg of deuterium? Take the fusion reaction as

1H2 + 1H2 ? 2He4 + n + 3.27 MeV 3
(OR)
Calculate the binding energy per nucleon of 20Ca40 nucleus. Given: m (20Ca40) = 39.962589u
Mass of a neutron = 1.008665u and mass of a proton = 1.007825u. 1u = 931MeV 3

27. Explain the terms: ‘Saturation state’ and ‘cut-off state’ of a transistor. Draw the circuit diagram, showing the use of transistor as a switch. 3

28. (i) State Gauss’ theorem. On the basis of this, prove that, for a point outside a charged
spherical shell, it behaves as a point charge.
(ii) The electric field components in figure are Ex = ax1/2, Ey = Ez = 0, in which a = 800 N/C
m1/2. Calculate (a) the flux through the cube, and (b) the charge within the cube. Assume
that a = 0.1 m.

5
(OR)

(i) Explain the principle on which Van de Graff generator operates. Draw a labeled schematic sketch and write briefly its working.
(ii) A Van de Graff generator is capable of building up a potential difference of 15 x 106 V. The dielectric strength of the gas surrounding the electrode is 5 x 107 V/m. What is the minimum radius of the shell spherical shell required?
5
29. A straight thick long wire of uniform cross section of radius ‘a’ is carrying a steady current I. Use Ampere’s circuital law to obtain a relation showing the variation of the magnetic field inside and outside the wire with distance r, (r ? a) and (r > a) of the field point from the centre of its cross section. Plot the graph showing the nature of this variation.
Calculate the ratio of magnetic field at a point a/2 above the surface of the wire to that at a point a/2 below its surface. What is the maximum value of the field of this wire? 5

(OR)

(i) Draw the labeled diagram of a moving coil galvanometer. Prove that in a radial magnetic field, the deflection of the coil is directly proportional to the current flowing in the coil.
(ii) Which one of the two – an ammeter or a milli-ammeter, has greater resistance, when made from identical galvanometers? Explain. 5

30. (a) How is a ‘wavefront’ defined? Using Huygen’s construction draw a figure showing the
propagation of a plane wavefront refracting at a plane surface separating two media.
Hence verify Snell’s law of refraction.
(b) Can two wavefronts cross each other? Explain. 5

(OR)

(a)With the help of a labeled diagram, show the image formation by a compound
microscope. Derive an expression for its magnifying power.
(b) How does the resolving power of a compound microscope get affected on
(i) decreasing the diameter of its objective?
(ii) increasing the focal length of its objective? 5

2009 CBSE Sample Paper – 2009 Class – XII Subject – Physics Question paper

2009 CBSE Sample Paper – 2009 Class – XII Subject – Physics Question paper

Sample Paper – 2009
Class – XII
Subject – Physics

1. Two point charges q1 and q2 are placed close to each other. What is the nature of the force between them when: (i) q1q2 <>0? 1

2. An electron an a proton, having equal momenta, enter a uniform magnetic field at right angles to the field lines. What will be the ratio of the radii of curvature of their trajectories? 1

3. A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the principal maximum in the resulting diffraction pattern depend on the width of the slit? 1

4. Name the device which shows the variation of current (I) with voltage (V) as shown:

Also mention any one application of the device. 1

5. What is the mathematical relation between speed of electromagnetic waves, permittivity and permeability in vacuum? 1

6. Hertz observed, during the experiment to produce e.m.waves, an ‘enhancement’ in the sparks across the detector loop when the emitter plate was illuminated by U.V radiations. What was it due to? 1

7. Define ‘trans-conductance’ of a transistor. 1

8. When current in a coil changes with time, how is the back emf induced in the coil related to it? 1

9. A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. Determine:
(a) modulation index, (b) the side bands produced. 2
10. Derive an expression for the potential at the point on the axial line of an electric dipole. 2

11. A household circuit has a fuse of 5A rating. Calculate the number of bulbs of rating 60W-220V each which can be connected in this circuit. 2

12. The deviations from Ohm’s law can be, when the relation between V and I (i) depends on the sign of V or (ii) is not unique. Give an example for each and draw the respective graphs. 2

13. On the same axes, draw the plots showing the variation of intensity of magnetization with the applied magnetic field for dia, para and ferro magnetic substances and label them as D, P and F respectively. How does diamagnetism vary with temperature? 2

14. Draw the logic symbol and truth table of NOR gate. How can a combination of such gate be used to make AND gate? 2

15. A screen is placed 80cm from an object. The image of the object on the screen is formed by a convex lens at two different locations, separated by 10cm. Calculate the focal length of the lens used. 2
(OR)

A microscope is focused on a dot at the bottom of a beaker. Some oil is poured into the
beaker to a height of ‘? ’ cm and it is found necessary to raise microscope through a vertical
distance of ‘?’ cm to bring the dot again into focus. Express refractive index of oil in terms of
‘?’ and ‘?’. 2

16. A rectangular coil of N turns and area A is rotated in a uniform magnetic field of intensity B with an angular velocity ?. Obtain an expression for the maximum induced emf in the coil. What would be flux linked with the coil at the instant when the induced emf is maximum? 2
17. Electromagnetic waves with wave length
(i) ?1 are used to kill germs in water purifiers.
(ii) ?2 are used in aircraft navigation.
(iii) ?3 are referred to as ‘heat waves.
Identify the waves and arrange them in ascending order of their magnitudes. 2
18. A bar magnet is dropped so that it falls vertically through the coil C. The graph obtained for voltage produced across the coil Vs time is shown in the figure below.
(i) Explain the graph.
(ii) Why is the negative peak longer than the positive peak?

19. (a) Light, from a sodium lamp, is passed through two Polaroid sheets P1 and P2 kept one after the other. Keeping P1 fixed, P2 is rotated so that its ‘pass-axis’ can be at different angles, ?, with respect to the pass-axis of P1.
An experimentalist records the following data for the intensity of light coming out of P2 as a function of the angle ?.

Sl. No. 1 2 3 4 5
? (Angle between the pass-axis of the two polaroids) 0o 30o 45o 60o 90o
I (Intensity of light coming out of P2) I I
½ I ¼ I 0
One of these observations is not in agreement with the expected theoretical variation of I with ?. Identify this observation and write the correct expression.
(b) Define Brewster angle and obtain the relation connecting this angle and refractive index. 3

20. (i) Show mathematically, an amplitude modulated signal contains the frequencies ?c, ?c+?m
and ?c - ?m, where the symbols have their usual meanings.
(ii) Draw the block diagram to illustrate the process of amplitude modulation. 3

21. Define ‘power of a lens’. Plot the graph showing the variation of power of a lens with the wavelength of the incident light. Prove that the equivalent power of the combination of two thin lenses in contact is the sum of their individual powers. 3

22. A resistor of 200 O and a capacitor of 15.0 µF are connected in series to a 220 V, 50 Hz ac source. (a) Calculate the current in the circuit; (b) Calculate the voltage (rms) across the
resistor and the capacitor. Is the algebraic sum of these voltages more than the source voltage? If yes, resolve the paradox. 3

23. What are ‘matter waves’? With the help of a labeled diagram, describe an experiment to demonstrate the existence of matter waves. 3

24. Two cells of the same emf E, but different internal resistance rl and r2 are connected to an external resistance R as shown. in the figure. The voltmeter V reads zero. Obtain an expression for R in terms of rl and r2. Calculate the voltage across the cell of internal resistance r2. (Assume that the voltmeter V is of infinite resistance).
3

25. State the postulates of Bohr Atom model. Verify the second postulate using de-Broglie’s concept of matter waves. 3

26. How long can an electric lamp of 100W be kept glowing by fusion of 2.0 kg of deuterium? Take the fusion reaction as

1H2 + 1H2 ? 2He4 + n + 3.27 MeV 3
(OR)
Calculate the binding energy per nucleon of 20Ca40 nucleus. Given: m (20Ca40) = 39.962589u
Mass of a neutron = 1.008665u and mass of a proton = 1.007825u. 1u = 931MeV 3

27. Explain the terms: ‘Saturation state’ and ‘cut-off state’ of a transistor. Draw the circuit diagram, showing the use of transistor as a switch. 3

28. (i) State Gauss’ theorem. On the basis of this, prove that, for a point outside a charged
spherical shell, it behaves as a point charge.
(ii) The electric field components in figure are Ex = ax1/2, Ey = Ez = 0, in which a = 800 N/C
m1/2. Calculate (a) the flux through the cube, and (b) the charge within the cube. Assume
that a = 0.1 m.

5
(OR)

(iii) Explain the principle on which Van de Graff generator operates. Draw a labeled schematic sketch and write briefly its working.
(iv) A Van de Graff generator is capable of building up a potential difference of 15 x 106 V. The dielectric strength of the gas surrounding the electrode is 5 x 107 V/m. What is the minimum radius of the shell spherical shell required?
5
29. A straight thick long wire of uniform cross section of radius ‘a’ is carrying a steady current I. Use Ampere’s circuital law to obtain a relation showing the variation of the magnetic field inside and outside the wire with distance r, (r ? a) and (r > a) of the field point from the centre of its cross section. Plot the graph showing the nature of this variation.
Calculate the ratio of magnetic field at a point a/2 above the surface of the wire to that at a point a/2 below its surface. What is the maximum value of the field of this wire? 5

(OR)

(iii) Draw the labeled diagram of a moving coil galvanometer. Prove that in a radial magnetic field, the deflection of the coil is directly proportional to the current flowing in the coil.
(iv) Which one of the two – an ammeter or a milli-ammeter, has greater resistance, when made from identical galvanometers? Explain. 5

30. (a) How is a ‘wavefront’ defined? Using Huygen’s construction draw a figure showing the
propagation of a plane wavefront refracting at a plane surface separating two media.
Hence verify Snell’s law of refraction.
(b) Can two wavefronts cross each other? Explain. 5

(OR)

(a)With the help of a labeled diagram, show the image formation by a compound
microscope. Derive an expression for its magnifying power.
(b) How does the resolving power of a compound microscope get affected on
(i) decreasing the diameter of its objective?
(ii) increasing the focal length of its objective?

2010 Computer Science Class - XII Set - I CBSE Question paper

2010 Computer Science Class - XII Set - I CBSE Question paper
Computer science
Class: XII (SET – I)

Time Duration: 3 Hours Maximum Marks : 70

Instructions:
(i) All Questions are Compulsory.
(ii) Programming Language : C++
----------------------------------------------------------------------------------------------------

1.(a) Distinguish between an object and a class.
(b) How does a pointer variable differ from a simple variable?
(c) What is an inline function? Specify the conditions when you can not create inline
function?
(d) What are the advantages offered by inheritance?
(e) What is a parameter? Differentiate between an actual and a formal parameter with an
example? (2 X 5 = 10)

2. (a) Write the names of the header files to which the following belong :
(i) gets() (ii) remove() (iii) abs() (iv) isupper()

(b) What will be the output of the following program :
#include
#include
#include
#include
void changestring(char text[], int &counter)
{
char *ptr = text;
int length=strlen(text);
for(;counter
{
*(ptr+counter) = toupper(*(ptr+counter));
}
}
void main()
{
clrscr();
int position = 0;
char message[]=”Mouse Fun”;
changestring(Message,position);
cout<<<” @ “<
}

(c). What will be the output of the following program :
#include
void main()
{
int var1=5,var2=10;
for(int i=1;i<=2;i++)
{
cout<<<”\t”<<--var2<
cout<<<”\t”<<++var1<
}
}

(d) Write definition for a function SUMSEQUENCE() in C++ with two arguments/parameters – double x and int n. The function should return a value of type double and it should perform sum of the following series :
1/x – 3!/x2 + 5!/x3 – 7!/x4 + 9!/x5 - …………………. Up to n terms.
(Note : The symbol ! represents Factorial of a number i.e. 5! = 5*4*3*2*1)
2
(e) Write a C++ function that converts a decimal number to the hexadecimal number.
2

3.
(a) Define the following terms : (i) Candidate Key (ii) Alternate Key 2
(b) Differentiate between DDL and DML 1
(c) What is relational data model? 1
(d) What are views? How are they useful? 1

TABLE : EMP
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7839 REA MANAGER 67 12-DEC-98 5000 0 10
1234 PREM CLERK 87 11-FEB-77 12000 1500 20
6754 SITA MANAGER 89 12-MAR-99 10000 1000 20
6574 GITA SALESMAN 98 11-JUN-99 9000 0 30
9876 HONEY CLERK 65 12-JUN-00 12000 800 20
8976 REEMA SALESMAN 91 10-SEP-88 6000 100 30

(e) Display names of employees whose names include either of the substring “TH” or “LL”.
(f) Display data of all employees sorted by their department, seniority and salary.
(g) Find all the employees who have no manager.
(h) To display all employees who were hired during 1995.
(i) Show the average salary for all departments with more than 3 people for a job.
(j) Find out number of employees having ‘MANAGER’ as job.
(k) Create view DEPT20 with name and the salary of employees for dept 20.
(l) Display department no. and number of employees in each department.
(m) Find the output of the following :
1. SELECT SYSDATE FROM DUAL;
2. SELECT ENAME,SAL FROM EMPLOYEE WHERE DEPTNO=20;
3. SELECT COUNT(*) FROM EMP;
4. SELECT AVG(SAL) FROM EMP; 10

4.
1. By means of truth table, demonstrate the validity of the following Postulates/Laws of
Boolean Algebra.
(a) The Distributive Law
(b) Absorption Law 2
2. State and prove the De Morgan’s Theoram (Any One) Algebraically. 2
3. Obtain a simplified form for the following Boolean Expression using K – Map: F(u,v,w,z) = ?(0,3,4,5,7,11,13,15) 2
4. Obtain a simplified form for a Boolean expression : F(X,Y,Z,W) = ?(0,1,3,5,6,7,10,14,15) 2
5. Design a circuit to realize the following : F(A,B,C) = AB + AC’ + B’A’C 2
6. Show A(B’+C) using NOR gate only. 2
7. Reduce X’Y’Z’ + X’YZ’+XY’Z’ + XYZ’ = Z’ 2
8. Write dual of the following Boolean Expression (x+y’+z)(x+y) 1

5. (a) Define a class in C++ with the following description :
• A data member Flight Number of type integer.
• A data member Destination of type string
• A data member Distance of type float
• A data member Fuel of type float
A member function CALFUEL() to calculate the value of Fuel as per the following criteria :
Distance Fuel
<=1000 500
more than 1000 and <=2000 1100
more than 2000 2200
Public Members
• A function FEEDINFO( ) to allow user to enter values for the Flight Number, Destination, Distance & call function CALFUEL() to calculate the quantity of Fuel.
• A function SHOWINFO( ) to allow user to view the content of all the data members.

(b) Define a class Test in C++ with the following description :
Private Members
(i) Test Code of type integer
(ii) Description of type string
(iii) Noofcandidate of type integer
(iv) Centerreqd (number of centers required) of type integer
(v) A member function CALCNTR( ) to calculate and return the number of centers as (NOOFCANDIDATES /100+1)
Public Members
? A function SCHEDULE() to allow user to enter values for Test Code, Description, Noofcandidates & call function CALCNTR( ) to calculate the number of canters.
? A function DISPTEST( ) to allow user to view the content of all the data members.

6.
class PUBLISHER
{
char pub[12];
double turnover;
protected:
void register( );
public:
PUBLISHER( );
void enter( );
void display( );
};
class BRANCH
{
char city[20];
protected:
float employees;
public:
BRANCH( );
void haveit( );
void giveit( );
};
class AUTHOR: private BRANCH, public PUBLISHER
{
int acode;
char aname[20];
float amount;
public:
AUTHOR( );
void start( );
void show( );
};

(i) Write the names of data members. Which are accessible from objects belonging to class AUTHOR.
(ii) Write the names of all the members functions which are accessible from objects belonging to class BRANCH.
(iii) Write the names of all the members which are accessible from members functions of class AUTHOR.
(iv) How many bytes will be required by an object belonging to class ATHOR?
(v) Write the public members of the class AUTHOR