Science Past Year Paper SA-2(Set -1) - 2014, Class 10, CBSE Class 10 Notes | EduRev

Science Class 10

Created by: Manju Sen

Class 10 : Science Past Year Paper SA-2(Set -1) - 2014, Class 10, CBSE Class 10 Notes | EduRev

 Page 1


 
 
 
 
Annual Examination 2014-2015 
Science 
Class – X 
Set -31/1 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) The question paper comprises of two sections, A and B. You are to attempt both sections. 
b) All questions are compulsory. 
c) All questions of section – A and all questions of section – B are to be attempted 
separately. 
d) Question numbers 1 to 3 in Section – A are 1 marks questions. These are to be answered 
in one word or in one sentence 
e) Question numbers 4 to 6 Section – A are 2 marks questions. These are to be answered in 
about 30 words each. 
f) Question numbers 7 to 18 in Section – A are 3 marks questions. These are to answered in 
about 50 words each. 
g) Question numbers 19 to 24 in Section – A are 5 marks questions. These are to be 
answered in about 70 words each. 
h) Question number 25 to 33 in Section – B are V.S.A questions and each question carry one 
mark based on practical skills. Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are two marks questions based on practical 
skills are two marks questions. 
 
 
Section – A 
1. Write the number of covalent bonds in the molecule of ethane. 
2. Name the life process of an organism that helps in the growth of its population. 
3. What will be the amount of energy available to the organisms of the 2
nd
 trophic level of a 
food chain, if the energy available at the first trophic level is 10,000 joules? 
4. The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed 
of the light in glass is 
8
2 10 / m s × , calculate the speed of light in  
i. Vacuum 
ii. Water 
5. List two main causes of the pollution of water of the river Ganga. State how population and 
contamination of river water prove harmful for the health of the people of neighbouring 
areas. 
6. What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention 
one effect of it. 
7. List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and 
describe how does these tests are performed. 
Page 2


 
 
 
 
Annual Examination 2014-2015 
Science 
Class – X 
Set -31/1 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) The question paper comprises of two sections, A and B. You are to attempt both sections. 
b) All questions are compulsory. 
c) All questions of section – A and all questions of section – B are to be attempted 
separately. 
d) Question numbers 1 to 3 in Section – A are 1 marks questions. These are to be answered 
in one word or in one sentence 
e) Question numbers 4 to 6 Section – A are 2 marks questions. These are to be answered in 
about 30 words each. 
f) Question numbers 7 to 18 in Section – A are 3 marks questions. These are to answered in 
about 50 words each. 
g) Question numbers 19 to 24 in Section – A are 5 marks questions. These are to be 
answered in about 70 words each. 
h) Question number 25 to 33 in Section – B are V.S.A questions and each question carry one 
mark based on practical skills. Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are two marks questions based on practical 
skills are two marks questions. 
 
 
Section – A 
1. Write the number of covalent bonds in the molecule of ethane. 
2. Name the life process of an organism that helps in the growth of its population. 
3. What will be the amount of energy available to the organisms of the 2
nd
 trophic level of a 
food chain, if the energy available at the first trophic level is 10,000 joules? 
4. The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed 
of the light in glass is 
8
2 10 / m s × , calculate the speed of light in  
i. Vacuum 
ii. Water 
5. List two main causes of the pollution of water of the river Ganga. State how population and 
contamination of river water prove harmful for the health of the people of neighbouring 
areas. 
6. What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention 
one effect of it. 
7. List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and 
describe how does these tests are performed. 
 
 
 
 
8. Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for 
welding. In your opinion, why cannot we use a mixture of ethyne and air for this purpose? 
9. Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in 
Group-1 and Group-2 respectively. Compare following characteristics in tabular form: 
a) The number of electrons in their atoms 
b) The sizes of their atoms 
c) Their metallic characters 
d) Their tendencies to lose electrons 
e) The formula of their oxides 
f) The formula of their chlorides 
10. Taking the example of an element of atomic number 16, explain how the electronic 
configuration of the atom of an element relates to its position in the modern periodic table 
and how valency of an element is calculated on the basis of its atomic number. 
11. List six specific characteristics of sexual reproduction. 
12. What are chromosomes? Explain how in sexually reproducing organisms the number of 
chromosomes in the progeny is maintained. 
13. List four point of significance of reproductive health in a society. Name any two areas related 
to reproductive health which have improved over the past 50 years in our country. 
14. Explain with an example for each, how the following provides evidence in favour of evolution 
in organisms: 
a) Homologous organs 
b) Analogous organs 
c) Fossils 
15. Explain the following: 
a) Speciation 
b) Natural selection 
16. If the image formed by a mirror for all positions of the object placed in front of it is always 
erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. 
Where and why do we generally use this type of mirror? 
17. What is meant by scattering of light? Use this phenomenon to explain why the clear sky 
appears blue or the sun appears reddish at sunrise. 
18. Differentiate between biodegradable and non-biodegradable substances with the help of one 
example each. List two changes in habit that people must adopt to dispose non-
biodegradable waste, for saving the environment. 
19. Both soap and detergent are some type of salts. What is the difference between them? 
Describe in brief the cleansing action of soap. Why do soap not form lather in hard water? 
List two problems that arise due to the use of detergents instead of soaps. 
20.   
a) Name the human male reproductive organ that produces sperms and also secretes a 
hormone. Write the functions of the secreted hormone. 
b) Name the parts of the human female reproductive system where  
Page 3


 
 
 
 
Annual Examination 2014-2015 
Science 
Class – X 
Set -31/1 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) The question paper comprises of two sections, A and B. You are to attempt both sections. 
b) All questions are compulsory. 
c) All questions of section – A and all questions of section – B are to be attempted 
separately. 
d) Question numbers 1 to 3 in Section – A are 1 marks questions. These are to be answered 
in one word or in one sentence 
e) Question numbers 4 to 6 Section – A are 2 marks questions. These are to be answered in 
about 30 words each. 
f) Question numbers 7 to 18 in Section – A are 3 marks questions. These are to answered in 
about 50 words each. 
g) Question numbers 19 to 24 in Section – A are 5 marks questions. These are to be 
answered in about 70 words each. 
h) Question number 25 to 33 in Section – B are V.S.A questions and each question carry one 
mark based on practical skills. Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are two marks questions based on practical 
skills are two marks questions. 
 
 
Section – A 
1. Write the number of covalent bonds in the molecule of ethane. 
2. Name the life process of an organism that helps in the growth of its population. 
3. What will be the amount of energy available to the organisms of the 2
nd
 trophic level of a 
food chain, if the energy available at the first trophic level is 10,000 joules? 
4. The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed 
of the light in glass is 
8
2 10 / m s × , calculate the speed of light in  
i. Vacuum 
ii. Water 
5. List two main causes of the pollution of water of the river Ganga. State how population and 
contamination of river water prove harmful for the health of the people of neighbouring 
areas. 
6. What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention 
one effect of it. 
7. List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and 
describe how does these tests are performed. 
 
 
 
 
8. Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for 
welding. In your opinion, why cannot we use a mixture of ethyne and air for this purpose? 
9. Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in 
Group-1 and Group-2 respectively. Compare following characteristics in tabular form: 
a) The number of electrons in their atoms 
b) The sizes of their atoms 
c) Their metallic characters 
d) Their tendencies to lose electrons 
e) The formula of their oxides 
f) The formula of their chlorides 
10. Taking the example of an element of atomic number 16, explain how the electronic 
configuration of the atom of an element relates to its position in the modern periodic table 
and how valency of an element is calculated on the basis of its atomic number. 
11. List six specific characteristics of sexual reproduction. 
12. What are chromosomes? Explain how in sexually reproducing organisms the number of 
chromosomes in the progeny is maintained. 
13. List four point of significance of reproductive health in a society. Name any two areas related 
to reproductive health which have improved over the past 50 years in our country. 
14. Explain with an example for each, how the following provides evidence in favour of evolution 
in organisms: 
a) Homologous organs 
b) Analogous organs 
c) Fossils 
15. Explain the following: 
a) Speciation 
b) Natural selection 
16. If the image formed by a mirror for all positions of the object placed in front of it is always 
erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. 
Where and why do we generally use this type of mirror? 
17. What is meant by scattering of light? Use this phenomenon to explain why the clear sky 
appears blue or the sun appears reddish at sunrise. 
18. Differentiate between biodegradable and non-biodegradable substances with the help of one 
example each. List two changes in habit that people must adopt to dispose non-
biodegradable waste, for saving the environment. 
19. Both soap and detergent are some type of salts. What is the difference between them? 
Describe in brief the cleansing action of soap. Why do soap not form lather in hard water? 
List two problems that arise due to the use of detergents instead of soaps. 
20.   
a) Name the human male reproductive organ that produces sperms and also secretes a 
hormone. Write the functions of the secreted hormone. 
b) Name the parts of the human female reproductive system where  
 
 
 
 
i. Fertilization takes place, 
ii. Implantation of the fertilized egg occurs 
Explain how the embryo gets nourishment inside the mother’s body. 
21. How do Mendel’s experiments show that the 
a) Traits may be dominant or recessive, 
b) Traits are inherited independently? 
22. What is meant by power of a lens? Define its SI unit. 
You have two lenses A and B of focal lengths +10 cm and -10 cm respectively. State the 
nature and power of each lens. Which of the two lenses will form a virtual and magnified 
image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer. 
23. One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens 
produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a 
ray diagram to justify your answer. 
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 
20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of 
the image. 
24. Write the importance of ciliary muscles in the human eye. Name the defect of vision that 
arises due to gradual weakening of the ciliary muscles in old age. What type of lenses are 
required by the persons suffering from this defect to see the objects clearly? 
Akshay, sitting in the last row in his class, could not see clearly the words written on the 
blackboard. When the teacher noticed it, he announced if any student sitting in the front row 
could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange 
his seat with Akshay. He could now see the words written on the blackboard clearly. The 
teacher thought it fit to send the message to Akshay’s parents advising them to get his 
eyesight checked. 
In the context of the above event, answer the following questions: 
a) Which defect of vision is Akshay suffering from? Which type of lens is used to correct this 
defect? 
b) State the values displayed by the teacher and Salman. 
c) In your opinion, in what way can Akshay express his gratitude towards the teacher and 
Salman? 
 
Section – B 
25. What do we observe on pouring acetic acid on red and blue litmus papers? 
a) Red litmus remains red and blue litmus turns red 
b) Red litmus turns blue and blue litmus remains blue 
c) Red litmus turns blue and blue litmus turns red 
d) Red litmus becomes colourless and blue litmus remains blue 
26. While preparing soap a small quantity of common salt is general added to the reaction 
mixture of vegetable oil and sodium hydroxide. Which one of the following may be the 
purpose of the soap 
Page 4


 
 
 
 
Annual Examination 2014-2015 
Science 
Class – X 
Set -31/1 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) The question paper comprises of two sections, A and B. You are to attempt both sections. 
b) All questions are compulsory. 
c) All questions of section – A and all questions of section – B are to be attempted 
separately. 
d) Question numbers 1 to 3 in Section – A are 1 marks questions. These are to be answered 
in one word or in one sentence 
e) Question numbers 4 to 6 Section – A are 2 marks questions. These are to be answered in 
about 30 words each. 
f) Question numbers 7 to 18 in Section – A are 3 marks questions. These are to answered in 
about 50 words each. 
g) Question numbers 19 to 24 in Section – A are 5 marks questions. These are to be 
answered in about 70 words each. 
h) Question number 25 to 33 in Section – B are V.S.A questions and each question carry one 
mark based on practical skills. Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are two marks questions based on practical 
skills are two marks questions. 
 
 
Section – A 
1. Write the number of covalent bonds in the molecule of ethane. 
2. Name the life process of an organism that helps in the growth of its population. 
3. What will be the amount of energy available to the organisms of the 2
nd
 trophic level of a 
food chain, if the energy available at the first trophic level is 10,000 joules? 
4. The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed 
of the light in glass is 
8
2 10 / m s × , calculate the speed of light in  
i. Vacuum 
ii. Water 
5. List two main causes of the pollution of water of the river Ganga. State how population and 
contamination of river water prove harmful for the health of the people of neighbouring 
areas. 
6. What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention 
one effect of it. 
7. List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and 
describe how does these tests are performed. 
 
 
 
 
8. Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for 
welding. In your opinion, why cannot we use a mixture of ethyne and air for this purpose? 
9. Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in 
Group-1 and Group-2 respectively. Compare following characteristics in tabular form: 
a) The number of electrons in their atoms 
b) The sizes of their atoms 
c) Their metallic characters 
d) Their tendencies to lose electrons 
e) The formula of their oxides 
f) The formula of their chlorides 
10. Taking the example of an element of atomic number 16, explain how the electronic 
configuration of the atom of an element relates to its position in the modern periodic table 
and how valency of an element is calculated on the basis of its atomic number. 
11. List six specific characteristics of sexual reproduction. 
12. What are chromosomes? Explain how in sexually reproducing organisms the number of 
chromosomes in the progeny is maintained. 
13. List four point of significance of reproductive health in a society. Name any two areas related 
to reproductive health which have improved over the past 50 years in our country. 
14. Explain with an example for each, how the following provides evidence in favour of evolution 
in organisms: 
a) Homologous organs 
b) Analogous organs 
c) Fossils 
15. Explain the following: 
a) Speciation 
b) Natural selection 
16. If the image formed by a mirror for all positions of the object placed in front of it is always 
erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. 
Where and why do we generally use this type of mirror? 
17. What is meant by scattering of light? Use this phenomenon to explain why the clear sky 
appears blue or the sun appears reddish at sunrise. 
18. Differentiate between biodegradable and non-biodegradable substances with the help of one 
example each. List two changes in habit that people must adopt to dispose non-
biodegradable waste, for saving the environment. 
19. Both soap and detergent are some type of salts. What is the difference between them? 
Describe in brief the cleansing action of soap. Why do soap not form lather in hard water? 
List two problems that arise due to the use of detergents instead of soaps. 
20.   
a) Name the human male reproductive organ that produces sperms and also secretes a 
hormone. Write the functions of the secreted hormone. 
b) Name the parts of the human female reproductive system where  
 
 
 
 
i. Fertilization takes place, 
ii. Implantation of the fertilized egg occurs 
Explain how the embryo gets nourishment inside the mother’s body. 
21. How do Mendel’s experiments show that the 
a) Traits may be dominant or recessive, 
b) Traits are inherited independently? 
22. What is meant by power of a lens? Define its SI unit. 
You have two lenses A and B of focal lengths +10 cm and -10 cm respectively. State the 
nature and power of each lens. Which of the two lenses will form a virtual and magnified 
image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer. 
23. One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens 
produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a 
ray diagram to justify your answer. 
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 
20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of 
the image. 
24. Write the importance of ciliary muscles in the human eye. Name the defect of vision that 
arises due to gradual weakening of the ciliary muscles in old age. What type of lenses are 
required by the persons suffering from this defect to see the objects clearly? 
Akshay, sitting in the last row in his class, could not see clearly the words written on the 
blackboard. When the teacher noticed it, he announced if any student sitting in the front row 
could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange 
his seat with Akshay. He could now see the words written on the blackboard clearly. The 
teacher thought it fit to send the message to Akshay’s parents advising them to get his 
eyesight checked. 
In the context of the above event, answer the following questions: 
a) Which defect of vision is Akshay suffering from? Which type of lens is used to correct this 
defect? 
b) State the values displayed by the teacher and Salman. 
c) In your opinion, in what way can Akshay express his gratitude towards the teacher and 
Salman? 
 
Section – B 
25. What do we observe on pouring acetic acid on red and blue litmus papers? 
a) Red litmus remains red and blue litmus turns red 
b) Red litmus turns blue and blue litmus remains blue 
c) Red litmus turns blue and blue litmus turns red 
d) Red litmus becomes colourless and blue litmus remains blue 
26. While preparing soap a small quantity of common salt is general added to the reaction 
mixture of vegetable oil and sodium hydroxide. Which one of the following may be the 
purpose of the soap 
 
 
 
 
a) To reduce the basic nature of the soap 
b) To make the soap neutral 
c) To enhance the cleansing power of the soap 
d) To favour the precipitation of the soap 
27. A student takes about 4 mL of distilled water in four test tubes marked P, Q, R and S. He then 
dissolves in each test tube an equal amount of one salt in one test tube, namely sodium 
sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. 
After that the adds an equal amount of soap solution in each test tube. On shaking each of 
these test tubes well, he observes a good amount of lather (foam) in the test tubes marked 
a) P and Q 
b) Q and R 
c) P, Q and S 
d) P, R and S 
28. A student was asked to observe and identify the various parts of an embryo of red kidney 
bean seed. He identified the parts and listed them as under: 
I. Tegmen 
II. Testa 
III. Radicle 
IV. Plumule 
The correctly identified parts among these are 
a) I, II and III 
b) II, III and IV 
c) III, IV and V 
d) I, III, IV and V 
29. Given below is the list of vegetables available in the market. Select from these the two 
vegetables having homologous structures: 
Potato, sweet potato, ginger, radish, tomato, carrot, okra (Lady finger) 
a) Potato and sweet potato 
b) Radish and carrot 
c) Okra and sweet potato 
d) Potato and tomato 
30. A student obtains a sharp image of the distant window (W) of the school laboratory on the 
screen (S) using the given concave mirror (M) to determine its focal length. Which of the 
following distances should he measure to get the focal length of the mirror? 
 
a) MW 
Page 5


 
 
 
 
Annual Examination 2014-2015 
Science 
Class – X 
Set -31/1 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) The question paper comprises of two sections, A and B. You are to attempt both sections. 
b) All questions are compulsory. 
c) All questions of section – A and all questions of section – B are to be attempted 
separately. 
d) Question numbers 1 to 3 in Section – A are 1 marks questions. These are to be answered 
in one word or in one sentence 
e) Question numbers 4 to 6 Section – A are 2 marks questions. These are to be answered in 
about 30 words each. 
f) Question numbers 7 to 18 in Section – A are 3 marks questions. These are to answered in 
about 50 words each. 
g) Question numbers 19 to 24 in Section – A are 5 marks questions. These are to be 
answered in about 70 words each. 
h) Question number 25 to 33 in Section – B are V.S.A questions and each question carry one 
mark based on practical skills. Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are two marks questions based on practical 
skills are two marks questions. 
 
 
Section – A 
1. Write the number of covalent bonds in the molecule of ethane. 
2. Name the life process of an organism that helps in the growth of its population. 
3. What will be the amount of energy available to the organisms of the 2
nd
 trophic level of a 
food chain, if the energy available at the first trophic level is 10,000 joules? 
4. The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed 
of the light in glass is 
8
2 10 / m s × , calculate the speed of light in  
i. Vacuum 
ii. Water 
5. List two main causes of the pollution of water of the river Ganga. State how population and 
contamination of river water prove harmful for the health of the people of neighbouring 
areas. 
6. What is biodiversity? What will happen if biodiversity of an area is not preserved? Mention 
one effect of it. 
7. List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and 
describe how does these tests are performed. 
 
 
 
 
8. Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for 
welding. In your opinion, why cannot we use a mixture of ethyne and air for this purpose? 
9. Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in 
Group-1 and Group-2 respectively. Compare following characteristics in tabular form: 
a) The number of electrons in their atoms 
b) The sizes of their atoms 
c) Their metallic characters 
d) Their tendencies to lose electrons 
e) The formula of their oxides 
f) The formula of their chlorides 
10. Taking the example of an element of atomic number 16, explain how the electronic 
configuration of the atom of an element relates to its position in the modern periodic table 
and how valency of an element is calculated on the basis of its atomic number. 
11. List six specific characteristics of sexual reproduction. 
12. What are chromosomes? Explain how in sexually reproducing organisms the number of 
chromosomes in the progeny is maintained. 
13. List four point of significance of reproductive health in a society. Name any two areas related 
to reproductive health which have improved over the past 50 years in our country. 
14. Explain with an example for each, how the following provides evidence in favour of evolution 
in organisms: 
a) Homologous organs 
b) Analogous organs 
c) Fossils 
15. Explain the following: 
a) Speciation 
b) Natural selection 
16. If the image formed by a mirror for all positions of the object placed in front of it is always 
erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. 
Where and why do we generally use this type of mirror? 
17. What is meant by scattering of light? Use this phenomenon to explain why the clear sky 
appears blue or the sun appears reddish at sunrise. 
18. Differentiate between biodegradable and non-biodegradable substances with the help of one 
example each. List two changes in habit that people must adopt to dispose non-
biodegradable waste, for saving the environment. 
19. Both soap and detergent are some type of salts. What is the difference between them? 
Describe in brief the cleansing action of soap. Why do soap not form lather in hard water? 
List two problems that arise due to the use of detergents instead of soaps. 
20.   
a) Name the human male reproductive organ that produces sperms and also secretes a 
hormone. Write the functions of the secreted hormone. 
b) Name the parts of the human female reproductive system where  
 
 
 
 
i. Fertilization takes place, 
ii. Implantation of the fertilized egg occurs 
Explain how the embryo gets nourishment inside the mother’s body. 
21. How do Mendel’s experiments show that the 
a) Traits may be dominant or recessive, 
b) Traits are inherited independently? 
22. What is meant by power of a lens? Define its SI unit. 
You have two lenses A and B of focal lengths +10 cm and -10 cm respectively. State the 
nature and power of each lens. Which of the two lenses will form a virtual and magnified 
image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer. 
23. One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens 
produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a 
ray diagram to justify your answer. 
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 
20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of 
the image. 
24. Write the importance of ciliary muscles in the human eye. Name the defect of vision that 
arises due to gradual weakening of the ciliary muscles in old age. What type of lenses are 
required by the persons suffering from this defect to see the objects clearly? 
Akshay, sitting in the last row in his class, could not see clearly the words written on the 
blackboard. When the teacher noticed it, he announced if any student sitting in the front row 
could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange 
his seat with Akshay. He could now see the words written on the blackboard clearly. The 
teacher thought it fit to send the message to Akshay’s parents advising them to get his 
eyesight checked. 
In the context of the above event, answer the following questions: 
a) Which defect of vision is Akshay suffering from? Which type of lens is used to correct this 
defect? 
b) State the values displayed by the teacher and Salman. 
c) In your opinion, in what way can Akshay express his gratitude towards the teacher and 
Salman? 
 
Section – B 
25. What do we observe on pouring acetic acid on red and blue litmus papers? 
a) Red litmus remains red and blue litmus turns red 
b) Red litmus turns blue and blue litmus remains blue 
c) Red litmus turns blue and blue litmus turns red 
d) Red litmus becomes colourless and blue litmus remains blue 
26. While preparing soap a small quantity of common salt is general added to the reaction 
mixture of vegetable oil and sodium hydroxide. Which one of the following may be the 
purpose of the soap 
 
 
 
 
a) To reduce the basic nature of the soap 
b) To make the soap neutral 
c) To enhance the cleansing power of the soap 
d) To favour the precipitation of the soap 
27. A student takes about 4 mL of distilled water in four test tubes marked P, Q, R and S. He then 
dissolves in each test tube an equal amount of one salt in one test tube, namely sodium 
sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. 
After that the adds an equal amount of soap solution in each test tube. On shaking each of 
these test tubes well, he observes a good amount of lather (foam) in the test tubes marked 
a) P and Q 
b) Q and R 
c) P, Q and S 
d) P, R and S 
28. A student was asked to observe and identify the various parts of an embryo of red kidney 
bean seed. He identified the parts and listed them as under: 
I. Tegmen 
II. Testa 
III. Radicle 
IV. Plumule 
The correctly identified parts among these are 
a) I, II and III 
b) II, III and IV 
c) III, IV and V 
d) I, III, IV and V 
29. Given below is the list of vegetables available in the market. Select from these the two 
vegetables having homologous structures: 
Potato, sweet potato, ginger, radish, tomato, carrot, okra (Lady finger) 
a) Potato and sweet potato 
b) Radish and carrot 
c) Okra and sweet potato 
d) Potato and tomato 
30. A student obtains a sharp image of the distant window (W) of the school laboratory on the 
screen (S) using the given concave mirror (M) to determine its focal length. Which of the 
following distances should he measure to get the focal length of the mirror? 
 
a) MW 
 
 
 
 
b) MS 
c) SW 
d) MW – MS 
31. A student used a device (X) to obtain/focus the image of a well illuminated distant building 
on a screen (S) as shown below in the diagram. Select the correct statement about the device 
(X). 
 
a) This device is a concave lens of focal length 8 cm 
b) This device is a convex mirror of focal length 8 cm 
c) This device is a convex lens of focal length 4 cm 
d) This device is a convex lens of focal length 8 cm 
32. A student traces the path of a ray of light through a rectangular glass slab for the different 
values of angle of incidence. He observed all possible precautions at each step of the 
experiment. At the end of the experiment, on analyzing the measurement, which of the 
following conclusions is he likely to draw? 
a) i e r ? = ? < ? 
b) i e r ? < ? < ? 
c) i e r ? > ? > ? 
d) i e r ? = ? > ? 
33. A student traces the path of a ray of light through a triangular glass prism for different values 
of angle of incidence. On analyzing the ray diagrams, which one of the following conclusions 
is he likely to draw? 
a) The emergent ray is parallel to the incident ray 
b) The emergent ray bends at an angle to the direction of the incident ray 
c) The emergent ray and the refracted ray are at right angles to each other 
d) The emergent ray is perpendicular to the incident ray. 
34. When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates 
immediately with a brisk effervescene. Name this gas.  Describe the method of testing this 
gas. 
35. Students were asked to observe the permanent slides showing different stages of building in 
yeast under high power of a microscope. 
a) Which adjustment screw (coarse/fine) were you asked to move to focus the slides? 
b) Draw three diagrams in correct sequence showing budding in yeast. 
36. A 4 cm tall object is place on the principal axis of a convex lens. The distance of the object 
from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 
cm form it on screen on the other side of the lens. If the object is now moved a little away 
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