Class 10 Science: CBSE (Official) Sample Question Paper (2025-26) | Science Class 10 PDF Download

 Page 1


*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
  SCIENCE – Code no. 086  
SAMPLE QUESTION PAPER*  
CLASS – X (2025-26) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
(i) This question paper consists of 39 questions in 3 sections. Section A is Biology, 
Section B is Chemistry and Section C is Physics. 
(ii) All questions are compulsory. However, an internal choice is provided in some 
questions. A student is expected to attempt only one of these questions.  
Section – A 
Marks 
1 Select the group in which all organisms have the same mode of nutrition.                                                   
A. Cuscuta, yeast, legumes, leeches and tapeworm 
B. Cactus, ticks, lice, leeches and cow 
C. Cuscuta, ticks, lice, leeches and tapeworm 
D. Cactus, grass, lice, lion and tapeworm  
1 
2 Which of the following options indicates the products formed after breakdown 
of the glucose in our muscle cells when there is lack of oxygen?                                   
A. Ethanol + carbon dioxide + Energy 
B. Lactic acid + Energy 
C. Lactic acid + carbon monoxide + Energy 
D. Carbon dioxide + Water + Energy 
1 
3 Which of the following is a correct combination of function and part of the 
brain?  
A. Posture and balance: Cerebrum 
B. Salivation: Medulla in midbrain 
C. Hunger: Pons in hindbrain 
D. Blood pressure: Medulla in hindbrain 
1 
4 The blood glucose level in a patient was very high. It may be due to 
inadequate secretion of: 
A. growth hormone from pituitary gland 
B. oestrogen from ovary 
C. insulin from pituitary gland 
D. insulin from pancreas 
1 
5 In a cross between black furred rabbit (B) and white furred rabbit (b), all 
offspring were found to have black fur. What can be inferred about the genetic 
makeup of the parent rabbits? 
A. BB X bb  
B. Bb X Bb  
C. Bb X bb  
D. bb X bb  
1 
Page 2


*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
  SCIENCE – Code no. 086  
SAMPLE QUESTION PAPER*  
CLASS – X (2025-26) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
(i) This question paper consists of 39 questions in 3 sections. Section A is Biology, 
Section B is Chemistry and Section C is Physics. 
(ii) All questions are compulsory. However, an internal choice is provided in some 
questions. A student is expected to attempt only one of these questions.  
Section – A 
Marks 
1 Select the group in which all organisms have the same mode of nutrition.                                                   
A. Cuscuta, yeast, legumes, leeches and tapeworm 
B. Cactus, ticks, lice, leeches and cow 
C. Cuscuta, ticks, lice, leeches and tapeworm 
D. Cactus, grass, lice, lion and tapeworm  
1 
2 Which of the following options indicates the products formed after breakdown 
of the glucose in our muscle cells when there is lack of oxygen?                                   
A. Ethanol + carbon dioxide + Energy 
B. Lactic acid + Energy 
C. Lactic acid + carbon monoxide + Energy 
D. Carbon dioxide + Water + Energy 
1 
3 Which of the following is a correct combination of function and part of the 
brain?  
A. Posture and balance: Cerebrum 
B. Salivation: Medulla in midbrain 
C. Hunger: Pons in hindbrain 
D. Blood pressure: Medulla in hindbrain 
1 
4 The blood glucose level in a patient was very high. It may be due to 
inadequate secretion of: 
A. growth hormone from pituitary gland 
B. oestrogen from ovary 
C. insulin from pituitary gland 
D. insulin from pancreas 
1 
5 In a cross between black furred rabbit (B) and white furred rabbit (b), all 
offspring were found to have black fur. What can be inferred about the genetic 
makeup of the parent rabbits? 
A. BB X bb  
B. Bb X Bb  
C. Bb X bb  
D. bb X bb  
1 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
6 Which are the correct statements related to ozone? 
(i) Ozone layer helps in increasing the UV radiations reaching earth. 
(ii) Ozone is a deadly poison. 
(iii) Ozone layer shields the earth from UV radiations. 
(iv) Ozone layer prevents UV rays which cause skin cancer. 
(v) Ozone is formed with the help of Chloroflurocarbons. 
 
A. (i), (ii), (iii) 
B. (ii), (iii), (iv)   
C. (iii), (iv), (v) 
D. (i), (iv), (v)  
1 
7 Which of the following human activities has resulted in an increase of non-
biodegradable substances?  
A. Organic farming 
B. Increase in tree plantation 
C. Use of plastic as packaging material 
D. Composting of kitchen waste  
1 
The following two questions consist of two statements – Assertion (A) and Reason (R). 
Answer these questions by selecting the appropriate option given below:  
A. Both A and R are true, and R is the correct explanation of A.  
B. Both A and R are true, and R is not the correct explanation of A.  
C. A is true but R is false.  
D. A is false but R is true . 
8 Assertion (A): Tallness of a pea plant is controlled by an enzyme. 
Reason (R):  The gene for that enzyme makes proteins which help the plant to 
be tall. 
1 
9 Assertion (A): Vulture will always have the least amount of pesticides in a food 
chain.  
Reason (R): Vulture occupies the last trophic level and it gets only 10% of 
energy of the previous trophic level.  
1 
10 Unlike animals, plants do not have any excretory products as they do not eat 
food. Comment upon the statement with justification.  
2 
11 Students to attempt either option A or B. 
A. How many chambers are there in the heart of the following organisms? 
How is mixing of oxygenated and deoxygenated blood prevented in their 
body?  
(i) Fishes 
(ii) Humans                                      
OR 
B. Explain the mechanism by which the water is transported in plants? 
2 
12 About 100 acres of forest land was declared as Natural reserve park. The 
following organisms were predominant in the Natural reserve park:   
2 
Page 3


*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
  SCIENCE – Code no. 086  
SAMPLE QUESTION PAPER*  
CLASS – X (2025-26) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
(i) This question paper consists of 39 questions in 3 sections. Section A is Biology, 
Section B is Chemistry and Section C is Physics. 
(ii) All questions are compulsory. However, an internal choice is provided in some 
questions. A student is expected to attempt only one of these questions.  
Section – A 
Marks 
1 Select the group in which all organisms have the same mode of nutrition.                                                   
A. Cuscuta, yeast, legumes, leeches and tapeworm 
B. Cactus, ticks, lice, leeches and cow 
C. Cuscuta, ticks, lice, leeches and tapeworm 
D. Cactus, grass, lice, lion and tapeworm  
1 
2 Which of the following options indicates the products formed after breakdown 
of the glucose in our muscle cells when there is lack of oxygen?                                   
A. Ethanol + carbon dioxide + Energy 
B. Lactic acid + Energy 
C. Lactic acid + carbon monoxide + Energy 
D. Carbon dioxide + Water + Energy 
1 
3 Which of the following is a correct combination of function and part of the 
brain?  
A. Posture and balance: Cerebrum 
B. Salivation: Medulla in midbrain 
C. Hunger: Pons in hindbrain 
D. Blood pressure: Medulla in hindbrain 
1 
4 The blood glucose level in a patient was very high. It may be due to 
inadequate secretion of: 
A. growth hormone from pituitary gland 
B. oestrogen from ovary 
C. insulin from pituitary gland 
D. insulin from pancreas 
1 
5 In a cross between black furred rabbit (B) and white furred rabbit (b), all 
offspring were found to have black fur. What can be inferred about the genetic 
makeup of the parent rabbits? 
A. BB X bb  
B. Bb X Bb  
C. Bb X bb  
D. bb X bb  
1 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
6 Which are the correct statements related to ozone? 
(i) Ozone layer helps in increasing the UV radiations reaching earth. 
(ii) Ozone is a deadly poison. 
(iii) Ozone layer shields the earth from UV radiations. 
(iv) Ozone layer prevents UV rays which cause skin cancer. 
(v) Ozone is formed with the help of Chloroflurocarbons. 
 
A. (i), (ii), (iii) 
B. (ii), (iii), (iv)   
C. (iii), (iv), (v) 
D. (i), (iv), (v)  
1 
7 Which of the following human activities has resulted in an increase of non-
biodegradable substances?  
A. Organic farming 
B. Increase in tree plantation 
C. Use of plastic as packaging material 
D. Composting of kitchen waste  
1 
The following two questions consist of two statements – Assertion (A) and Reason (R). 
Answer these questions by selecting the appropriate option given below:  
A. Both A and R are true, and R is the correct explanation of A.  
B. Both A and R are true, and R is not the correct explanation of A.  
C. A is true but R is false.  
D. A is false but R is true . 
8 Assertion (A): Tallness of a pea plant is controlled by an enzyme. 
Reason (R):  The gene for that enzyme makes proteins which help the plant to 
be tall. 
1 
9 Assertion (A): Vulture will always have the least amount of pesticides in a food 
chain.  
Reason (R): Vulture occupies the last trophic level and it gets only 10% of 
energy of the previous trophic level.  
1 
10 Unlike animals, plants do not have any excretory products as they do not eat 
food. Comment upon the statement with justification.  
2 
11 Students to attempt either option A or B. 
A. How many chambers are there in the heart of the following organisms? 
How is mixing of oxygenated and deoxygenated blood prevented in their 
body?  
(i) Fishes 
(ii) Humans                                      
OR 
B. Explain the mechanism by which the water is transported in plants? 
2 
12 About 100 acres of forest land was declared as Natural reserve park. The 
following organisms were predominant in the Natural reserve park:   
2 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
rabbit, frog, grass, fish, fox, water insects, zebra, peacock, snake, trees, bird, 
owl, insects, tiger, vulture, duck.  
Create a food web comprising two separate food chains with different 
producers by using the above data. 
13 Draw and explain how the nerve cells help in transmission of impulses?  3 
14 In a genetic experiment, plants with pure round green seeds (RRyy) were 
crossed with plants with wrinkled yellow seeds (rrYY).?  
(i) Show the gametes formed when F1 was self-pollinated.  
(ii) A total of 144 seeds were produced which developed into saplings. 
Show the ratio in which these traits are independently inherited in 
these144 sapling.  
3 
15 Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her 
to understand some steps in the process of digestion of the food taken by her 
by answering the questions given below. 
Attempt either subpart A or B. 
A. Which of these food items is rich in proteins? In which part of the 
alimentary canal is the digestion of this component initiated? Name the 
enzymes, conditions required and the glands associated with the 
digestion here.                                                                                     
OR 
B. Which of these food items contains fats? How is it digested? 
C. Which of these food items is rich in starch? How is its digestion initiated?  
D. The figure given below represents parts of the human alimentary canal. 
Which of these parts will have the maximum amount of digested food as 
soon as the process of digestion is completed?   
 
4 
Page 4


*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
  SCIENCE – Code no. 086  
SAMPLE QUESTION PAPER*  
CLASS – X (2025-26) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
(i) This question paper consists of 39 questions in 3 sections. Section A is Biology, 
Section B is Chemistry and Section C is Physics. 
(ii) All questions are compulsory. However, an internal choice is provided in some 
questions. A student is expected to attempt only one of these questions.  
Section – A 
Marks 
1 Select the group in which all organisms have the same mode of nutrition.                                                   
A. Cuscuta, yeast, legumes, leeches and tapeworm 
B. Cactus, ticks, lice, leeches and cow 
C. Cuscuta, ticks, lice, leeches and tapeworm 
D. Cactus, grass, lice, lion and tapeworm  
1 
2 Which of the following options indicates the products formed after breakdown 
of the glucose in our muscle cells when there is lack of oxygen?                                   
A. Ethanol + carbon dioxide + Energy 
B. Lactic acid + Energy 
C. Lactic acid + carbon monoxide + Energy 
D. Carbon dioxide + Water + Energy 
1 
3 Which of the following is a correct combination of function and part of the 
brain?  
A. Posture and balance: Cerebrum 
B. Salivation: Medulla in midbrain 
C. Hunger: Pons in hindbrain 
D. Blood pressure: Medulla in hindbrain 
1 
4 The blood glucose level in a patient was very high. It may be due to 
inadequate secretion of: 
A. growth hormone from pituitary gland 
B. oestrogen from ovary 
C. insulin from pituitary gland 
D. insulin from pancreas 
1 
5 In a cross between black furred rabbit (B) and white furred rabbit (b), all 
offspring were found to have black fur. What can be inferred about the genetic 
makeup of the parent rabbits? 
A. BB X bb  
B. Bb X Bb  
C. Bb X bb  
D. bb X bb  
1 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
6 Which are the correct statements related to ozone? 
(i) Ozone layer helps in increasing the UV radiations reaching earth. 
(ii) Ozone is a deadly poison. 
(iii) Ozone layer shields the earth from UV radiations. 
(iv) Ozone layer prevents UV rays which cause skin cancer. 
(v) Ozone is formed with the help of Chloroflurocarbons. 
 
A. (i), (ii), (iii) 
B. (ii), (iii), (iv)   
C. (iii), (iv), (v) 
D. (i), (iv), (v)  
1 
7 Which of the following human activities has resulted in an increase of non-
biodegradable substances?  
A. Organic farming 
B. Increase in tree plantation 
C. Use of plastic as packaging material 
D. Composting of kitchen waste  
1 
The following two questions consist of two statements – Assertion (A) and Reason (R). 
Answer these questions by selecting the appropriate option given below:  
A. Both A and R are true, and R is the correct explanation of A.  
B. Both A and R are true, and R is not the correct explanation of A.  
C. A is true but R is false.  
D. A is false but R is true . 
8 Assertion (A): Tallness of a pea plant is controlled by an enzyme. 
Reason (R):  The gene for that enzyme makes proteins which help the plant to 
be tall. 
1 
9 Assertion (A): Vulture will always have the least amount of pesticides in a food 
chain.  
Reason (R): Vulture occupies the last trophic level and it gets only 10% of 
energy of the previous trophic level.  
1 
10 Unlike animals, plants do not have any excretory products as they do not eat 
food. Comment upon the statement with justification.  
2 
11 Students to attempt either option A or B. 
A. How many chambers are there in the heart of the following organisms? 
How is mixing of oxygenated and deoxygenated blood prevented in their 
body?  
(i) Fishes 
(ii) Humans                                      
OR 
B. Explain the mechanism by which the water is transported in plants? 
2 
12 About 100 acres of forest land was declared as Natural reserve park. The 
following organisms were predominant in the Natural reserve park:   
2 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
rabbit, frog, grass, fish, fox, water insects, zebra, peacock, snake, trees, bird, 
owl, insects, tiger, vulture, duck.  
Create a food web comprising two separate food chains with different 
producers by using the above data. 
13 Draw and explain how the nerve cells help in transmission of impulses?  3 
14 In a genetic experiment, plants with pure round green seeds (RRyy) were 
crossed with plants with wrinkled yellow seeds (rrYY).?  
(i) Show the gametes formed when F1 was self-pollinated.  
(ii) A total of 144 seeds were produced which developed into saplings. 
Show the ratio in which these traits are independently inherited in 
these144 sapling.  
3 
15 Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her 
to understand some steps in the process of digestion of the food taken by her 
by answering the questions given below. 
Attempt either subpart A or B. 
A. Which of these food items is rich in proteins? In which part of the 
alimentary canal is the digestion of this component initiated? Name the 
enzymes, conditions required and the glands associated with the 
digestion here.                                                                                     
OR 
B. Which of these food items contains fats? How is it digested? 
C. Which of these food items is rich in starch? How is its digestion initiated?  
D. The figure given below represents parts of the human alimentary canal. 
Which of these parts will have the maximum amount of digested food as 
soon as the process of digestion is completed?   
 
4 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
For visually impaired students  
D.  How will the digested food be taken up by the alimentary canal?  
16 Attempt either option A or B. 
A. Puneet wanted to grow banana plants.   
(i) Based on your knowledge on plant reproduction should he opt for seeds 
or any alternate method of reproduction. Justify your answer.   
(ii) Offsprings of a banana plant usually show very little variation. What 
causes variation and are variations good or bad? Justify.  
OR 
B. Annie was conducting research on the number of fruits produced by 
watermelon under different conditions.??She grew 25 watermelon plants 
each in both glass house A and B.?She introduced pollinators in glass 
house A only.?  
(i) What difference will she observe in the number of fruits produced in the 
two glass houses? Explain with reason.  
(ii) List 3 changes that will occur in a flower once it gets fertilized.   
5 
Section – B 
17 Which of the following equations represent redox reactions and what are the 
values for ‘p’ and ‘q’ in these equations?  
Equation 1:  Fe2O3(s) + 2Al(s)              Al2O3 (s) + p Fe(l)  + heat 
Equation 2:  2C4H10(g) + 13O2(g)      
?
     8CO2(g)+ q H2O(g) 
A. Only equation 1 is a redox reaction, p =1 and q=3 
B. Both equations 1 and 2 are redox reactions, p= 2 and q=4 
C. Only equation 2 is a redox reaction, p= 2 and q= 10 
D. Both equations 1 and 2 are redox reactions, p= 2 and q=10 
1 
18 Four statements about the reactions of oxides with dilute hydrochloric acid and 
aqueous sodium hydroxide are listed.  
I. Aluminium oxide reacts with both dilute hydrochloric acid and aqueous 
sodium hydroxide.  
II. Calcium oxide reacts with dilute hydrochloric acid and aqueous sodium 
hydroxide. 
III. Zinc oxide reacts with both dilute hydrochloric acid and aqueous sodium 
hydroxide. 
IV. Sulphur dioxide does not react with either dilute hydrochloric acid or 
aqueous sodium hydroxide.  
Which statements are correct?  
A. I and II  
B. I and III  
C. II and IV  
D. III and IV 
1 
Page 5


*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
  SCIENCE – Code no. 086  
SAMPLE QUESTION PAPER*  
CLASS – X (2025-26) 
Max. Marks: 80                                                                      Time Allowed: 3 hours  
General Instructions: 
(i) This question paper consists of 39 questions in 3 sections. Section A is Biology, 
Section B is Chemistry and Section C is Physics. 
(ii) All questions are compulsory. However, an internal choice is provided in some 
questions. A student is expected to attempt only one of these questions.  
Section – A 
Marks 
1 Select the group in which all organisms have the same mode of nutrition.                                                   
A. Cuscuta, yeast, legumes, leeches and tapeworm 
B. Cactus, ticks, lice, leeches and cow 
C. Cuscuta, ticks, lice, leeches and tapeworm 
D. Cactus, grass, lice, lion and tapeworm  
1 
2 Which of the following options indicates the products formed after breakdown 
of the glucose in our muscle cells when there is lack of oxygen?                                   
A. Ethanol + carbon dioxide + Energy 
B. Lactic acid + Energy 
C. Lactic acid + carbon monoxide + Energy 
D. Carbon dioxide + Water + Energy 
1 
3 Which of the following is a correct combination of function and part of the 
brain?  
A. Posture and balance: Cerebrum 
B. Salivation: Medulla in midbrain 
C. Hunger: Pons in hindbrain 
D. Blood pressure: Medulla in hindbrain 
1 
4 The blood glucose level in a patient was very high. It may be due to 
inadequate secretion of: 
A. growth hormone from pituitary gland 
B. oestrogen from ovary 
C. insulin from pituitary gland 
D. insulin from pancreas 
1 
5 In a cross between black furred rabbit (B) and white furred rabbit (b), all 
offspring were found to have black fur. What can be inferred about the genetic 
makeup of the parent rabbits? 
A. BB X bb  
B. Bb X Bb  
C. Bb X bb  
D. bb X bb  
1 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
6 Which are the correct statements related to ozone? 
(i) Ozone layer helps in increasing the UV radiations reaching earth. 
(ii) Ozone is a deadly poison. 
(iii) Ozone layer shields the earth from UV radiations. 
(iv) Ozone layer prevents UV rays which cause skin cancer. 
(v) Ozone is formed with the help of Chloroflurocarbons. 
 
A. (i), (ii), (iii) 
B. (ii), (iii), (iv)   
C. (iii), (iv), (v) 
D. (i), (iv), (v)  
1 
7 Which of the following human activities has resulted in an increase of non-
biodegradable substances?  
A. Organic farming 
B. Increase in tree plantation 
C. Use of plastic as packaging material 
D. Composting of kitchen waste  
1 
The following two questions consist of two statements – Assertion (A) and Reason (R). 
Answer these questions by selecting the appropriate option given below:  
A. Both A and R are true, and R is the correct explanation of A.  
B. Both A and R are true, and R is not the correct explanation of A.  
C. A is true but R is false.  
D. A is false but R is true . 
8 Assertion (A): Tallness of a pea plant is controlled by an enzyme. 
Reason (R):  The gene for that enzyme makes proteins which help the plant to 
be tall. 
1 
9 Assertion (A): Vulture will always have the least amount of pesticides in a food 
chain.  
Reason (R): Vulture occupies the last trophic level and it gets only 10% of 
energy of the previous trophic level.  
1 
10 Unlike animals, plants do not have any excretory products as they do not eat 
food. Comment upon the statement with justification.  
2 
11 Students to attempt either option A or B. 
A. How many chambers are there in the heart of the following organisms? 
How is mixing of oxygenated and deoxygenated blood prevented in their 
body?  
(i) Fishes 
(ii) Humans                                      
OR 
B. Explain the mechanism by which the water is transported in plants? 
2 
12 About 100 acres of forest land was declared as Natural reserve park. The 
following organisms were predominant in the Natural reserve park:   
2 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
rabbit, frog, grass, fish, fox, water insects, zebra, peacock, snake, trees, bird, 
owl, insects, tiger, vulture, duck.  
Create a food web comprising two separate food chains with different 
producers by using the above data. 
13 Draw and explain how the nerve cells help in transmission of impulses?  3 
14 In a genetic experiment, plants with pure round green seeds (RRyy) were 
crossed with plants with wrinkled yellow seeds (rrYY).?  
(i) Show the gametes formed when F1 was self-pollinated.  
(ii) A total of 144 seeds were produced which developed into saplings. 
Show the ratio in which these traits are independently inherited in 
these144 sapling.  
3 
15 Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her 
to understand some steps in the process of digestion of the food taken by her 
by answering the questions given below. 
Attempt either subpart A or B. 
A. Which of these food items is rich in proteins? In which part of the 
alimentary canal is the digestion of this component initiated? Name the 
enzymes, conditions required and the glands associated with the 
digestion here.                                                                                     
OR 
B. Which of these food items contains fats? How is it digested? 
C. Which of these food items is rich in starch? How is its digestion initiated?  
D. The figure given below represents parts of the human alimentary canal. 
Which of these parts will have the maximum amount of digested food as 
soon as the process of digestion is completed?   
 
4 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
For visually impaired students  
D.  How will the digested food be taken up by the alimentary canal?  
16 Attempt either option A or B. 
A. Puneet wanted to grow banana plants.   
(i) Based on your knowledge on plant reproduction should he opt for seeds 
or any alternate method of reproduction. Justify your answer.   
(ii) Offsprings of a banana plant usually show very little variation. What 
causes variation and are variations good or bad? Justify.  
OR 
B. Annie was conducting research on the number of fruits produced by 
watermelon under different conditions.??She grew 25 watermelon plants 
each in both glass house A and B.?She introduced pollinators in glass 
house A only.?  
(i) What difference will she observe in the number of fruits produced in the 
two glass houses? Explain with reason.  
(ii) List 3 changes that will occur in a flower once it gets fertilized.   
5 
Section – B 
17 Which of the following equations represent redox reactions and what are the 
values for ‘p’ and ‘q’ in these equations?  
Equation 1:  Fe2O3(s) + 2Al(s)              Al2O3 (s) + p Fe(l)  + heat 
Equation 2:  2C4H10(g) + 13O2(g)      
?
     8CO2(g)+ q H2O(g) 
A. Only equation 1 is a redox reaction, p =1 and q=3 
B. Both equations 1 and 2 are redox reactions, p= 2 and q=4 
C. Only equation 2 is a redox reaction, p= 2 and q= 10 
D. Both equations 1 and 2 are redox reactions, p= 2 and q=10 
1 
18 Four statements about the reactions of oxides with dilute hydrochloric acid and 
aqueous sodium hydroxide are listed.  
I. Aluminium oxide reacts with both dilute hydrochloric acid and aqueous 
sodium hydroxide.  
II. Calcium oxide reacts with dilute hydrochloric acid and aqueous sodium 
hydroxide. 
III. Zinc oxide reacts with both dilute hydrochloric acid and aqueous sodium 
hydroxide. 
IV. Sulphur dioxide does not react with either dilute hydrochloric acid or 
aqueous sodium hydroxide.  
Which statements are correct?  
A. I and II  
B. I and III  
C. II and IV  
D. III and IV 
1 
*Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session 
i.e. 2025-26. 
19 An iron nail is added to each of the two test tubes ‘P’ and ‘Q’ containing 
aqueous copper (II) sulphate, and aqueous silver nitrate respectively. Which of 
the following observation is correct? 
A. In test tube ‘P’ iron nail is coated with a blue coating and in test tube ‘Q’ 
there is no reaction. 
B. Iron nail is coated with a brown coating in test tube ‘P’ and silver coating 
in test tube ‘Q’. 
C. There is no reaction in either of the test tubes ‘P’ or ‘Q’. 
D. There is no reaction in test tube ‘P’ but a silver coating on iron nail is 
seen in test tube ‘Q’. 
1 
20 Methyl orange is added to dilute hydrochloric acid and to aqueous sodium 
hydroxide. What is the colour of the methyl orange in each solution? 
Sample colour in dilute 
hydrochloric acid 
colour in aqueous 
sodium hydroxide 
A Orange Red 
B Red Yellow 
C Red Orange 
D Yellow Red 
 
1 
21 Which of the following substances when dissolved in equal volume of water, 
will have the highest pH value? 
A. Sulphuric acid 
B. Acetic acid 
C. Magnesium hydroxide 
D. Sodium hydroxide 
1 
22 When excess of carbon dioxide is passed through lime water, the milkiness 
disappears because 
A. water soluble calcium carbonate converts to water soluble calcium 
bicarbonate.  
B. insoluble calcium carbonate converts to water soluble calcium 
bicarbonate. 
C. water soluble calcium carbonate converts to insoluble calcium 
bicarbonate. 
D. insoluble calcium carbonate converts to insoluble calcium bicarbonate. 
1 
23 In the reaction of aqueous solution of barium chloride with aqueous solution of 
sodium sulphate, the aqueous solution formed will be:                                                                                                                                                                                                                                          
A.  BaCl2 
B.  BaSO4 
C. Na2SO4 
D. NaCl             
1 
The following question consists of two statements – Assertion (A) and Reason (R). Answer 
these questions by selecting the appropriate option given below:  
A. Both A and R are true, and R is the correct explanation of A.  
B. Both A and R are true, and R is not the correct explanation of A.