Science Past Year Paper SA-1(Set -3) - 2014, Class 10, CBSE Class 10 Notes | EduRev

 Page 1


 
 
 
 
Summative Assessement-1 2014 
 Science 
Class – X 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) All questions are compulsory. 
b) Questions 1 to 3 are one mark question. 
c) Questions 4 to 6 carry two marks each. 
d) Questions 7 to 17 carry three marks each. 
e) Questions 18 to 23 carry five marks each. 
f) Questions 24 to 35 carry one mark each. 
g) Questions 36 to 38 are two marks each. 
 
 
Section-A 
1. State the two hazards of nuclear energy. 
2. Give one example of decomposition reaction which is useful in Photography. 
3. Name the Endocrine gland that requires iodine for its production. What is the function of this 
hormone? 
4. What is meant by fuse wire? How is it connected in an electrical circuit. 
5. A) Based on the reactions given below, arrange the metals involved in these reaction in 
decreasing order of reactivity. 
B) What is the nature of reaction? 
a. 
4 4
Zn CuSO ZnSO Cu + ? + 
b. 
3 3 2
2 ( ) 2 Cu AgNO Cu NO Ag + ? + 
c. 
4 4
Zn FeSO ZnSO Fe + ? + 
d. 
4 4
Fe CuSO FeSO Cu + ? + 
6. Show the formation of 
2
Na O by the transfer of electrons. 
7. Three resistors R1, R2, R3 are connected to a battery. 
a) Draw a circuit diagrams to show the various combination, how they can be connected 
b) How will you connect the voltmeter and why? 
8. Two identical resistors each of resistance 10 ohm are connected in the combination of 
resistors in the two cases. 
a) In series 
b) In parallel, in turn to a batter of 6V. Calculate the ratio of power consumed in the 
combination of resistors in two cases. 
9. Four resistances each of resistance four ohm are connected in series. Four such combinations 
are connected parallel to each other. 
Page 2


 
 
 
 
Summative Assessement-1 2014 
 Science 
Class – X 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) All questions are compulsory. 
b) Questions 1 to 3 are one mark question. 
c) Questions 4 to 6 carry two marks each. 
d) Questions 7 to 17 carry three marks each. 
e) Questions 18 to 23 carry five marks each. 
f) Questions 24 to 35 carry one mark each. 
g) Questions 36 to 38 are two marks each. 
 
 
Section-A 
1. State the two hazards of nuclear energy. 
2. Give one example of decomposition reaction which is useful in Photography. 
3. Name the Endocrine gland that requires iodine for its production. What is the function of this 
hormone? 
4. What is meant by fuse wire? How is it connected in an electrical circuit. 
5. A) Based on the reactions given below, arrange the metals involved in these reaction in 
decreasing order of reactivity. 
B) What is the nature of reaction? 
a. 
4 4
Zn CuSO ZnSO Cu + ? + 
b. 
3 3 2
2 ( ) 2 Cu AgNO Cu NO Ag + ? + 
c. 
4 4
Zn FeSO ZnSO Fe + ? + 
d. 
4 4
Fe CuSO FeSO Cu + ? + 
6. Show the formation of 
2
Na O by the transfer of electrons. 
7. Three resistors R1, R2, R3 are connected to a battery. 
a) Draw a circuit diagrams to show the various combination, how they can be connected 
b) How will you connect the voltmeter and why? 
8. Two identical resistors each of resistance 10 ohm are connected in the combination of 
resistors in the two cases. 
a) In series 
b) In parallel, in turn to a batter of 6V. Calculate the ratio of power consumed in the 
combination of resistors in two cases. 
9. Four resistances each of resistance four ohm are connected in series. Four such combinations 
are connected parallel to each other. 
 
 
 
 
a) Draw the circuit diagram 
b) Calculate the resultant resistance of the combination 
10. What is meant by Induced current? Explain any one method of producing such current. 
11. Explain the three types of energy you get from oceans. 
12. Why does the sensitive plant show movement of leaves on being touched? Explain. How is this 
movement different from phototropism? 
13. Draw a diagram of the reflex action (arc), when you touch a hot object and label the 
following:- 
a) Sensory neuron 
b) Spinal cord 
c) Relay neuron 
d) Motor neuron 
14. A) Can combination reaction be an oxidation reaction. Give example. 
B) How will you test whether the gas evolved in a reaction is hydrogen? 
C) Why does copper not evolved hydrogen on reacting with dilute Sulphuric acid? 
15. In Faraday’s experiment if instead of moving the magnet towards the coil we move the coil 
towards the magnet, will there be any induced current? Justify your answer. Compare the two 
cases. 
16. A student accidently spills concentrated 
2 4
H SO on his hand. Before the teacher gets to know 
his friend washed his hand with water and also soap but the burning sensation on hand still 
continued. His friend then rubs solid sodium bicarbonate on his hand and then washed with 
water, finally the burning sensation is relieved. 
Answer the following questions based on the above situation: 
a) Mention the values shown by students friend 
b) Can you recommend any other substance available in the laboratory which can be used 
instead of sodium bicarbonate? 
c) Write the chemical reaction involved in the treatment of acid burn with sodium 
bicarbonate. 
17. A) Why cannot calcium be obtained by reduction of its oxide with carbon. 
B) An element forms on oxide 
2 3
A O which is acidic in nature. Identify as a metal or non-metal. 
C) Why do metals no evolve hydrogen gas with nitric acid? 
18. A) Draw the schematic diagram showing the common domestic circuit. 
B) Explain overloading and short circuit. 
19. A) State the rule to determine the direction of force experienced by a current carrying straight 
conductor placed in magnetic field 
B) Identified the type of magnetic field in the diagram below: 
   
C) Name the current used by us at home and the type of current obtained in solar panel. Give 
two differences between them. 
Page 3


 
 
 
 
Summative Assessement-1 2014 
 Science 
Class – X 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) All questions are compulsory. 
b) Questions 1 to 3 are one mark question. 
c) Questions 4 to 6 carry two marks each. 
d) Questions 7 to 17 carry three marks each. 
e) Questions 18 to 23 carry five marks each. 
f) Questions 24 to 35 carry one mark each. 
g) Questions 36 to 38 are two marks each. 
 
 
Section-A 
1. State the two hazards of nuclear energy. 
2. Give one example of decomposition reaction which is useful in Photography. 
3. Name the Endocrine gland that requires iodine for its production. What is the function of this 
hormone? 
4. What is meant by fuse wire? How is it connected in an electrical circuit. 
5. A) Based on the reactions given below, arrange the metals involved in these reaction in 
decreasing order of reactivity. 
B) What is the nature of reaction? 
a. 
4 4
Zn CuSO ZnSO Cu + ? + 
b. 
3 3 2
2 ( ) 2 Cu AgNO Cu NO Ag + ? + 
c. 
4 4
Zn FeSO ZnSO Fe + ? + 
d. 
4 4
Fe CuSO FeSO Cu + ? + 
6. Show the formation of 
2
Na O by the transfer of electrons. 
7. Three resistors R1, R2, R3 are connected to a battery. 
a) Draw a circuit diagrams to show the various combination, how they can be connected 
b) How will you connect the voltmeter and why? 
8. Two identical resistors each of resistance 10 ohm are connected in the combination of 
resistors in the two cases. 
a) In series 
b) In parallel, in turn to a batter of 6V. Calculate the ratio of power consumed in the 
combination of resistors in two cases. 
9. Four resistances each of resistance four ohm are connected in series. Four such combinations 
are connected parallel to each other. 
 
 
 
 
a) Draw the circuit diagram 
b) Calculate the resultant resistance of the combination 
10. What is meant by Induced current? Explain any one method of producing such current. 
11. Explain the three types of energy you get from oceans. 
12. Why does the sensitive plant show movement of leaves on being touched? Explain. How is this 
movement different from phototropism? 
13. Draw a diagram of the reflex action (arc), when you touch a hot object and label the 
following:- 
a) Sensory neuron 
b) Spinal cord 
c) Relay neuron 
d) Motor neuron 
14. A) Can combination reaction be an oxidation reaction. Give example. 
B) How will you test whether the gas evolved in a reaction is hydrogen? 
C) Why does copper not evolved hydrogen on reacting with dilute Sulphuric acid? 
15. In Faraday’s experiment if instead of moving the magnet towards the coil we move the coil 
towards the magnet, will there be any induced current? Justify your answer. Compare the two 
cases. 
16. A student accidently spills concentrated 
2 4
H SO on his hand. Before the teacher gets to know 
his friend washed his hand with water and also soap but the burning sensation on hand still 
continued. His friend then rubs solid sodium bicarbonate on his hand and then washed with 
water, finally the burning sensation is relieved. 
Answer the following questions based on the above situation: 
a) Mention the values shown by students friend 
b) Can you recommend any other substance available in the laboratory which can be used 
instead of sodium bicarbonate? 
c) Write the chemical reaction involved in the treatment of acid burn with sodium 
bicarbonate. 
17. A) Why cannot calcium be obtained by reduction of its oxide with carbon. 
B) An element forms on oxide 
2 3
A O which is acidic in nature. Identify as a metal or non-metal. 
C) Why do metals no evolve hydrogen gas with nitric acid? 
18. A) Draw the schematic diagram showing the common domestic circuit. 
B) Explain overloading and short circuit. 
19. A) State the rule to determine the direction of force experienced by a current carrying straight 
conductor placed in magnetic field 
B) Identified the type of magnetic field in the diagram below: 
   
C) Name the current used by us at home and the type of current obtained in solar panel. Give 
two differences between them. 
 
 
 
 
20. A) Point out two differences in each of the following :- 
a. Aerobic and anaerobic respiration 
b. Cerebrum and cerebellum 
B) How does the functional unit of kidney help in process of excretion? Explain. 
21. In the given diagram answer the question that follows. 
 
a) Label the parts marked A, B, C and D. 
b) What is the significance of double circulation? 
c) How are fishes and amphibian heart different from the human heart? 
22. A) Why is plaster of Paris written as 
4 2
1
2
CaSO H O ? How is it possible to have half molecule 
attached to 
4
CaSO 
B) State one difference between baking soda and baking powder. 
C) When electricity passed through the aqueous solution of sodium chloride, three products 
are obtained. Why this process is called Chlor-alkali? 
D) Why does an aqueous solution of acid conduct electricity? 
E) Name an acid base indicator which can be used by a visually impaired student. 
23. A) Distinguish between ‘Roasting’ and ‘Calcination’ which of these two is used for Sulphide 
ores? 
B) Write a chemical equation to illustrate the use of aluminium for joining cracked railway 
lines. 
C) Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure 
copper. 
D) How least reactive metals are obtained from their ore? 
 
Section – B 
Multiple choice questions 
24. A student was given three samples containing ethanoic acid, sodium bicarbonate solution and 
water in test tubes I, II and III respectively. On dipping a pH paper in them, he observed that 
the colour turned orange in I, blue in II and given in III. 
If arranged in increasing order of their pH, the sequence of these bottles would be 
a) I, III, II 
b) I, II, III 
c) III, I,II 
d) II,III,I 
Page 4


 
 
 
 
Summative Assessement-1 2014 
 Science 
Class – X 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) All questions are compulsory. 
b) Questions 1 to 3 are one mark question. 
c) Questions 4 to 6 carry two marks each. 
d) Questions 7 to 17 carry three marks each. 
e) Questions 18 to 23 carry five marks each. 
f) Questions 24 to 35 carry one mark each. 
g) Questions 36 to 38 are two marks each. 
 
 
Section-A 
1. State the two hazards of nuclear energy. 
2. Give one example of decomposition reaction which is useful in Photography. 
3. Name the Endocrine gland that requires iodine for its production. What is the function of this 
hormone? 
4. What is meant by fuse wire? How is it connected in an electrical circuit. 
5. A) Based on the reactions given below, arrange the metals involved in these reaction in 
decreasing order of reactivity. 
B) What is the nature of reaction? 
a. 
4 4
Zn CuSO ZnSO Cu + ? + 
b. 
3 3 2
2 ( ) 2 Cu AgNO Cu NO Ag + ? + 
c. 
4 4
Zn FeSO ZnSO Fe + ? + 
d. 
4 4
Fe CuSO FeSO Cu + ? + 
6. Show the formation of 
2
Na O by the transfer of electrons. 
7. Three resistors R1, R2, R3 are connected to a battery. 
a) Draw a circuit diagrams to show the various combination, how they can be connected 
b) How will you connect the voltmeter and why? 
8. Two identical resistors each of resistance 10 ohm are connected in the combination of 
resistors in the two cases. 
a) In series 
b) In parallel, in turn to a batter of 6V. Calculate the ratio of power consumed in the 
combination of resistors in two cases. 
9. Four resistances each of resistance four ohm are connected in series. Four such combinations 
are connected parallel to each other. 
 
 
 
 
a) Draw the circuit diagram 
b) Calculate the resultant resistance of the combination 
10. What is meant by Induced current? Explain any one method of producing such current. 
11. Explain the three types of energy you get from oceans. 
12. Why does the sensitive plant show movement of leaves on being touched? Explain. How is this 
movement different from phototropism? 
13. Draw a diagram of the reflex action (arc), when you touch a hot object and label the 
following:- 
a) Sensory neuron 
b) Spinal cord 
c) Relay neuron 
d) Motor neuron 
14. A) Can combination reaction be an oxidation reaction. Give example. 
B) How will you test whether the gas evolved in a reaction is hydrogen? 
C) Why does copper not evolved hydrogen on reacting with dilute Sulphuric acid? 
15. In Faraday’s experiment if instead of moving the magnet towards the coil we move the coil 
towards the magnet, will there be any induced current? Justify your answer. Compare the two 
cases. 
16. A student accidently spills concentrated 
2 4
H SO on his hand. Before the teacher gets to know 
his friend washed his hand with water and also soap but the burning sensation on hand still 
continued. His friend then rubs solid sodium bicarbonate on his hand and then washed with 
water, finally the burning sensation is relieved. 
Answer the following questions based on the above situation: 
a) Mention the values shown by students friend 
b) Can you recommend any other substance available in the laboratory which can be used 
instead of sodium bicarbonate? 
c) Write the chemical reaction involved in the treatment of acid burn with sodium 
bicarbonate. 
17. A) Why cannot calcium be obtained by reduction of its oxide with carbon. 
B) An element forms on oxide 
2 3
A O which is acidic in nature. Identify as a metal or non-metal. 
C) Why do metals no evolve hydrogen gas with nitric acid? 
18. A) Draw the schematic diagram showing the common domestic circuit. 
B) Explain overloading and short circuit. 
19. A) State the rule to determine the direction of force experienced by a current carrying straight 
conductor placed in magnetic field 
B) Identified the type of magnetic field in the diagram below: 
   
C) Name the current used by us at home and the type of current obtained in solar panel. Give 
two differences between them. 
 
 
 
 
20. A) Point out two differences in each of the following :- 
a. Aerobic and anaerobic respiration 
b. Cerebrum and cerebellum 
B) How does the functional unit of kidney help in process of excretion? Explain. 
21. In the given diagram answer the question that follows. 
 
a) Label the parts marked A, B, C and D. 
b) What is the significance of double circulation? 
c) How are fishes and amphibian heart different from the human heart? 
22. A) Why is plaster of Paris written as 
4 2
1
2
CaSO H O ? How is it possible to have half molecule 
attached to 
4
CaSO 
B) State one difference between baking soda and baking powder. 
C) When electricity passed through the aqueous solution of sodium chloride, three products 
are obtained. Why this process is called Chlor-alkali? 
D) Why does an aqueous solution of acid conduct electricity? 
E) Name an acid base indicator which can be used by a visually impaired student. 
23. A) Distinguish between ‘Roasting’ and ‘Calcination’ which of these two is used for Sulphide 
ores? 
B) Write a chemical equation to illustrate the use of aluminium for joining cracked railway 
lines. 
C) Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure 
copper. 
D) How least reactive metals are obtained from their ore? 
 
Section – B 
Multiple choice questions 
24. A student was given three samples containing ethanoic acid, sodium bicarbonate solution and 
water in test tubes I, II and III respectively. On dipping a pH paper in them, he observed that 
the colour turned orange in I, blue in II and given in III. 
If arranged in increasing order of their pH, the sequence of these bottles would be 
a) I, III, II 
b) I, II, III 
c) III, I,II 
d) II,III,I 
 
 
 
 
25. The chemical reaction between barium chloride and sodium Sulphate is an example of  
a) Combination 
b) A cracking sound 
c) A hissing sound 
d) No sound at all 
26. A student took some quick lime in a china dish and added a small amount of water to it. He 
would hear: 
a) A pop sound 
b) A cracking sound 
c) A hissing sound 
d) No sound at all 
27. A student added a piece of Zinc metal to four test tubes I, II, III, IV which respectively contain 
aqueous solution of aluminium sulphate, zinc sulphate, Ferrous sulphate and copper sulphate. 
In which solution he observed that the reaction has taken place 
a) I, II 
b) II, III 
c) III, IV 
d) I, IV 
28. Sequence in preparing a temporary mount 
a) Staining, mounting, putting cover slip 
b) Staining, putting cover slip, mounting 
c) Putting cover slip, staining, mounting 
d) Mounting, staining, putting cover slip 
29. A round black paper with the star shaped hole was used to cover a leaf of dispatched plant 
shown below: 
 
The plant was left in sunlight for 4 hours and then the leaf was plucked black paper remove 
and tested for the presence of starch. The areas which turned blue black when iodine was 
added. 
a) i, ii, iii, iv 
b) i, iii, ii, iv 
c) i, iv, iii 
d) i, ii, iii 
30. The seeds used in the experiment to show that 
2
CO in given out during respiration are: 
a) Dry seeds 
b) Crushed seeds 
Page 5


 
 
 
 
Summative Assessement-1 2014 
 Science 
Class – X 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
 General Instructions: 
a) All questions are compulsory. 
b) Questions 1 to 3 are one mark question. 
c) Questions 4 to 6 carry two marks each. 
d) Questions 7 to 17 carry three marks each. 
e) Questions 18 to 23 carry five marks each. 
f) Questions 24 to 35 carry one mark each. 
g) Questions 36 to 38 are two marks each. 
 
 
Section-A 
1. State the two hazards of nuclear energy. 
2. Give one example of decomposition reaction which is useful in Photography. 
3. Name the Endocrine gland that requires iodine for its production. What is the function of this 
hormone? 
4. What is meant by fuse wire? How is it connected in an electrical circuit. 
5. A) Based on the reactions given below, arrange the metals involved in these reaction in 
decreasing order of reactivity. 
B) What is the nature of reaction? 
a. 
4 4
Zn CuSO ZnSO Cu + ? + 
b. 
3 3 2
2 ( ) 2 Cu AgNO Cu NO Ag + ? + 
c. 
4 4
Zn FeSO ZnSO Fe + ? + 
d. 
4 4
Fe CuSO FeSO Cu + ? + 
6. Show the formation of 
2
Na O by the transfer of electrons. 
7. Three resistors R1, R2, R3 are connected to a battery. 
a) Draw a circuit diagrams to show the various combination, how they can be connected 
b) How will you connect the voltmeter and why? 
8. Two identical resistors each of resistance 10 ohm are connected in the combination of 
resistors in the two cases. 
a) In series 
b) In parallel, in turn to a batter of 6V. Calculate the ratio of power consumed in the 
combination of resistors in two cases. 
9. Four resistances each of resistance four ohm are connected in series. Four such combinations 
are connected parallel to each other. 
 
 
 
 
a) Draw the circuit diagram 
b) Calculate the resultant resistance of the combination 
10. What is meant by Induced current? Explain any one method of producing such current. 
11. Explain the three types of energy you get from oceans. 
12. Why does the sensitive plant show movement of leaves on being touched? Explain. How is this 
movement different from phototropism? 
13. Draw a diagram of the reflex action (arc), when you touch a hot object and label the 
following:- 
a) Sensory neuron 
b) Spinal cord 
c) Relay neuron 
d) Motor neuron 
14. A) Can combination reaction be an oxidation reaction. Give example. 
B) How will you test whether the gas evolved in a reaction is hydrogen? 
C) Why does copper not evolved hydrogen on reacting with dilute Sulphuric acid? 
15. In Faraday’s experiment if instead of moving the magnet towards the coil we move the coil 
towards the magnet, will there be any induced current? Justify your answer. Compare the two 
cases. 
16. A student accidently spills concentrated 
2 4
H SO on his hand. Before the teacher gets to know 
his friend washed his hand with water and also soap but the burning sensation on hand still 
continued. His friend then rubs solid sodium bicarbonate on his hand and then washed with 
water, finally the burning sensation is relieved. 
Answer the following questions based on the above situation: 
a) Mention the values shown by students friend 
b) Can you recommend any other substance available in the laboratory which can be used 
instead of sodium bicarbonate? 
c) Write the chemical reaction involved in the treatment of acid burn with sodium 
bicarbonate. 
17. A) Why cannot calcium be obtained by reduction of its oxide with carbon. 
B) An element forms on oxide 
2 3
A O which is acidic in nature. Identify as a metal or non-metal. 
C) Why do metals no evolve hydrogen gas with nitric acid? 
18. A) Draw the schematic diagram showing the common domestic circuit. 
B) Explain overloading and short circuit. 
19. A) State the rule to determine the direction of force experienced by a current carrying straight 
conductor placed in magnetic field 
B) Identified the type of magnetic field in the diagram below: 
   
C) Name the current used by us at home and the type of current obtained in solar panel. Give 
two differences between them. 
 
 
 
 
20. A) Point out two differences in each of the following :- 
a. Aerobic and anaerobic respiration 
b. Cerebrum and cerebellum 
B) How does the functional unit of kidney help in process of excretion? Explain. 
21. In the given diagram answer the question that follows. 
 
a) Label the parts marked A, B, C and D. 
b) What is the significance of double circulation? 
c) How are fishes and amphibian heart different from the human heart? 
22. A) Why is plaster of Paris written as 
4 2
1
2
CaSO H O ? How is it possible to have half molecule 
attached to 
4
CaSO 
B) State one difference between baking soda and baking powder. 
C) When electricity passed through the aqueous solution of sodium chloride, three products 
are obtained. Why this process is called Chlor-alkali? 
D) Why does an aqueous solution of acid conduct electricity? 
E) Name an acid base indicator which can be used by a visually impaired student. 
23. A) Distinguish between ‘Roasting’ and ‘Calcination’ which of these two is used for Sulphide 
ores? 
B) Write a chemical equation to illustrate the use of aluminium for joining cracked railway 
lines. 
C) Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure 
copper. 
D) How least reactive metals are obtained from their ore? 
 
Section – B 
Multiple choice questions 
24. A student was given three samples containing ethanoic acid, sodium bicarbonate solution and 
water in test tubes I, II and III respectively. On dipping a pH paper in them, he observed that 
the colour turned orange in I, blue in II and given in III. 
If arranged in increasing order of their pH, the sequence of these bottles would be 
a) I, III, II 
b) I, II, III 
c) III, I,II 
d) II,III,I 
 
 
 
 
25. The chemical reaction between barium chloride and sodium Sulphate is an example of  
a) Combination 
b) A cracking sound 
c) A hissing sound 
d) No sound at all 
26. A student took some quick lime in a china dish and added a small amount of water to it. He 
would hear: 
a) A pop sound 
b) A cracking sound 
c) A hissing sound 
d) No sound at all 
27. A student added a piece of Zinc metal to four test tubes I, II, III, IV which respectively contain 
aqueous solution of aluminium sulphate, zinc sulphate, Ferrous sulphate and copper sulphate. 
In which solution he observed that the reaction has taken place 
a) I, II 
b) II, III 
c) III, IV 
d) I, IV 
28. Sequence in preparing a temporary mount 
a) Staining, mounting, putting cover slip 
b) Staining, putting cover slip, mounting 
c) Putting cover slip, staining, mounting 
d) Mounting, staining, putting cover slip 
29. A round black paper with the star shaped hole was used to cover a leaf of dispatched plant 
shown below: 
 
The plant was left in sunlight for 4 hours and then the leaf was plucked black paper remove 
and tested for the presence of starch. The areas which turned blue black when iodine was 
added. 
a) i, ii, iii, iv 
b) i, iii, ii, iv 
c) i, iv, iii 
d) i, ii, iii 
30. The seeds used in the experiment to show that 
2
CO in given out during respiration are: 
a) Dry seeds 
b) Crushed seeds 
 
 
 
 
c) Boiled seeds 
d) Germinating seeds 
31. A student has to connect 4 cells of 1.5 V each, to form a battery of 6V. The correct way of 
connecting those cells is shown in figure: 
 
a) A 
b) B 
c) C 
d) D 
32. Out of the four circuits shown for studying the dependence of the current on the potential 
difference across a resistor, the correct circuit is: 
a)   
 
b)   
 
c)   
 
d)   
 
33. An ammeter has 20 division between 20 mA and 30m A. The least count of the ammeter is  
a) 0.5 mA 
b) 1 mA