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

 Page 1


 
 
 
 
Summative Assessment-1 2014-2015 
Science 
Class – X 
 
 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 based on practical skills. 
Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are questions based on practical skills are two 
marks questions. 
 
 
Section – A 
1. Identify the chemical component that helps muscle cells to change their shape. 
2. Define magnetic field of a bar magnet. 
3. Name any two non-conventional sources of energy. 
4. The blue colour of copper Sulphate solution starts fading when zinc rod is dipped in it. State 
reason for this change and also write chemical equation for the reaction involved. 
5. A compound ‘Z’ is formed by the transfer of electrons from a metal ‘X’ to a non-metal ‘Y’. 
Identify the type of bond formed in the compound. List three general properties of the 
compound formed by such type of bonds. 
6. a) Name the respiratory pigment found in human beings. 
b) How is carbon dioxide transported in our body? 
7. List the raw materials needed for the manufacturer of baking soda. Write the balanced 
chemical equation for this. What happens when baking soda is heated? Write chemical 
equation. 
8. When we over eat we feel burning sensation in the stomach. State reason. Which substance 
can be used to nullify its effect? Give one example, state the property due to which we feel 
relief. 
Page 2


 
 
 
 
Summative Assessment-1 2014-2015 
Science 
Class – X 
 
 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 based on practical skills. 
Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are questions based on practical skills are two 
marks questions. 
 
 
Section – A 
1. Identify the chemical component that helps muscle cells to change their shape. 
2. Define magnetic field of a bar magnet. 
3. Name any two non-conventional sources of energy. 
4. The blue colour of copper Sulphate solution starts fading when zinc rod is dipped in it. State 
reason for this change and also write chemical equation for the reaction involved. 
5. A compound ‘Z’ is formed by the transfer of electrons from a metal ‘X’ to a non-metal ‘Y’. 
Identify the type of bond formed in the compound. List three general properties of the 
compound formed by such type of bonds. 
6. a) Name the respiratory pigment found in human beings. 
b) How is carbon dioxide transported in our body? 
7. List the raw materials needed for the manufacturer of baking soda. Write the balanced 
chemical equation for this. What happens when baking soda is heated? Write chemical 
equation. 
8. When we over eat we feel burning sensation in the stomach. State reason. Which substance 
can be used to nullify its effect? Give one example, state the property due to which we feel 
relief. 
 
 
 
 
9. a) Define the term pH of a solution. The pH of gastric juices of the sample collected from 
the stomach of two persons A and B were found to be 1 and 3 respectively. The gastric juice 
of which person is more acidic? 
b) Name one salt whose solution has pH more than 7 and one salt whose solution pH less 
than 7. 
10. Define a chemical reaction. Which observations help you to determine whether a chemical 
reaction has taken place? 
11. Design and activity and write steps to demonstrate the sunlight is essential for 
photosynthesis. 
12. Write the differences between positive phototropism and negative phototropism. Give an 
example of each. 
13. Name the connective tissue which transports food, oxygen and waste material in our body. 
Mention the components of this tissue. In which form are carbon dioxide and nitrogenous 
wastes transported. 
14. V-I graphs for two wires A and B are shown in the figure. if both the wires are made of the 
same material and are of equal thickness, which of the two is of more length? Give 
justification for your answer. 
 
15. A circular coil of N turns is placed vertically with its plane in east – west direction. A 
magnetic compass needle is placed at the centre of the coil. Will the magnetic needle show 
any deflection when current is passed through the coil? How will the deflection change as we 
turn the coil at 90° about a vertical axis keeping the magnetic needle fixed. What would 
happen to the deflection if the coil is further rotated through 90° ? 
16. Describe in brief three different ways to induced current in a coil. 
17. Solar cooker takes more time as compared to the LPG to boil potato or rice, yet Kunal uses 
solar cooker for such type of cooking: 
a) Why does Kunal use solar cooker instead of LPG? Give reason for your answer. 
b) Name the phenomenon which is responsible for obtaining high temperature in solar 
cooker? 
c) What is the motivation behind using solar cooker? 
18.  Draw a well-labelled diagram of a biogas plant. Why is slurry left behind considered useful. 
19. Give suitable reasons for the following statements: 
a) Rain water conducts electricity but distilled water does not. 
b) We feel burning sensation in the stomach when we overeat. 
c) A tarnished copper vessel regains its shine when rubbed with lemon. 
d) The crystals of washing soda change to white powder on exposure to air. 
Page 3


 
 
 
 
Summative Assessment-1 2014-2015 
Science 
Class – X 
 
 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 based on practical skills. 
Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are questions based on practical skills are two 
marks questions. 
 
 
Section – A 
1. Identify the chemical component that helps muscle cells to change their shape. 
2. Define magnetic field of a bar magnet. 
3. Name any two non-conventional sources of energy. 
4. The blue colour of copper Sulphate solution starts fading when zinc rod is dipped in it. State 
reason for this change and also write chemical equation for the reaction involved. 
5. A compound ‘Z’ is formed by the transfer of electrons from a metal ‘X’ to a non-metal ‘Y’. 
Identify the type of bond formed in the compound. List three general properties of the 
compound formed by such type of bonds. 
6. a) Name the respiratory pigment found in human beings. 
b) How is carbon dioxide transported in our body? 
7. List the raw materials needed for the manufacturer of baking soda. Write the balanced 
chemical equation for this. What happens when baking soda is heated? Write chemical 
equation. 
8. When we over eat we feel burning sensation in the stomach. State reason. Which substance 
can be used to nullify its effect? Give one example, state the property due to which we feel 
relief. 
 
 
 
 
9. a) Define the term pH of a solution. The pH of gastric juices of the sample collected from 
the stomach of two persons A and B were found to be 1 and 3 respectively. The gastric juice 
of which person is more acidic? 
b) Name one salt whose solution has pH more than 7 and one salt whose solution pH less 
than 7. 
10. Define a chemical reaction. Which observations help you to determine whether a chemical 
reaction has taken place? 
11. Design and activity and write steps to demonstrate the sunlight is essential for 
photosynthesis. 
12. Write the differences between positive phototropism and negative phototropism. Give an 
example of each. 
13. Name the connective tissue which transports food, oxygen and waste material in our body. 
Mention the components of this tissue. In which form are carbon dioxide and nitrogenous 
wastes transported. 
14. V-I graphs for two wires A and B are shown in the figure. if both the wires are made of the 
same material and are of equal thickness, which of the two is of more length? Give 
justification for your answer. 
 
15. A circular coil of N turns is placed vertically with its plane in east – west direction. A 
magnetic compass needle is placed at the centre of the coil. Will the magnetic needle show 
any deflection when current is passed through the coil? How will the deflection change as we 
turn the coil at 90° about a vertical axis keeping the magnetic needle fixed. What would 
happen to the deflection if the coil is further rotated through 90° ? 
16. Describe in brief three different ways to induced current in a coil. 
17. Solar cooker takes more time as compared to the LPG to boil potato or rice, yet Kunal uses 
solar cooker for such type of cooking: 
a) Why does Kunal use solar cooker instead of LPG? Give reason for your answer. 
b) Name the phenomenon which is responsible for obtaining high temperature in solar 
cooker? 
c) What is the motivation behind using solar cooker? 
18.  Draw a well-labelled diagram of a biogas plant. Why is slurry left behind considered useful. 
19. Give suitable reasons for the following statements: 
a) Rain water conducts electricity but distilled water does not. 
b) We feel burning sensation in the stomach when we overeat. 
c) A tarnished copper vessel regains its shine when rubbed with lemon. 
d) The crystals of washing soda change to white powder on exposure to air. 
 
 
 
 
e) An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium 
carbonate is basic. 
20. a) An ore, on heating in air, gives Sulphur dioxide gas. Name the method in each 
metallurgical step, that will be required to extract this metal from its ore. 
b) State which of the following reactions will take place or not, giving suitable reason for 
each. 
 
4 4
( ) ( ) ( ) ( ) Zn s CuSO aq ZnSO aq Cu s + ? + 
 
4 4
( ) ( ) ( ) ( ) Fe s ZnSO aq FeSO aq Zn s + ? + 
21. a) Explain feed-back mechanism for regulation of hormonal secretion in human body 
with the help of one example. 
b) State two different types of movement in plants. Mention two points of difference 
between them. 
22. Draw a labelled circuit diagram showing three resistors 
1
R , 
2
R and 
3
R connected in a parallel 
arrangement and this arrangement is connected in series with a battery (E), a rheostat (Rh), 
a plug key (K) and an ammeter (A). use this circuit and show with the help of a voltmeter that 
the same potential difference exists across each resistor of the parallel arrangement. List two 
precautions you would observe while performing the experiment. 
23. Distinguish between resistance and resistivity of a conductor. The resistors are generally 
made of thin wires of Eureka or Manganin while the wires used in connections are made 
comparatively thicker and are of copper or aluminium. Why? Give reason. What would 
happen to the resistance of a wire if it is stretched to double its length? Justify your answer. 
24. Explain what is an electromagnet. How does it differ from a permanent magnet? List three 
factors on which the strength of an electromagnet depends. Write its two most common 
applications. 
 
Section – B 
25. In which is responsible for the change of red litmus to blue when it is dipped in an alkali is:. 
a) Hydride 
b) Sodium 
c) Hydronium 
d) Hydroxyl 
26. Which one of the following is not required to find the pH of a solution? 
a) pH paper 
b) litmus paper 
c) universal indicator 
d) standard pH value chart 
27. Which of the following is a correct observation when water is added to lime? 
a) Only a hissing sound is heard from mixture 
b) Vigorous bubbling and a hissing sound 
c) Slow bubbling with no sound 
Page 4


 
 
 
 
Summative Assessment-1 2014-2015 
Science 
Class – X 
 
 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 based on practical skills. 
Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are questions based on practical skills are two 
marks questions. 
 
 
Section – A 
1. Identify the chemical component that helps muscle cells to change their shape. 
2. Define magnetic field of a bar magnet. 
3. Name any two non-conventional sources of energy. 
4. The blue colour of copper Sulphate solution starts fading when zinc rod is dipped in it. State 
reason for this change and also write chemical equation for the reaction involved. 
5. A compound ‘Z’ is formed by the transfer of electrons from a metal ‘X’ to a non-metal ‘Y’. 
Identify the type of bond formed in the compound. List three general properties of the 
compound formed by such type of bonds. 
6. a) Name the respiratory pigment found in human beings. 
b) How is carbon dioxide transported in our body? 
7. List the raw materials needed for the manufacturer of baking soda. Write the balanced 
chemical equation for this. What happens when baking soda is heated? Write chemical 
equation. 
8. When we over eat we feel burning sensation in the stomach. State reason. Which substance 
can be used to nullify its effect? Give one example, state the property due to which we feel 
relief. 
 
 
 
 
9. a) Define the term pH of a solution. The pH of gastric juices of the sample collected from 
the stomach of two persons A and B were found to be 1 and 3 respectively. The gastric juice 
of which person is more acidic? 
b) Name one salt whose solution has pH more than 7 and one salt whose solution pH less 
than 7. 
10. Define a chemical reaction. Which observations help you to determine whether a chemical 
reaction has taken place? 
11. Design and activity and write steps to demonstrate the sunlight is essential for 
photosynthesis. 
12. Write the differences between positive phototropism and negative phototropism. Give an 
example of each. 
13. Name the connective tissue which transports food, oxygen and waste material in our body. 
Mention the components of this tissue. In which form are carbon dioxide and nitrogenous 
wastes transported. 
14. V-I graphs for two wires A and B are shown in the figure. if both the wires are made of the 
same material and are of equal thickness, which of the two is of more length? Give 
justification for your answer. 
 
15. A circular coil of N turns is placed vertically with its plane in east – west direction. A 
magnetic compass needle is placed at the centre of the coil. Will the magnetic needle show 
any deflection when current is passed through the coil? How will the deflection change as we 
turn the coil at 90° about a vertical axis keeping the magnetic needle fixed. What would 
happen to the deflection if the coil is further rotated through 90° ? 
16. Describe in brief three different ways to induced current in a coil. 
17. Solar cooker takes more time as compared to the LPG to boil potato or rice, yet Kunal uses 
solar cooker for such type of cooking: 
a) Why does Kunal use solar cooker instead of LPG? Give reason for your answer. 
b) Name the phenomenon which is responsible for obtaining high temperature in solar 
cooker? 
c) What is the motivation behind using solar cooker? 
18.  Draw a well-labelled diagram of a biogas plant. Why is slurry left behind considered useful. 
19. Give suitable reasons for the following statements: 
a) Rain water conducts electricity but distilled water does not. 
b) We feel burning sensation in the stomach when we overeat. 
c) A tarnished copper vessel regains its shine when rubbed with lemon. 
d) The crystals of washing soda change to white powder on exposure to air. 
 
 
 
 
e) An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium 
carbonate is basic. 
20. a) An ore, on heating in air, gives Sulphur dioxide gas. Name the method in each 
metallurgical step, that will be required to extract this metal from its ore. 
b) State which of the following reactions will take place or not, giving suitable reason for 
each. 
 
4 4
( ) ( ) ( ) ( ) Zn s CuSO aq ZnSO aq Cu s + ? + 
 
4 4
( ) ( ) ( ) ( ) Fe s ZnSO aq FeSO aq Zn s + ? + 
21. a) Explain feed-back mechanism for regulation of hormonal secretion in human body 
with the help of one example. 
b) State two different types of movement in plants. Mention two points of difference 
between them. 
22. Draw a labelled circuit diagram showing three resistors 
1
R , 
2
R and 
3
R connected in a parallel 
arrangement and this arrangement is connected in series with a battery (E), a rheostat (Rh), 
a plug key (K) and an ammeter (A). use this circuit and show with the help of a voltmeter that 
the same potential difference exists across each resistor of the parallel arrangement. List two 
precautions you would observe while performing the experiment. 
23. Distinguish between resistance and resistivity of a conductor. The resistors are generally 
made of thin wires of Eureka or Manganin while the wires used in connections are made 
comparatively thicker and are of copper or aluminium. Why? Give reason. What would 
happen to the resistance of a wire if it is stretched to double its length? Justify your answer. 
24. Explain what is an electromagnet. How does it differ from a permanent magnet? List three 
factors on which the strength of an electromagnet depends. Write its two most common 
applications. 
 
Section – B 
25. In which is responsible for the change of red litmus to blue when it is dipped in an alkali is:. 
a) Hydride 
b) Sodium 
c) Hydronium 
d) Hydroxyl 
26. Which one of the following is not required to find the pH of a solution? 
a) pH paper 
b) litmus paper 
c) universal indicator 
d) standard pH value chart 
27. Which of the following is a correct observation when water is added to lime? 
a) Only a hissing sound is heard from mixture 
b) Vigorous bubbling and a hissing sound 
c) Slow bubbling with no sound 
 
 
 
 
d) Vigorous bubbling with evolution of heat and a hissing sound 
28. Renu added some iron fillings to 100 ml of copper Sulphate solution. After sometime she 
observed that the colour of the solution changed and noticed some deposits on the iron 
fillings. The colour of the solution and the coating would respectively be: 
a) Brown and blue 
b) Red and blue 
c) Green and reddish-brown 
d) Yellow and green 
29. On adding small strip of ‘Aluminium to zinc Sulphate solution Sushma observed a silvery 
white coating on aluminium, correct inference drawn by her would be- 
a) Zn displaces Al from its salt solution 
b) Al displaces Zn from its salt solution 
c) Al is less reactive than Zinc 
d) Al and Zn are equally reactive 
30. In which of the circuits, the voltmeter/ammeter is likely to be damaged, on plugging the key, 
 
a) I 
b) II 
c) III 
d) IV 
31. A student found that when a resistance off 3? was joined with 3V battery as per fig shown 
below, the current flowing through it was 1A. He then joined another resistance of 6? in 
parallel with 3? resistance. The reading in the ammeter will now be 
 
a) 9A 
b) 1.5A 
c) 1A 
Page 5


 
 
 
 
Summative Assessment-1 2014-2015 
Science 
Class – X 
 
 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 based on practical skills. 
Each question is a one mark question. 
i) Question number 34 to 36 in Section – B are questions based on practical skills are two 
marks questions. 
 
 
Section – A 
1. Identify the chemical component that helps muscle cells to change their shape. 
2. Define magnetic field of a bar magnet. 
3. Name any two non-conventional sources of energy. 
4. The blue colour of copper Sulphate solution starts fading when zinc rod is dipped in it. State 
reason for this change and also write chemical equation for the reaction involved. 
5. A compound ‘Z’ is formed by the transfer of electrons from a metal ‘X’ to a non-metal ‘Y’. 
Identify the type of bond formed in the compound. List three general properties of the 
compound formed by such type of bonds. 
6. a) Name the respiratory pigment found in human beings. 
b) How is carbon dioxide transported in our body? 
7. List the raw materials needed for the manufacturer of baking soda. Write the balanced 
chemical equation for this. What happens when baking soda is heated? Write chemical 
equation. 
8. When we over eat we feel burning sensation in the stomach. State reason. Which substance 
can be used to nullify its effect? Give one example, state the property due to which we feel 
relief. 
 
 
 
 
9. a) Define the term pH of a solution. The pH of gastric juices of the sample collected from 
the stomach of two persons A and B were found to be 1 and 3 respectively. The gastric juice 
of which person is more acidic? 
b) Name one salt whose solution has pH more than 7 and one salt whose solution pH less 
than 7. 
10. Define a chemical reaction. Which observations help you to determine whether a chemical 
reaction has taken place? 
11. Design and activity and write steps to demonstrate the sunlight is essential for 
photosynthesis. 
12. Write the differences between positive phototropism and negative phototropism. Give an 
example of each. 
13. Name the connective tissue which transports food, oxygen and waste material in our body. 
Mention the components of this tissue. In which form are carbon dioxide and nitrogenous 
wastes transported. 
14. V-I graphs for two wires A and B are shown in the figure. if both the wires are made of the 
same material and are of equal thickness, which of the two is of more length? Give 
justification for your answer. 
 
15. A circular coil of N turns is placed vertically with its plane in east – west direction. A 
magnetic compass needle is placed at the centre of the coil. Will the magnetic needle show 
any deflection when current is passed through the coil? How will the deflection change as we 
turn the coil at 90° about a vertical axis keeping the magnetic needle fixed. What would 
happen to the deflection if the coil is further rotated through 90° ? 
16. Describe in brief three different ways to induced current in a coil. 
17. Solar cooker takes more time as compared to the LPG to boil potato or rice, yet Kunal uses 
solar cooker for such type of cooking: 
a) Why does Kunal use solar cooker instead of LPG? Give reason for your answer. 
b) Name the phenomenon which is responsible for obtaining high temperature in solar 
cooker? 
c) What is the motivation behind using solar cooker? 
18.  Draw a well-labelled diagram of a biogas plant. Why is slurry left behind considered useful. 
19. Give suitable reasons for the following statements: 
a) Rain water conducts electricity but distilled water does not. 
b) We feel burning sensation in the stomach when we overeat. 
c) A tarnished copper vessel regains its shine when rubbed with lemon. 
d) The crystals of washing soda change to white powder on exposure to air. 
 
 
 
 
e) An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium 
carbonate is basic. 
20. a) An ore, on heating in air, gives Sulphur dioxide gas. Name the method in each 
metallurgical step, that will be required to extract this metal from its ore. 
b) State which of the following reactions will take place or not, giving suitable reason for 
each. 
 
4 4
( ) ( ) ( ) ( ) Zn s CuSO aq ZnSO aq Cu s + ? + 
 
4 4
( ) ( ) ( ) ( ) Fe s ZnSO aq FeSO aq Zn s + ? + 
21. a) Explain feed-back mechanism for regulation of hormonal secretion in human body 
with the help of one example. 
b) State two different types of movement in plants. Mention two points of difference 
between them. 
22. Draw a labelled circuit diagram showing three resistors 
1
R , 
2
R and 
3
R connected in a parallel 
arrangement and this arrangement is connected in series with a battery (E), a rheostat (Rh), 
a plug key (K) and an ammeter (A). use this circuit and show with the help of a voltmeter that 
the same potential difference exists across each resistor of the parallel arrangement. List two 
precautions you would observe while performing the experiment. 
23. Distinguish between resistance and resistivity of a conductor. The resistors are generally 
made of thin wires of Eureka or Manganin while the wires used in connections are made 
comparatively thicker and are of copper or aluminium. Why? Give reason. What would 
happen to the resistance of a wire if it is stretched to double its length? Justify your answer. 
24. Explain what is an electromagnet. How does it differ from a permanent magnet? List three 
factors on which the strength of an electromagnet depends. Write its two most common 
applications. 
 
Section – B 
25. In which is responsible for the change of red litmus to blue when it is dipped in an alkali is:. 
a) Hydride 
b) Sodium 
c) Hydronium 
d) Hydroxyl 
26. Which one of the following is not required to find the pH of a solution? 
a) pH paper 
b) litmus paper 
c) universal indicator 
d) standard pH value chart 
27. Which of the following is a correct observation when water is added to lime? 
a) Only a hissing sound is heard from mixture 
b) Vigorous bubbling and a hissing sound 
c) Slow bubbling with no sound 
 
 
 
 
d) Vigorous bubbling with evolution of heat and a hissing sound 
28. Renu added some iron fillings to 100 ml of copper Sulphate solution. After sometime she 
observed that the colour of the solution changed and noticed some deposits on the iron 
fillings. The colour of the solution and the coating would respectively be: 
a) Brown and blue 
b) Red and blue 
c) Green and reddish-brown 
d) Yellow and green 
29. On adding small strip of ‘Aluminium to zinc Sulphate solution Sushma observed a silvery 
white coating on aluminium, correct inference drawn by her would be- 
a) Zn displaces Al from its salt solution 
b) Al displaces Zn from its salt solution 
c) Al is less reactive than Zinc 
d) Al and Zn are equally reactive 
30. In which of the circuits, the voltmeter/ammeter is likely to be damaged, on plugging the key, 
 
a) I 
b) II 
c) III 
d) IV 
31. A student found that when a resistance off 3? was joined with 3V battery as per fig shown 
below, the current flowing through it was 1A. He then joined another resistance of 6? in 
parallel with 3? resistance. The reading in the ammeter will now be 
 
a) 9A 
b) 1.5A 
c) 1A 
 
 
 
 
d) 6A 
32. In the experiment to show that light is necessary for photosynthesis’, the reason for boiling 
the leaf in alcohol is to: 
a) Kill its cells and make it soft 
b) Bleach it so that it stops photosynthesizing 
c) Remove chlorophyll as it interferes with the iodine test 
d) Activate chlorophyll 
33. Given below are a set of things. Choose the correct one to set up an experiment to show that 
2
CO is given out during respiration: 
a) Beaker, conical flask, rubber stopper, delivery tube, water, KOH, germinating seeds 
b) Beaker, conical flask, rubber stopper, germinating seeds, water and 
4
KMmO 
c) Beaker, conical flask, rubber stopper, germinating seeds, water 
d) Beaker, conical flask, rubber stopper, water, KOH 
34. Aqueous solution of sodium Sulphate and barium chloride are filled in two test tubes A and B 
respectively. State the colour of two solutions. What is likely to happen if these solutions are 
mixed together. Justify your answer. 
 
35. What is likely to happen and how it would effect the value of resistance if we pass the current 
for a longer time? 
36. Identify the observed various parts of temporary mount of well stained leaf peel, when 
focused under the high power of a microscope.