Science Past Year Paper SA-1(Set -4) - 2014, Class 10, CBSE Class 10 Notes | EduRev

Science Class 10

Created by: Dr Manju Sen

Class 10 : Science Past Year Paper SA-1(Set -4) - 2014, Class 10, CBSE Class 10 Notes | EduRev

 Page 1


 
 
 
 
Summative Assessement-1 Examination 2014 
 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 the 
sections. 
b) All questions are compulsory. 
c) Questions 1 to 3 are one mark question of section A. 
d) Questions 4 to 6 carry two marks each of section A. 
e) Questions 7 to 18 carry three marks each of section A. 
f) Questions 19 to 24 carry five marks each of section A. 
g) Questions 25 to 33 carry one mark each of section B. 
h) Questions 34 to 36 are two marks each of section A.. 
 
 
Section – A 
1. Identify the category in which the organisms using carbon dioxide and water as food are 
placed. 
2. Define 1 Watt. 
3. Why is a solar cooker painted black from outside? 
4. Name the chemical which is injected into the skin of a person during 
a) Honey bee’s sting 
b) The nettle leaf sting. How can the effect of these stings be neutralized? 
5. Rahul has been collecting copper coins and silver coins. One day he observed a green coating 
on copper coins and a black coating on silver coins. State the chemical phenomenon 
responsible for these coatings and also write chemical names of each coating. 
6. How is our brain double-protected against injuries and shocks? 
7. Identify the type of chemical reactions in the following processes: 
a) Barium chloride solution is mixed with copper sulphate solution and a write precipitate is 
formed. 
b) On heating copper powder in a china dish, the surface of copper powder become black. 
c) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas 
having smell of burning Sulphur is evolved. 
d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour 
and blue colour of copper sulphate solution fades away. 
e) Quicklime reacts vigorously with water releasing large amount of heat. 
f) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is 
formed. 
Page 2


 
 
 
 
Summative Assessement-1 Examination 2014 
 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 the 
sections. 
b) All questions are compulsory. 
c) Questions 1 to 3 are one mark question of section A. 
d) Questions 4 to 6 carry two marks each of section A. 
e) Questions 7 to 18 carry three marks each of section A. 
f) Questions 19 to 24 carry five marks each of section A. 
g) Questions 25 to 33 carry one mark each of section B. 
h) Questions 34 to 36 are two marks each of section A.. 
 
 
Section – A 
1. Identify the category in which the organisms using carbon dioxide and water as food are 
placed. 
2. Define 1 Watt. 
3. Why is a solar cooker painted black from outside? 
4. Name the chemical which is injected into the skin of a person during 
a) Honey bee’s sting 
b) The nettle leaf sting. How can the effect of these stings be neutralized? 
5. Rahul has been collecting copper coins and silver coins. One day he observed a green coating 
on copper coins and a black coating on silver coins. State the chemical phenomenon 
responsible for these coatings and also write chemical names of each coating. 
6. How is our brain double-protected against injuries and shocks? 
7. Identify the type of chemical reactions in the following processes: 
a) Barium chloride solution is mixed with copper sulphate solution and a write precipitate is 
formed. 
b) On heating copper powder in a china dish, the surface of copper powder become black. 
c) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas 
having smell of burning Sulphur is evolved. 
d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour 
and blue colour of copper sulphate solution fades away. 
e) Quicklime reacts vigorously with water releasing large amount of heat. 
f) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is 
formed. 
 
 
 
 
8. 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 and3 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 has pH less 
that 7. 
9. Define water of crystallization. Explain with the help of an activity that copper sulphate 
crystals contain water of crystallization. 
10. Write chemical equations for the following reactions: 
a) A piece of calcium metal is dropped in water 
b) Steam is passed over red hot iron 
c) Zinc suphide is heated in air 
11. Define hormone. Name the hormone secreted by thyroid gland. Write its function why is it 
advised to use iodised salt? 
12. Compare alveoli in the lungs and nephrons in the kidneys with respect to their structure and 
functioning. 
13. Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
14. For the current  carrying solenoid shown, draw magnetic field lines, and giving reason 
explain. Out of the three points A, B and C at which point the field strength is maximum and at 
which point it is minimum. 
 
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. Draw a V-I graph based on the following data: 
V(in volts) 1 2 3 4 5 
I(in amperes) 0.25 0.50 0.75 1.0 1.25 
What would be the value of V/I ratio when the potential difference (V) across the resistor is 
3.6V? 
17. Nishant went to see a thermal power plant where large amount of fossil fuels are burnt every 
day, to heat water to produce steam. This steam runs the turbine of generator to generate 
electricity. His friend Akshit explained that this technique of generating electricity has many 
harmful effects over to establish the solar cell panel by using cells to obtain electricity. 
a) Do you agree with the explanation given by Akshit? Name the element used to fabricate 
solar cell. 
b) Write two advantages of solar cells. 
c) What values are demonstrated by Akshit? 
18. List any three parameters, which categories any source of energy as a good source of energy? 
Page 3


 
 
 
 
Summative Assessement-1 Examination 2014 
 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 the 
sections. 
b) All questions are compulsory. 
c) Questions 1 to 3 are one mark question of section A. 
d) Questions 4 to 6 carry two marks each of section A. 
e) Questions 7 to 18 carry three marks each of section A. 
f) Questions 19 to 24 carry five marks each of section A. 
g) Questions 25 to 33 carry one mark each of section B. 
h) Questions 34 to 36 are two marks each of section A.. 
 
 
Section – A 
1. Identify the category in which the organisms using carbon dioxide and water as food are 
placed. 
2. Define 1 Watt. 
3. Why is a solar cooker painted black from outside? 
4. Name the chemical which is injected into the skin of a person during 
a) Honey bee’s sting 
b) The nettle leaf sting. How can the effect of these stings be neutralized? 
5. Rahul has been collecting copper coins and silver coins. One day he observed a green coating 
on copper coins and a black coating on silver coins. State the chemical phenomenon 
responsible for these coatings and also write chemical names of each coating. 
6. How is our brain double-protected against injuries and shocks? 
7. Identify the type of chemical reactions in the following processes: 
a) Barium chloride solution is mixed with copper sulphate solution and a write precipitate is 
formed. 
b) On heating copper powder in a china dish, the surface of copper powder become black. 
c) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas 
having smell of burning Sulphur is evolved. 
d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour 
and blue colour of copper sulphate solution fades away. 
e) Quicklime reacts vigorously with water releasing large amount of heat. 
f) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is 
formed. 
 
 
 
 
8. 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 and3 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 has pH less 
that 7. 
9. Define water of crystallization. Explain with the help of an activity that copper sulphate 
crystals contain water of crystallization. 
10. Write chemical equations for the following reactions: 
a) A piece of calcium metal is dropped in water 
b) Steam is passed over red hot iron 
c) Zinc suphide is heated in air 
11. Define hormone. Name the hormone secreted by thyroid gland. Write its function why is it 
advised to use iodised salt? 
12. Compare alveoli in the lungs and nephrons in the kidneys with respect to their structure and 
functioning. 
13. Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
14. For the current  carrying solenoid shown, draw magnetic field lines, and giving reason 
explain. Out of the three points A, B and C at which point the field strength is maximum and at 
which point it is minimum. 
 
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. Draw a V-I graph based on the following data: 
V(in volts) 1 2 3 4 5 
I(in amperes) 0.25 0.50 0.75 1.0 1.25 
What would be the value of V/I ratio when the potential difference (V) across the resistor is 
3.6V? 
17. Nishant went to see a thermal power plant where large amount of fossil fuels are burnt every 
day, to heat water to produce steam. This steam runs the turbine of generator to generate 
electricity. His friend Akshit explained that this technique of generating electricity has many 
harmful effects over to establish the solar cell panel by using cells to obtain electricity. 
a) Do you agree with the explanation given by Akshit? Name the element used to fabricate 
solar cell. 
b) Write two advantages of solar cells. 
c) What values are demonstrated by Akshit? 
18. List any three parameters, which categories any source of energy as a good source of energy? 
 
 
 
 
19. Define, rancidity. What kind of substances are used to prevent rancidity? Explain any three 
methods to prevent rancidity. 
20. A) Write three properties each of acids and bases. 
B) How will you show with an example that metal oxides are basic in nature? Give chemical 
equation also. 
21. A) Define reflex action. State its significance. 
B) How do plants respond to external stimuli? 
22. Explain the meanings of the words “electromagnetic” and “induction” in the term 
electromagnetic induction. List three factors on which the value of induced current produced 
in a circuit depends. Name the sate the rule used to determine the direction of induced 
current. State one practical application of this phenomenon in everyday life. 
23. A) Write three distinguish features between an alternating current and a direct current. 
B) A current through a horizontal power line flows in east to west direction. What is the 
direction of magnetic field at a point directly below it and at a point directly above it? 
Name the rule you have applied in this case. 
24. Study the following current – time graphs from two different sources: 
 
a) Use above graphs to list two differences between the current in two cases 
b) Name the type of current in two cases 
c) Identify one source each for these currents 
d) What is meant by the statement that “the frequency of current in India is 50 Hz”? 
 
Section – B 
25. Which of the following solutions with same concentrations will have lowest pH? 
a) 
2 4
H SO 
b) HCOOH 
c) 
3
CH COOH 
d) 
2 3
H CO 
26. While doing an experiment a student added drop of given solution on pH paper and observed 
that pH paper turned to blue. He inferred that given solution is: 
a) dilute
3
CH COOH 
b) Conc. HCl 
c) dilute HCl 
d) dilute solution of 
3 3
Na CO 
27. Slaked lime is used for white washing. After two or three days of white washing it gives shiny 
finish to walls due to the formation of the compound: 
Page 4


 
 
 
 
Summative Assessement-1 Examination 2014 
 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 the 
sections. 
b) All questions are compulsory. 
c) Questions 1 to 3 are one mark question of section A. 
d) Questions 4 to 6 carry two marks each of section A. 
e) Questions 7 to 18 carry three marks each of section A. 
f) Questions 19 to 24 carry five marks each of section A. 
g) Questions 25 to 33 carry one mark each of section B. 
h) Questions 34 to 36 are two marks each of section A.. 
 
 
Section – A 
1. Identify the category in which the organisms using carbon dioxide and water as food are 
placed. 
2. Define 1 Watt. 
3. Why is a solar cooker painted black from outside? 
4. Name the chemical which is injected into the skin of a person during 
a) Honey bee’s sting 
b) The nettle leaf sting. How can the effect of these stings be neutralized? 
5. Rahul has been collecting copper coins and silver coins. One day he observed a green coating 
on copper coins and a black coating on silver coins. State the chemical phenomenon 
responsible for these coatings and also write chemical names of each coating. 
6. How is our brain double-protected against injuries and shocks? 
7. Identify the type of chemical reactions in the following processes: 
a) Barium chloride solution is mixed with copper sulphate solution and a write precipitate is 
formed. 
b) On heating copper powder in a china dish, the surface of copper powder become black. 
c) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas 
having smell of burning Sulphur is evolved. 
d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour 
and blue colour of copper sulphate solution fades away. 
e) Quicklime reacts vigorously with water releasing large amount of heat. 
f) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is 
formed. 
 
 
 
 
8. 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 and3 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 has pH less 
that 7. 
9. Define water of crystallization. Explain with the help of an activity that copper sulphate 
crystals contain water of crystallization. 
10. Write chemical equations for the following reactions: 
a) A piece of calcium metal is dropped in water 
b) Steam is passed over red hot iron 
c) Zinc suphide is heated in air 
11. Define hormone. Name the hormone secreted by thyroid gland. Write its function why is it 
advised to use iodised salt? 
12. Compare alveoli in the lungs and nephrons in the kidneys with respect to their structure and 
functioning. 
13. Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
14. For the current  carrying solenoid shown, draw magnetic field lines, and giving reason 
explain. Out of the three points A, B and C at which point the field strength is maximum and at 
which point it is minimum. 
 
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. Draw a V-I graph based on the following data: 
V(in volts) 1 2 3 4 5 
I(in amperes) 0.25 0.50 0.75 1.0 1.25 
What would be the value of V/I ratio when the potential difference (V) across the resistor is 
3.6V? 
17. Nishant went to see a thermal power plant where large amount of fossil fuels are burnt every 
day, to heat water to produce steam. This steam runs the turbine of generator to generate 
electricity. His friend Akshit explained that this technique of generating electricity has many 
harmful effects over to establish the solar cell panel by using cells to obtain electricity. 
a) Do you agree with the explanation given by Akshit? Name the element used to fabricate 
solar cell. 
b) Write two advantages of solar cells. 
c) What values are demonstrated by Akshit? 
18. List any three parameters, which categories any source of energy as a good source of energy? 
 
 
 
 
19. Define, rancidity. What kind of substances are used to prevent rancidity? Explain any three 
methods to prevent rancidity. 
20. A) Write three properties each of acids and bases. 
B) How will you show with an example that metal oxides are basic in nature? Give chemical 
equation also. 
21. A) Define reflex action. State its significance. 
B) How do plants respond to external stimuli? 
22. Explain the meanings of the words “electromagnetic” and “induction” in the term 
electromagnetic induction. List three factors on which the value of induced current produced 
in a circuit depends. Name the sate the rule used to determine the direction of induced 
current. State one practical application of this phenomenon in everyday life. 
23. A) Write three distinguish features between an alternating current and a direct current. 
B) A current through a horizontal power line flows in east to west direction. What is the 
direction of magnetic field at a point directly below it and at a point directly above it? 
Name the rule you have applied in this case. 
24. Study the following current – time graphs from two different sources: 
 
a) Use above graphs to list two differences between the current in two cases 
b) Name the type of current in two cases 
c) Identify one source each for these currents 
d) What is meant by the statement that “the frequency of current in India is 50 Hz”? 
 
Section – B 
25. Which of the following solutions with same concentrations will have lowest pH? 
a) 
2 4
H SO 
b) HCOOH 
c) 
3
CH COOH 
d) 
2 3
H CO 
26. While doing an experiment a student added drop of given solution on pH paper and observed 
that pH paper turned to blue. He inferred that given solution is: 
a) dilute
3
CH COOH 
b) Conc. HCl 
c) dilute HCl 
d) dilute solution of 
3 3
Na CO 
27. Slaked lime is used for white washing. After two or three days of white washing it gives shiny 
finish to walls due to the formation of the compound: 
 
 
 
 
a) 
3
CaCO 
b) CaO 
c) 
2
CaCl 
d) 
4
CaSO 
28. The set of colourless solution is: 
a) 
4( ) 4( )
,
aq aq
ZnSO FeSO 
b) 
2 4 3( ) 4( )
( ) ,
aq aq
Al SO CuSO 
c) 
2 4 3( ) 4( )
( ) ,
aq aq
Al SO FeSO 
d) 
4( ) 2 4 3( )
, ( )
aq aq
ZnSO Al SO 
29. Debo added a few Zn granules to 50 ml. of a solution of 
4
CuSO in a test tube. The correct 
observation made by him for change of solution is: 
a) Colourless solution turned blue 
b) Blue solution turned colourless 
c) Pale green solution turned colourless 
d) Blue solution turned pale green 
30. The equivalent resistance of a series combination of two resistors is X O . If the resistors are 
of 10O and 40O respectively the value of X will be: 
a) 10O 
b) 20O 
c) 50O 
d) 40O 
31. The resultant resistance in a parallel combination of there resistances 1 ,2 3 and O O O , is  
a) 3 /11O 
b) 4 /11O 
c) 5 /11O 
d) 6 /11O 
32. During an experiment on photosynthesis, in the step shown in figure below, the alcohol turns 
green because: 
 
a) Of heating 
b) Chlorophyll being organic in nature, dissolve in it 
c) Of the impurities of the surroundings 
d) Cells of leaf disintegrate in it 
Page 5


 
 
 
 
Summative Assessement-1 Examination 2014 
 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 the 
sections. 
b) All questions are compulsory. 
c) Questions 1 to 3 are one mark question of section A. 
d) Questions 4 to 6 carry two marks each of section A. 
e) Questions 7 to 18 carry three marks each of section A. 
f) Questions 19 to 24 carry five marks each of section A. 
g) Questions 25 to 33 carry one mark each of section B. 
h) Questions 34 to 36 are two marks each of section A.. 
 
 
Section – A 
1. Identify the category in which the organisms using carbon dioxide and water as food are 
placed. 
2. Define 1 Watt. 
3. Why is a solar cooker painted black from outside? 
4. Name the chemical which is injected into the skin of a person during 
a) Honey bee’s sting 
b) The nettle leaf sting. How can the effect of these stings be neutralized? 
5. Rahul has been collecting copper coins and silver coins. One day he observed a green coating 
on copper coins and a black coating on silver coins. State the chemical phenomenon 
responsible for these coatings and also write chemical names of each coating. 
6. How is our brain double-protected against injuries and shocks? 
7. Identify the type of chemical reactions in the following processes: 
a) Barium chloride solution is mixed with copper sulphate solution and a write precipitate is 
formed. 
b) On heating copper powder in a china dish, the surface of copper powder become black. 
c) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas 
having smell of burning Sulphur is evolved. 
d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour 
and blue colour of copper sulphate solution fades away. 
e) Quicklime reacts vigorously with water releasing large amount of heat. 
f) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is 
formed. 
 
 
 
 
8. 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 and3 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 has pH less 
that 7. 
9. Define water of crystallization. Explain with the help of an activity that copper sulphate 
crystals contain water of crystallization. 
10. Write chemical equations for the following reactions: 
a) A piece of calcium metal is dropped in water 
b) Steam is passed over red hot iron 
c) Zinc suphide is heated in air 
11. Define hormone. Name the hormone secreted by thyroid gland. Write its function why is it 
advised to use iodised salt? 
12. Compare alveoli in the lungs and nephrons in the kidneys with respect to their structure and 
functioning. 
13. Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
14. For the current  carrying solenoid shown, draw magnetic field lines, and giving reason 
explain. Out of the three points A, B and C at which point the field strength is maximum and at 
which point it is minimum. 
 
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. Draw a V-I graph based on the following data: 
V(in volts) 1 2 3 4 5 
I(in amperes) 0.25 0.50 0.75 1.0 1.25 
What would be the value of V/I ratio when the potential difference (V) across the resistor is 
3.6V? 
17. Nishant went to see a thermal power plant where large amount of fossil fuels are burnt every 
day, to heat water to produce steam. This steam runs the turbine of generator to generate 
electricity. His friend Akshit explained that this technique of generating electricity has many 
harmful effects over to establish the solar cell panel by using cells to obtain electricity. 
a) Do you agree with the explanation given by Akshit? Name the element used to fabricate 
solar cell. 
b) Write two advantages of solar cells. 
c) What values are demonstrated by Akshit? 
18. List any three parameters, which categories any source of energy as a good source of energy? 
 
 
 
 
19. Define, rancidity. What kind of substances are used to prevent rancidity? Explain any three 
methods to prevent rancidity. 
20. A) Write three properties each of acids and bases. 
B) How will you show with an example that metal oxides are basic in nature? Give chemical 
equation also. 
21. A) Define reflex action. State its significance. 
B) How do plants respond to external stimuli? 
22. Explain the meanings of the words “electromagnetic” and “induction” in the term 
electromagnetic induction. List three factors on which the value of induced current produced 
in a circuit depends. Name the sate the rule used to determine the direction of induced 
current. State one practical application of this phenomenon in everyday life. 
23. A) Write three distinguish features between an alternating current and a direct current. 
B) A current through a horizontal power line flows in east to west direction. What is the 
direction of magnetic field at a point directly below it and at a point directly above it? 
Name the rule you have applied in this case. 
24. Study the following current – time graphs from two different sources: 
 
a) Use above graphs to list two differences between the current in two cases 
b) Name the type of current in two cases 
c) Identify one source each for these currents 
d) What is meant by the statement that “the frequency of current in India is 50 Hz”? 
 
Section – B 
25. Which of the following solutions with same concentrations will have lowest pH? 
a) 
2 4
H SO 
b) HCOOH 
c) 
3
CH COOH 
d) 
2 3
H CO 
26. While doing an experiment a student added drop of given solution on pH paper and observed 
that pH paper turned to blue. He inferred that given solution is: 
a) dilute
3
CH COOH 
b) Conc. HCl 
c) dilute HCl 
d) dilute solution of 
3 3
Na CO 
27. Slaked lime is used for white washing. After two or three days of white washing it gives shiny 
finish to walls due to the formation of the compound: 
 
 
 
 
a) 
3
CaCO 
b) CaO 
c) 
2
CaCl 
d) 
4
CaSO 
28. The set of colourless solution is: 
a) 
4( ) 4( )
,
aq aq
ZnSO FeSO 
b) 
2 4 3( ) 4( )
( ) ,
aq aq
Al SO CuSO 
c) 
2 4 3( ) 4( )
( ) ,
aq aq
Al SO FeSO 
d) 
4( ) 2 4 3( )
, ( )
aq aq
ZnSO Al SO 
29. Debo added a few Zn granules to 50 ml. of a solution of 
4
CuSO in a test tube. The correct 
observation made by him for change of solution is: 
a) Colourless solution turned blue 
b) Blue solution turned colourless 
c) Pale green solution turned colourless 
d) Blue solution turned pale green 
30. The equivalent resistance of a series combination of two resistors is X O . If the resistors are 
of 10O and 40O respectively the value of X will be: 
a) 10O 
b) 20O 
c) 50O 
d) 40O 
31. The resultant resistance in a parallel combination of there resistances 1 ,2 3 and O O O , is  
a) 3 /11O 
b) 4 /11O 
c) 5 /11O 
d) 6 /11O 
32. During an experiment on photosynthesis, in the step shown in figure below, the alcohol turns 
green because: 
 
a) Of heating 
b) Chlorophyll being organic in nature, dissolve in it 
c) Of the impurities of the surroundings 
d) Cells of leaf disintegrate in it 
 
 
 
 
33. The role of potassium hydroxide in the experiment to show that 
2
CO is given out during 
respiration is 
a) To absorb oxygen 
b) To absorb carbon dioxide 
c) To create a partial vacuum in the conical flask 
d) Both (b) and (c) 
34. A student prepares aqueous solutions of the following salts: 
Copper sulphate, ferrous sulphate, Sodium sulphate, Barium chloride 
Write the colour of each solution thus formed. 
35. Draw a labelled circuit diagram to study the dependence of current (I) on the potential 
difference (V) across a resistor. 
36. Draw a labelled diagram of a stomatal apparatus with open stomatal pore. 
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