Class 10 Science - Previous Year Paper SA 1 Set-7 2016

 Page 1


 
 
 
 
GYAN SAGAR PUBIC SCHOOL 
SUMMATIVE ASSESSMENT – I, 2016 – 17 
SCIENE 
Class: X 
Time: 3Hrs.           M.M: 90 
 
General instructions:  
1. The question paper comprises of two Section A and B. You are to attempt both the 
section. 
2. All questions are compulsory 
3. All questions of Section A and all questions of Section B are to be attempted separately. 
4. Question numbers 1 to 3 in Section A are one mark questions. These are to be answered 
in on word or in one sentence. 
5. Question numbers 4 to 6 in Section A are three marks questions. These are to be 
answered in about 30 words each. 
6. Question numbers 7 to 18 in Section A are three marks questions. These are to be 
answered in about 50 words each. 
7. Question numbers 19 to 24 in Section A are five marks questions. These are to be 
answered in about 70 words each. 
8. Question numbers 25 to 33 in section B are multiple choice questions based on practical 
skills. Each question is a one mark question. You are select one most appropriate 
response out of the four provided to you. 
9. Question numbers 34 to 36 in Section B are questions based on practical skills. Each 
question is of two marks. 
 
SECTION A 
1. In case of a spinal cord injury, identify the signals that will get disrupted. 
 
2. Define the SI unit of Resistance. 
 
3. Write any two applications of biogas. 
 
4. List three products obtained in the chlor – alkali process. Which of these products is used 
for the manufacture of bleaching powder? 
 
5. An element ‘X’ forms an oxide. This oxides reacts with HCI as well as NaOH to form salt 
and water. Name the kind of this oxide and give one example. Write its chemical reaction 
either with HCI or NaOH. 
 
6. (i) Write the balanced chemical equation for the process of photosynthesis. 
 (ii) When do the desert plants takeup carbon dioxide and perform photosynthesis? 
 
7. (a) What are the bases which are soluble in water called? 
 (b) Write any four uses of bases. 
 
Page 2


 
 
 
 
GYAN SAGAR PUBIC SCHOOL 
SUMMATIVE ASSESSMENT – I, 2016 – 17 
SCIENE 
Class: X 
Time: 3Hrs.           M.M: 90 
 
General instructions:  
1. The question paper comprises of two Section A and B. You are to attempt both the 
section. 
2. All questions are compulsory 
3. All questions of Section A and all questions of Section B are to be attempted separately. 
4. Question numbers 1 to 3 in Section A are one mark questions. These are to be answered 
in on word or in one sentence. 
5. Question numbers 4 to 6 in Section A are three marks questions. These are to be 
answered in about 30 words each. 
6. Question numbers 7 to 18 in Section A are three marks questions. These are to be 
answered in about 50 words each. 
7. Question numbers 19 to 24 in Section A are five marks questions. These are to be 
answered in about 70 words each. 
8. Question numbers 25 to 33 in section B are multiple choice questions based on practical 
skills. Each question is a one mark question. You are select one most appropriate 
response out of the four provided to you. 
9. Question numbers 34 to 36 in Section B are questions based on practical skills. Each 
question is of two marks. 
 
SECTION A 
1. In case of a spinal cord injury, identify the signals that will get disrupted. 
 
2. Define the SI unit of Resistance. 
 
3. Write any two applications of biogas. 
 
4. List three products obtained in the chlor – alkali process. Which of these products is used 
for the manufacture of bleaching powder? 
 
5. An element ‘X’ forms an oxide. This oxides reacts with HCI as well as NaOH to form salt 
and water. Name the kind of this oxide and give one example. Write its chemical reaction 
either with HCI or NaOH. 
 
6. (i) Write the balanced chemical equation for the process of photosynthesis. 
 (ii) When do the desert plants takeup carbon dioxide and perform photosynthesis? 
 
7. (a) What are the bases which are soluble in water called? 
 (b) Write any four uses of bases. 
 
 
 
 
 
8. Name the substance oxidized and the substance reduced, and also identify the oxidizing 
agent and reducing agents in the following reactions: 
 (a) 
2 2 3
3MnO +4AI 3Mn+2AI O ? 
 (b) 
2 3 2
Fe O +3CO 2Fe+3CO ? 
 (c) 
4 2 2
So +2H S 3S+2H O ? 
 
9. Give reasons for the following: 
 (a) Prior to reducing of metal sulphides and metal carbonate must be converted into 
metal oxides. 
 (b) For extracting some metals displacement reactions are used in place of carbon to 
obtain metals form their oxides. 
 
10. (a) Mention of the name of one metal in each of the following: 
 (i) a metal foil which is used for packing of some of the medicine tablets. 
 (ii) a metal which is used for galvanizing iron. 
 (iii) a metal which is used almost exclusively for making filament of electric bulb. 
 (b) Which metal is more reactive cooper or iron? How can you prove it? 
 
11. State how concentration of auxin stimulates the cells to grow longer on the side of the 
shoot which away from light? 
 
12. Define breathing. Explain the mechanism of breathing in human beings. 
 
13. (a) Write two points of difference between enzymes and hormones. 
 (b) Name one endocrine gland in our body which performs dual function. Write the 
functions. 
 
14. An electric iron has a rating of 750W; 200V. Calculate: 
 (i) the current required. 
 (ii) the resistance of its heating element. 
 (iii) energy consumed by the iron in 2 hours. 
 
15. “ the magnetic field produced at its centre by a coil of n turns is n times as large as 
produced by a single turn”. Give reasons to justify this statement. 
 
16. One of the major caused of fire in office building is short circuiting. List three reasons 
which may lead to short circuiting. How can it be prevented? 
 
17. Aarti lives in a society flat where she has noticed that most of the people living in the 
society go to their work place in their own cars. Aarti has read about the pollution caused 
by burning of fossil fuels used in vehicles. She wants to conduct an awareness programme 
in her society regarding the minimum use of personal cars. 
 (i) Suggest any two ways by which Aarti can create awareness amongst the adults of her 
society. 
Page 3


 
 
 
 
GYAN SAGAR PUBIC SCHOOL 
SUMMATIVE ASSESSMENT – I, 2016 – 17 
SCIENE 
Class: X 
Time: 3Hrs.           M.M: 90 
 
General instructions:  
1. The question paper comprises of two Section A and B. You are to attempt both the 
section. 
2. All questions are compulsory 
3. All questions of Section A and all questions of Section B are to be attempted separately. 
4. Question numbers 1 to 3 in Section A are one mark questions. These are to be answered 
in on word or in one sentence. 
5. Question numbers 4 to 6 in Section A are three marks questions. These are to be 
answered in about 30 words each. 
6. Question numbers 7 to 18 in Section A are three marks questions. These are to be 
answered in about 50 words each. 
7. Question numbers 19 to 24 in Section A are five marks questions. These are to be 
answered in about 70 words each. 
8. Question numbers 25 to 33 in section B are multiple choice questions based on practical 
skills. Each question is a one mark question. You are select one most appropriate 
response out of the four provided to you. 
9. Question numbers 34 to 36 in Section B are questions based on practical skills. Each 
question is of two marks. 
 
SECTION A 
1. In case of a spinal cord injury, identify the signals that will get disrupted. 
 
2. Define the SI unit of Resistance. 
 
3. Write any two applications of biogas. 
 
4. List three products obtained in the chlor – alkali process. Which of these products is used 
for the manufacture of bleaching powder? 
 
5. An element ‘X’ forms an oxide. This oxides reacts with HCI as well as NaOH to form salt 
and water. Name the kind of this oxide and give one example. Write its chemical reaction 
either with HCI or NaOH. 
 
6. (i) Write the balanced chemical equation for the process of photosynthesis. 
 (ii) When do the desert plants takeup carbon dioxide and perform photosynthesis? 
 
7. (a) What are the bases which are soluble in water called? 
 (b) Write any four uses of bases. 
 
 
 
 
 
8. Name the substance oxidized and the substance reduced, and also identify the oxidizing 
agent and reducing agents in the following reactions: 
 (a) 
2 2 3
3MnO +4AI 3Mn+2AI O ? 
 (b) 
2 3 2
Fe O +3CO 2Fe+3CO ? 
 (c) 
4 2 2
So +2H S 3S+2H O ? 
 
9. Give reasons for the following: 
 (a) Prior to reducing of metal sulphides and metal carbonate must be converted into 
metal oxides. 
 (b) For extracting some metals displacement reactions are used in place of carbon to 
obtain metals form their oxides. 
 
10. (a) Mention of the name of one metal in each of the following: 
 (i) a metal foil which is used for packing of some of the medicine tablets. 
 (ii) a metal which is used for galvanizing iron. 
 (iii) a metal which is used almost exclusively for making filament of electric bulb. 
 (b) Which metal is more reactive cooper or iron? How can you prove it? 
 
11. State how concentration of auxin stimulates the cells to grow longer on the side of the 
shoot which away from light? 
 
12. Define breathing. Explain the mechanism of breathing in human beings. 
 
13. (a) Write two points of difference between enzymes and hormones. 
 (b) Name one endocrine gland in our body which performs dual function. Write the 
functions. 
 
14. An electric iron has a rating of 750W; 200V. Calculate: 
 (i) the current required. 
 (ii) the resistance of its heating element. 
 (iii) energy consumed by the iron in 2 hours. 
 
15. “ the magnetic field produced at its centre by a coil of n turns is n times as large as 
produced by a single turn”. Give reasons to justify this statement. 
 
16. One of the major caused of fire in office building is short circuiting. List three reasons 
which may lead to short circuiting. How can it be prevented? 
 
17. Aarti lives in a society flat where she has noticed that most of the people living in the 
society go to their work place in their own cars. Aarti has read about the pollution caused 
by burning of fossil fuels used in vehicles. She wants to conduct an awareness programme 
in her society regarding the minimum use of personal cars. 
 (i) Suggest any two ways by which Aarti can create awareness amongst the adults of her 
society. 
 
 
 
 
 (ii) the adults of the society were suggested to start car pooling for going to their work 
place. How will this control the pollution? 
 (iii) Write any two qualities of Aarti portrayed in her action. 
 
18. Explain how is geothermal energy harnessed to produce electricity? 
 
19. (a) Define corrosion. 
 (b) What is corrosion of iron called? 
 (c) How will you recognize the corrosion of silver? 
 (d) Why carrion of iron is a serious problem? 
 (e) How can we prevent corrosion of iron? 
 
20. (a) The pH values of six solution A, B, C, D, E and F are 0, 11, 6, 7, 13 and 8 respectively. 
 Which of these solutions is 
  (i) weak acid  
  (ii) Weak base 
  (iii) Strong acid 
  (iv) Strong base 
  (v) Neutral 
 Arrange the solutions A, B, C, D, E and F in decreasing order of hydrogen ion 
concentration. 
 
 (b) Two solutions X and Y are tested with universal indicator. 
 Solution X turns orange whereas solution Y turns red. Which of these solutions is a 
stronger acid? 
 
 (c) The pH of a cold drink is 5. What will be its action on blue and red litmus solutions? 
 
21. (A) In the given schematic representation of transport and exchange of oxygen and 
carbon dioxide in human heart label the parts marked as a, b, c, d, e and f. 
  
 (B) Write two points of difference between pulmonary artery and pulmonary vein. 
 
22. Draw a labelled circuit diagram showing three resistors R1, R2 and R3 connected in series 
with a battery (E), a rheostat (Rh), a plug key (K) and an ammeter (A) sing standard 
circuit symbols. Use this circuit to show that the same current flows through every part of 
the circuit List two precautions you would observe while performing the experiment. 
Page 4


 
 
 
 
GYAN SAGAR PUBIC SCHOOL 
SUMMATIVE ASSESSMENT – I, 2016 – 17 
SCIENE 
Class: X 
Time: 3Hrs.           M.M: 90 
 
General instructions:  
1. The question paper comprises of two Section A and B. You are to attempt both the 
section. 
2. All questions are compulsory 
3. All questions of Section A and all questions of Section B are to be attempted separately. 
4. Question numbers 1 to 3 in Section A are one mark questions. These are to be answered 
in on word or in one sentence. 
5. Question numbers 4 to 6 in Section A are three marks questions. These are to be 
answered in about 30 words each. 
6. Question numbers 7 to 18 in Section A are three marks questions. These are to be 
answered in about 50 words each. 
7. Question numbers 19 to 24 in Section A are five marks questions. These are to be 
answered in about 70 words each. 
8. Question numbers 25 to 33 in section B are multiple choice questions based on practical 
skills. Each question is a one mark question. You are select one most appropriate 
response out of the four provided to you. 
9. Question numbers 34 to 36 in Section B are questions based on practical skills. Each 
question is of two marks. 
 
SECTION A 
1. In case of a spinal cord injury, identify the signals that will get disrupted. 
 
2. Define the SI unit of Resistance. 
 
3. Write any two applications of biogas. 
 
4. List three products obtained in the chlor – alkali process. Which of these products is used 
for the manufacture of bleaching powder? 
 
5. An element ‘X’ forms an oxide. This oxides reacts with HCI as well as NaOH to form salt 
and water. Name the kind of this oxide and give one example. Write its chemical reaction 
either with HCI or NaOH. 
 
6. (i) Write the balanced chemical equation for the process of photosynthesis. 
 (ii) When do the desert plants takeup carbon dioxide and perform photosynthesis? 
 
7. (a) What are the bases which are soluble in water called? 
 (b) Write any four uses of bases. 
 
 
 
 
 
8. Name the substance oxidized and the substance reduced, and also identify the oxidizing 
agent and reducing agents in the following reactions: 
 (a) 
2 2 3
3MnO +4AI 3Mn+2AI O ? 
 (b) 
2 3 2
Fe O +3CO 2Fe+3CO ? 
 (c) 
4 2 2
So +2H S 3S+2H O ? 
 
9. Give reasons for the following: 
 (a) Prior to reducing of metal sulphides and metal carbonate must be converted into 
metal oxides. 
 (b) For extracting some metals displacement reactions are used in place of carbon to 
obtain metals form their oxides. 
 
10. (a) Mention of the name of one metal in each of the following: 
 (i) a metal foil which is used for packing of some of the medicine tablets. 
 (ii) a metal which is used for galvanizing iron. 
 (iii) a metal which is used almost exclusively for making filament of electric bulb. 
 (b) Which metal is more reactive cooper or iron? How can you prove it? 
 
11. State how concentration of auxin stimulates the cells to grow longer on the side of the 
shoot which away from light? 
 
12. Define breathing. Explain the mechanism of breathing in human beings. 
 
13. (a) Write two points of difference between enzymes and hormones. 
 (b) Name one endocrine gland in our body which performs dual function. Write the 
functions. 
 
14. An electric iron has a rating of 750W; 200V. Calculate: 
 (i) the current required. 
 (ii) the resistance of its heating element. 
 (iii) energy consumed by the iron in 2 hours. 
 
15. “ the magnetic field produced at its centre by a coil of n turns is n times as large as 
produced by a single turn”. Give reasons to justify this statement. 
 
16. One of the major caused of fire in office building is short circuiting. List three reasons 
which may lead to short circuiting. How can it be prevented? 
 
17. Aarti lives in a society flat where she has noticed that most of the people living in the 
society go to their work place in their own cars. Aarti has read about the pollution caused 
by burning of fossil fuels used in vehicles. She wants to conduct an awareness programme 
in her society regarding the minimum use of personal cars. 
 (i) Suggest any two ways by which Aarti can create awareness amongst the adults of her 
society. 
 
 
 
 
 (ii) the adults of the society were suggested to start car pooling for going to their work 
place. How will this control the pollution? 
 (iii) Write any two qualities of Aarti portrayed in her action. 
 
18. Explain how is geothermal energy harnessed to produce electricity? 
 
19. (a) Define corrosion. 
 (b) What is corrosion of iron called? 
 (c) How will you recognize the corrosion of silver? 
 (d) Why carrion of iron is a serious problem? 
 (e) How can we prevent corrosion of iron? 
 
20. (a) The pH values of six solution A, B, C, D, E and F are 0, 11, 6, 7, 13 and 8 respectively. 
 Which of these solutions is 
  (i) weak acid  
  (ii) Weak base 
  (iii) Strong acid 
  (iv) Strong base 
  (v) Neutral 
 Arrange the solutions A, B, C, D, E and F in decreasing order of hydrogen ion 
concentration. 
 
 (b) Two solutions X and Y are tested with universal indicator. 
 Solution X turns orange whereas solution Y turns red. Which of these solutions is a 
stronger acid? 
 
 (c) The pH of a cold drink is 5. What will be its action on blue and red litmus solutions? 
 
21. (A) In the given schematic representation of transport and exchange of oxygen and 
carbon dioxide in human heart label the parts marked as a, b, c, d, e and f. 
  
 (B) Write two points of difference between pulmonary artery and pulmonary vein. 
 
22. Draw a labelled circuit diagram showing three resistors R1, R2 and R3 connected in series 
with a battery (E), a rheostat (Rh), a plug key (K) and an ammeter (A) sing standard 
circuit symbols. Use this circuit to show that the same current flows through every part of 
the circuit List two precautions you would observe while performing the experiment. 
 
 
 
 
23. (a) What is a magnetic field? How is the direction of magnetic field at a place determined? 
 (b) State the rule for the direction of magnetic field produced around a current carrying 
straight conductor. Draw the pattern of this field. 
 
24. (a) The heating element of an electric heater glows while the cord does not glow. Give 
reason. 
 (b) Which uses more energy a 200 watt Television set in 40 minutes or 1000 watt toaster 
in 20 minutes? 
 
SECTION B 
25. A Drop of lemon juice when poured on pH paper the observation is: 
 (a) pH paper becomes yellow-orange 
 (b) pH paper becomes red 
 (c) pH paper becomes green 
 (d) pH paper becomes blue 
 
26. A student was given a solution of find its pH. His teacher declared his reduced his 
recorded pH as wrong. Student explained to his teacher, all the steps done by him while 
finding pH of sample. Mark the step taken by student in which he committed mistake. 
 (a) collection of apparatus 
 (b) cleaning of all apparatus 
 (c) making pH paper wet and then dip it in sample. 
 (d) recording observation. 
 
27. When dil HCI is added to Na2CO3 the gas liberated is: 
 (a) hydrogen  
 (b) carbon dioxide 
 (c) carbon monoxide 
 (d) chlorine 
 
28. In which of the following solution metallic ion can be displayed by aluminium? 
 (a) CuSO4 
 (b) NaCI 
 (c) CaCI2 
 (d) MgSO4 
 
29. Which one is not observed when aluminium strip is added to FeSO4 solution? 
 (a) The solution is light blue is staring 
 (b) Final solution becomes colourless 
 (c) A substance gets deposited on surface of aluminium strip 
 (d) The colour of the deposited substance is blackish green 
 
30. The normal positions of the pointers of two ammeters A1 and A2 and two voltmeters V1 
and V2 available in the laboratory are shown in the given figure. For an experiment to 
Page 5


 
 
 
 
GYAN SAGAR PUBIC SCHOOL 
SUMMATIVE ASSESSMENT – I, 2016 – 17 
SCIENE 
Class: X 
Time: 3Hrs.           M.M: 90 
 
General instructions:  
1. The question paper comprises of two Section A and B. You are to attempt both the 
section. 
2. All questions are compulsory 
3. All questions of Section A and all questions of Section B are to be attempted separately. 
4. Question numbers 1 to 3 in Section A are one mark questions. These are to be answered 
in on word or in one sentence. 
5. Question numbers 4 to 6 in Section A are three marks questions. These are to be 
answered in about 30 words each. 
6. Question numbers 7 to 18 in Section A are three marks questions. These are to be 
answered in about 50 words each. 
7. Question numbers 19 to 24 in Section A are five marks questions. These are to be 
answered in about 70 words each. 
8. Question numbers 25 to 33 in section B are multiple choice questions based on practical 
skills. Each question is a one mark question. You are select one most appropriate 
response out of the four provided to you. 
9. Question numbers 34 to 36 in Section B are questions based on practical skills. Each 
question is of two marks. 
 
SECTION A 
1. In case of a spinal cord injury, identify the signals that will get disrupted. 
 
2. Define the SI unit of Resistance. 
 
3. Write any two applications of biogas. 
 
4. List three products obtained in the chlor – alkali process. Which of these products is used 
for the manufacture of bleaching powder? 
 
5. An element ‘X’ forms an oxide. This oxides reacts with HCI as well as NaOH to form salt 
and water. Name the kind of this oxide and give one example. Write its chemical reaction 
either with HCI or NaOH. 
 
6. (i) Write the balanced chemical equation for the process of photosynthesis. 
 (ii) When do the desert plants takeup carbon dioxide and perform photosynthesis? 
 
7. (a) What are the bases which are soluble in water called? 
 (b) Write any four uses of bases. 
 
 
 
 
 
8. Name the substance oxidized and the substance reduced, and also identify the oxidizing 
agent and reducing agents in the following reactions: 
 (a) 
2 2 3
3MnO +4AI 3Mn+2AI O ? 
 (b) 
2 3 2
Fe O +3CO 2Fe+3CO ? 
 (c) 
4 2 2
So +2H S 3S+2H O ? 
 
9. Give reasons for the following: 
 (a) Prior to reducing of metal sulphides and metal carbonate must be converted into 
metal oxides. 
 (b) For extracting some metals displacement reactions are used in place of carbon to 
obtain metals form their oxides. 
 
10. (a) Mention of the name of one metal in each of the following: 
 (i) a metal foil which is used for packing of some of the medicine tablets. 
 (ii) a metal which is used for galvanizing iron. 
 (iii) a metal which is used almost exclusively for making filament of electric bulb. 
 (b) Which metal is more reactive cooper or iron? How can you prove it? 
 
11. State how concentration of auxin stimulates the cells to grow longer on the side of the 
shoot which away from light? 
 
12. Define breathing. Explain the mechanism of breathing in human beings. 
 
13. (a) Write two points of difference between enzymes and hormones. 
 (b) Name one endocrine gland in our body which performs dual function. Write the 
functions. 
 
14. An electric iron has a rating of 750W; 200V. Calculate: 
 (i) the current required. 
 (ii) the resistance of its heating element. 
 (iii) energy consumed by the iron in 2 hours. 
 
15. “ the magnetic field produced at its centre by a coil of n turns is n times as large as 
produced by a single turn”. Give reasons to justify this statement. 
 
16. One of the major caused of fire in office building is short circuiting. List three reasons 
which may lead to short circuiting. How can it be prevented? 
 
17. Aarti lives in a society flat where she has noticed that most of the people living in the 
society go to their work place in their own cars. Aarti has read about the pollution caused 
by burning of fossil fuels used in vehicles. She wants to conduct an awareness programme 
in her society regarding the minimum use of personal cars. 
 (i) Suggest any two ways by which Aarti can create awareness amongst the adults of her 
society. 
 
 
 
 
 (ii) the adults of the society were suggested to start car pooling for going to their work 
place. How will this control the pollution? 
 (iii) Write any two qualities of Aarti portrayed in her action. 
 
18. Explain how is geothermal energy harnessed to produce electricity? 
 
19. (a) Define corrosion. 
 (b) What is corrosion of iron called? 
 (c) How will you recognize the corrosion of silver? 
 (d) Why carrion of iron is a serious problem? 
 (e) How can we prevent corrosion of iron? 
 
20. (a) The pH values of six solution A, B, C, D, E and F are 0, 11, 6, 7, 13 and 8 respectively. 
 Which of these solutions is 
  (i) weak acid  
  (ii) Weak base 
  (iii) Strong acid 
  (iv) Strong base 
  (v) Neutral 
 Arrange the solutions A, B, C, D, E and F in decreasing order of hydrogen ion 
concentration. 
 
 (b) Two solutions X and Y are tested with universal indicator. 
 Solution X turns orange whereas solution Y turns red. Which of these solutions is a 
stronger acid? 
 
 (c) The pH of a cold drink is 5. What will be its action on blue and red litmus solutions? 
 
21. (A) In the given schematic representation of transport and exchange of oxygen and 
carbon dioxide in human heart label the parts marked as a, b, c, d, e and f. 
  
 (B) Write two points of difference between pulmonary artery and pulmonary vein. 
 
22. Draw a labelled circuit diagram showing three resistors R1, R2 and R3 connected in series 
with a battery (E), a rheostat (Rh), a plug key (K) and an ammeter (A) sing standard 
circuit symbols. Use this circuit to show that the same current flows through every part of 
the circuit List two precautions you would observe while performing the experiment. 
 
 
 
 
23. (a) What is a magnetic field? How is the direction of magnetic field at a place determined? 
 (b) State the rule for the direction of magnetic field produced around a current carrying 
straight conductor. Draw the pattern of this field. 
 
24. (a) The heating element of an electric heater glows while the cord does not glow. Give 
reason. 
 (b) Which uses more energy a 200 watt Television set in 40 minutes or 1000 watt toaster 
in 20 minutes? 
 
SECTION B 
25. A Drop of lemon juice when poured on pH paper the observation is: 
 (a) pH paper becomes yellow-orange 
 (b) pH paper becomes red 
 (c) pH paper becomes green 
 (d) pH paper becomes blue 
 
26. A student was given a solution of find its pH. His teacher declared his reduced his 
recorded pH as wrong. Student explained to his teacher, all the steps done by him while 
finding pH of sample. Mark the step taken by student in which he committed mistake. 
 (a) collection of apparatus 
 (b) cleaning of all apparatus 
 (c) making pH paper wet and then dip it in sample. 
 (d) recording observation. 
 
27. When dil HCI is added to Na2CO3 the gas liberated is: 
 (a) hydrogen  
 (b) carbon dioxide 
 (c) carbon monoxide 
 (d) chlorine 
 
28. In which of the following solution metallic ion can be displayed by aluminium? 
 (a) CuSO4 
 (b) NaCI 
 (c) CaCI2 
 (d) MgSO4 
 
29. Which one is not observed when aluminium strip is added to FeSO4 solution? 
 (a) The solution is light blue is staring 
 (b) Final solution becomes colourless 
 (c) A substance gets deposited on surface of aluminium strip 
 (d) The colour of the deposited substance is blackish green 
 
30. The normal positions of the pointers of two ammeters A1 and A2 and two voltmeters V1 
and V2 available in the laboratory are shown in the given figure. For an experiment to 
 
 
 
 
determine the equivalent resistance of two resistors connected in series the best choice 
of ammeter and voltmeter would be: 
   
 (a) Ammeter A1 and Voltmeter V1 
 (b) Ammeter A2 and Voltmeter V1 
 (c) Ammeter A1 and Voltmeter V2 
 (d) Ammeter A2 and Voltmeter V2 
 
31. A student was performing experiment to find the equivalent resistance of a parallel 
combination of two resitors with the help of a battery of 6V as per the circuit given below. 
He should choose a voltmeter to measure potential difference a across the combination of 
range. 
   
 (a) 0 – 2 V  
 (b) 0 – 6 V  
 (c) 0 – 3 V 
 (d) 0 – 1 V 
 
32. Given alongside is a sketch of a leaf partially covered with black paper and which is to be 
used in the experiment to show that light is necessary for the process of photosynthesis. 
At the end of the experiment, which one of the leaf parts labelled I, II and III will turn blue 
– black when dipped on iodine solution? 
  
 (a) I only 
 (b) II only 
 (c) I and II only 
 (d) II and III only