Science Past Year Paper SA-1(Set -2) - 2014, Class 10, CBSE Class 10 Notes | EduRev

Past Year Papers For Class 10

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Class 10 : Science Past Year Paper SA-1(Set -2) - 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. State a difference between the wires used in the element of an electric heater and in fuse 
wire. 
2. Thermal power plants are set up near coal and oil fields. Give reasons. 
3. Mention any two measures that you would take to conserve electricity in your house. 
4. Identify the type of each of the following reactions. 
a) The reaction mixture becomes warm. 
b) An insoluble substances is formed. 
5. Define ionic compounds. Ionic compounds conduct electricity only in the molten state not in 
the solid state. Why? 
6. State the advantages of connecting electrical devices in parallel instead of connecting them in 
series with the battery. 
7. 2 gm of lead nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. 
Now answer the following 
a) State the colour of the fumes evolved and the residue left. 
b) Name the type of chemical reaction that has taken place stating its balanced chemical 
equation. 
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. State a difference between the wires used in the element of an electric heater and in fuse 
wire. 
2. Thermal power plants are set up near coal and oil fields. Give reasons. 
3. Mention any two measures that you would take to conserve electricity in your house. 
4. Identify the type of each of the following reactions. 
a) The reaction mixture becomes warm. 
b) An insoluble substances is formed. 
5. Define ionic compounds. Ionic compounds conduct electricity only in the molten state not in 
the solid state. Why? 
6. State the advantages of connecting electrical devices in parallel instead of connecting them in 
series with the battery. 
7. 2 gm of lead nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. 
Now answer the following 
a) State the colour of the fumes evolved and the residue left. 
b) Name the type of chemical reaction that has taken place stating its balanced chemical 
equation. 
 
 
 
 
8. When food containing fat or oil is not used left for a long time, their smell and taste changes. 
Name the process and state responsible for their change. List two methods to prevent or 
slow down the above change. 
9. a) You are given two solutions A and B. the PH of solution A is 6 and PH of solution B is 8. 
(i) identify the acidic and basic solution. 
(ii) Which solution has more H
+
 ion concentration? Give reasons for your answer. 
(iii) Why is HCl a stronger acid than acetic acid? Explain. 
10. A metal X is left in moist air for a longer time, loses its shiny brown surface and gain a green 
coat. Why has this happened? Name and give chemical formula of this green coloured 
compound and identify the metal. List two ways to prevent this process. 
11. Find 
a) The highest and 
b) The lowest value of resistance that can be secured by the combination of four resistors of 
4 ohms, 8 ohms, 12 ohms and 24 ohms. 
12. State reason for the following: 
a) Tungsten is used for making bulb filaments 
b) Copper and aluminium are generally used for electricity transmission 
c) Alloys are commonly used in electrical heating devices such as electric iron and toaster 
13. a) State the Right Hand Thumb rule to find the direction of the magnetic field around a 
current carrying straight conductor. 
b) How will the magnetic field be affected on? 
 (i) Increasing the current through the conductor? 
 (ii) Reversing the direction of flow of current in the conductor? 
14. What will happen if? 
a) Mucus is not secreted by the gastric gland 
b) Leaves of plants are covered with Vaseline 
c) Bile juice is not produced in liver 
15. a) Identify the endocrine glands A, B, C, D in the given diagram 
b) List the function of part E and F 
  
16. Define magnetic field. Draw the magnetic field lines due to a bar magnet. Mark on it the 
regions of strongest and weakest magnetic field. 
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. State a difference between the wires used in the element of an electric heater and in fuse 
wire. 
2. Thermal power plants are set up near coal and oil fields. Give reasons. 
3. Mention any two measures that you would take to conserve electricity in your house. 
4. Identify the type of each of the following reactions. 
a) The reaction mixture becomes warm. 
b) An insoluble substances is formed. 
5. Define ionic compounds. Ionic compounds conduct electricity only in the molten state not in 
the solid state. Why? 
6. State the advantages of connecting electrical devices in parallel instead of connecting them in 
series with the battery. 
7. 2 gm of lead nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. 
Now answer the following 
a) State the colour of the fumes evolved and the residue left. 
b) Name the type of chemical reaction that has taken place stating its balanced chemical 
equation. 
 
 
 
 
8. When food containing fat or oil is not used left for a long time, their smell and taste changes. 
Name the process and state responsible for their change. List two methods to prevent or 
slow down the above change. 
9. a) You are given two solutions A and B. the PH of solution A is 6 and PH of solution B is 8. 
(i) identify the acidic and basic solution. 
(ii) Which solution has more H
+
 ion concentration? Give reasons for your answer. 
(iii) Why is HCl a stronger acid than acetic acid? Explain. 
10. A metal X is left in moist air for a longer time, loses its shiny brown surface and gain a green 
coat. Why has this happened? Name and give chemical formula of this green coloured 
compound and identify the metal. List two ways to prevent this process. 
11. Find 
a) The highest and 
b) The lowest value of resistance that can be secured by the combination of four resistors of 
4 ohms, 8 ohms, 12 ohms and 24 ohms. 
12. State reason for the following: 
a) Tungsten is used for making bulb filaments 
b) Copper and aluminium are generally used for electricity transmission 
c) Alloys are commonly used in electrical heating devices such as electric iron and toaster 
13. a) State the Right Hand Thumb rule to find the direction of the magnetic field around a 
current carrying straight conductor. 
b) How will the magnetic field be affected on? 
 (i) Increasing the current through the conductor? 
 (ii) Reversing the direction of flow of current in the conductor? 
14. What will happen if? 
a) Mucus is not secreted by the gastric gland 
b) Leaves of plants are covered with Vaseline 
c) Bile juice is not produced in liver 
15. a) Identify the endocrine glands A, B, C, D in the given diagram 
b) List the function of part E and F 
  
16. Define magnetic field. Draw the magnetic field lines due to a bar magnet. Mark on it the 
regions of strongest and weakest magnetic field. 
 
 
 
 
17. Increasing demand of fossil fuels has caused harm to our environment. List its three ill 
effects. Suggest three measures to reduce the consumption of fossil fuels. 
18. There was Poster making competition in a school on a topic ‘SAVE ENERGY’. The students 
were also asked to give write ups on this topic. A student of the school is unable to make 
write up on ‘SAVE ENERGY’. 
a) Suggest him two steps to ‘SAVE ENERGY’. 
b) Mention the value which the school is trying to give its students by holding such a 
competition. 
19. a) State the chemical name and formula of bleaching powder. Write the chemical 
equation for its preparation. Also mention its two uses other than bleaching. 
b) Explain why aqueous solution of an acid conducts electricity. 
c) You four section A, B, C, D. The PH of solution A is 6, B is 9, C is 12, and D is 7. 
 (i) Identify the most acidic and most basic solution. 
 (ii) State the change in colour of PH paper on dipping in solution C and D. 
20. a) Which method will you use to reduce the following? Explain by giving a suitable 
example. 
(i) Oxides of less reactive metals. 
(ii) Oxides of moderately reactive metals. 
(iii) Oxides of highly reactive metals. 
b) The reaction between metal X and 
2 3
Fe O is highly exothermic and is used to join 
railway tracks. 
 (i) Identify metal X and name the reaction. 
 (ii) Write the chemical equation of reaction of X with 
2 3
Fe O 
21. a) State ohm’s law. How is it represented graphically? Apply this law to obtain the 
reaction for the combined resistance when three resistors R1, R2, R3 are connected in series. 
b) List two advantages of using fuse in domestic circuit. 
22. a) Draw a diagram of human excretory system label renal artery, ureter, urethra and 
kidney. 
b) What are peristaltic movements? 
c) Name one enzyme present in stomach and give its functions. 
23. State the rule to determine the direction of a: 
a) Force experienced by a current carrying straight conductor placed in magnetic field 
which is perpendicular to it and  
b) Current induced in a coil due to its rotation in a magnetic field. 
c) What is solenoid? Draw magnetic field lines due to a current carrying solenoid. 
24. a) Name the part of the brain which controls; 
(i) Voluntary action 
(ii) Involuntary action 
b) How is brain protected in our body? 
c) Explain the following: 
(i) Geotropism 
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. State a difference between the wires used in the element of an electric heater and in fuse 
wire. 
2. Thermal power plants are set up near coal and oil fields. Give reasons. 
3. Mention any two measures that you would take to conserve electricity in your house. 
4. Identify the type of each of the following reactions. 
a) The reaction mixture becomes warm. 
b) An insoluble substances is formed. 
5. Define ionic compounds. Ionic compounds conduct electricity only in the molten state not in 
the solid state. Why? 
6. State the advantages of connecting electrical devices in parallel instead of connecting them in 
series with the battery. 
7. 2 gm of lead nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. 
Now answer the following 
a) State the colour of the fumes evolved and the residue left. 
b) Name the type of chemical reaction that has taken place stating its balanced chemical 
equation. 
 
 
 
 
8. When food containing fat or oil is not used left for a long time, their smell and taste changes. 
Name the process and state responsible for their change. List two methods to prevent or 
slow down the above change. 
9. a) You are given two solutions A and B. the PH of solution A is 6 and PH of solution B is 8. 
(i) identify the acidic and basic solution. 
(ii) Which solution has more H
+
 ion concentration? Give reasons for your answer. 
(iii) Why is HCl a stronger acid than acetic acid? Explain. 
10. A metal X is left in moist air for a longer time, loses its shiny brown surface and gain a green 
coat. Why has this happened? Name and give chemical formula of this green coloured 
compound and identify the metal. List two ways to prevent this process. 
11. Find 
a) The highest and 
b) The lowest value of resistance that can be secured by the combination of four resistors of 
4 ohms, 8 ohms, 12 ohms and 24 ohms. 
12. State reason for the following: 
a) Tungsten is used for making bulb filaments 
b) Copper and aluminium are generally used for electricity transmission 
c) Alloys are commonly used in electrical heating devices such as electric iron and toaster 
13. a) State the Right Hand Thumb rule to find the direction of the magnetic field around a 
current carrying straight conductor. 
b) How will the magnetic field be affected on? 
 (i) Increasing the current through the conductor? 
 (ii) Reversing the direction of flow of current in the conductor? 
14. What will happen if? 
a) Mucus is not secreted by the gastric gland 
b) Leaves of plants are covered with Vaseline 
c) Bile juice is not produced in liver 
15. a) Identify the endocrine glands A, B, C, D in the given diagram 
b) List the function of part E and F 
  
16. Define magnetic field. Draw the magnetic field lines due to a bar magnet. Mark on it the 
regions of strongest and weakest magnetic field. 
 
 
 
 
17. Increasing demand of fossil fuels has caused harm to our environment. List its three ill 
effects. Suggest three measures to reduce the consumption of fossil fuels. 
18. There was Poster making competition in a school on a topic ‘SAVE ENERGY’. The students 
were also asked to give write ups on this topic. A student of the school is unable to make 
write up on ‘SAVE ENERGY’. 
a) Suggest him two steps to ‘SAVE ENERGY’. 
b) Mention the value which the school is trying to give its students by holding such a 
competition. 
19. a) State the chemical name and formula of bleaching powder. Write the chemical 
equation for its preparation. Also mention its two uses other than bleaching. 
b) Explain why aqueous solution of an acid conducts electricity. 
c) You four section A, B, C, D. The PH of solution A is 6, B is 9, C is 12, and D is 7. 
 (i) Identify the most acidic and most basic solution. 
 (ii) State the change in colour of PH paper on dipping in solution C and D. 
20. a) Which method will you use to reduce the following? Explain by giving a suitable 
example. 
(i) Oxides of less reactive metals. 
(ii) Oxides of moderately reactive metals. 
(iii) Oxides of highly reactive metals. 
b) The reaction between metal X and 
2 3
Fe O is highly exothermic and is used to join 
railway tracks. 
 (i) Identify metal X and name the reaction. 
 (ii) Write the chemical equation of reaction of X with 
2 3
Fe O 
21. a) State ohm’s law. How is it represented graphically? Apply this law to obtain the 
reaction for the combined resistance when three resistors R1, R2, R3 are connected in series. 
b) List two advantages of using fuse in domestic circuit. 
22. a) Draw a diagram of human excretory system label renal artery, ureter, urethra and 
kidney. 
b) What are peristaltic movements? 
c) Name one enzyme present in stomach and give its functions. 
23. State the rule to determine the direction of a: 
a) Force experienced by a current carrying straight conductor placed in magnetic field 
which is perpendicular to it and  
b) Current induced in a coil due to its rotation in a magnetic field. 
c) What is solenoid? Draw magnetic field lines due to a current carrying solenoid. 
24. a) Name the part of the brain which controls; 
(i) Voluntary action 
(ii) Involuntary action 
b) How is brain protected in our body? 
c) Explain the following: 
(i) Geotropism 
 
 
 
 
(ii) Hydrotropism 
 
Section – B 
25. Four test tubes containing solution of different colour marked I, II, III and IV are shown 
below. The test tubes containing copper Sulphate solution and ferrous Sulphate solution, 
could be the tubes. 
 
26. A student dips PH paper in solution x and y and observes that the PH paper turns blue and 
orange respectively in them. What are X and Y. 
27. A student set up electric circuit shown here for finding the equivalent resistance of two 
resistors in series. In this circuit what is wrongly connected. 
 
28. What this experiment demonstrates. 
 
29. Label the marked parts in the given figure: 
 
Label – 1 ___________________ 
Label – 2 ___________________ 
30. What happens when water added to quick lime? 
31. Zn metal in the laboratory for doing experiments is available in which form 
32. What reaction takes place when hydrochloric acid reacts with Zinc? 
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. State a difference between the wires used in the element of an electric heater and in fuse 
wire. 
2. Thermal power plants are set up near coal and oil fields. Give reasons. 
3. Mention any two measures that you would take to conserve electricity in your house. 
4. Identify the type of each of the following reactions. 
a) The reaction mixture becomes warm. 
b) An insoluble substances is formed. 
5. Define ionic compounds. Ionic compounds conduct electricity only in the molten state not in 
the solid state. Why? 
6. State the advantages of connecting electrical devices in parallel instead of connecting them in 
series with the battery. 
7. 2 gm of lead nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. 
Now answer the following 
a) State the colour of the fumes evolved and the residue left. 
b) Name the type of chemical reaction that has taken place stating its balanced chemical 
equation. 
 
 
 
 
8. When food containing fat or oil is not used left for a long time, their smell and taste changes. 
Name the process and state responsible for their change. List two methods to prevent or 
slow down the above change. 
9. a) You are given two solutions A and B. the PH of solution A is 6 and PH of solution B is 8. 
(i) identify the acidic and basic solution. 
(ii) Which solution has more H
+
 ion concentration? Give reasons for your answer. 
(iii) Why is HCl a stronger acid than acetic acid? Explain. 
10. A metal X is left in moist air for a longer time, loses its shiny brown surface and gain a green 
coat. Why has this happened? Name and give chemical formula of this green coloured 
compound and identify the metal. List two ways to prevent this process. 
11. Find 
a) The highest and 
b) The lowest value of resistance that can be secured by the combination of four resistors of 
4 ohms, 8 ohms, 12 ohms and 24 ohms. 
12. State reason for the following: 
a) Tungsten is used for making bulb filaments 
b) Copper and aluminium are generally used for electricity transmission 
c) Alloys are commonly used in electrical heating devices such as electric iron and toaster 
13. a) State the Right Hand Thumb rule to find the direction of the magnetic field around a 
current carrying straight conductor. 
b) How will the magnetic field be affected on? 
 (i) Increasing the current through the conductor? 
 (ii) Reversing the direction of flow of current in the conductor? 
14. What will happen if? 
a) Mucus is not secreted by the gastric gland 
b) Leaves of plants are covered with Vaseline 
c) Bile juice is not produced in liver 
15. a) Identify the endocrine glands A, B, C, D in the given diagram 
b) List the function of part E and F 
  
16. Define magnetic field. Draw the magnetic field lines due to a bar magnet. Mark on it the 
regions of strongest and weakest magnetic field. 
 
 
 
 
17. Increasing demand of fossil fuels has caused harm to our environment. List its three ill 
effects. Suggest three measures to reduce the consumption of fossil fuels. 
18. There was Poster making competition in a school on a topic ‘SAVE ENERGY’. The students 
were also asked to give write ups on this topic. A student of the school is unable to make 
write up on ‘SAVE ENERGY’. 
a) Suggest him two steps to ‘SAVE ENERGY’. 
b) Mention the value which the school is trying to give its students by holding such a 
competition. 
19. a) State the chemical name and formula of bleaching powder. Write the chemical 
equation for its preparation. Also mention its two uses other than bleaching. 
b) Explain why aqueous solution of an acid conducts electricity. 
c) You four section A, B, C, D. The PH of solution A is 6, B is 9, C is 12, and D is 7. 
 (i) Identify the most acidic and most basic solution. 
 (ii) State the change in colour of PH paper on dipping in solution C and D. 
20. a) Which method will you use to reduce the following? Explain by giving a suitable 
example. 
(i) Oxides of less reactive metals. 
(ii) Oxides of moderately reactive metals. 
(iii) Oxides of highly reactive metals. 
b) The reaction between metal X and 
2 3
Fe O is highly exothermic and is used to join 
railway tracks. 
 (i) Identify metal X and name the reaction. 
 (ii) Write the chemical equation of reaction of X with 
2 3
Fe O 
21. a) State ohm’s law. How is it represented graphically? Apply this law to obtain the 
reaction for the combined resistance when three resistors R1, R2, R3 are connected in series. 
b) List two advantages of using fuse in domestic circuit. 
22. a) Draw a diagram of human excretory system label renal artery, ureter, urethra and 
kidney. 
b) What are peristaltic movements? 
c) Name one enzyme present in stomach and give its functions. 
23. State the rule to determine the direction of a: 
a) Force experienced by a current carrying straight conductor placed in magnetic field 
which is perpendicular to it and  
b) Current induced in a coil due to its rotation in a magnetic field. 
c) What is solenoid? Draw magnetic field lines due to a current carrying solenoid. 
24. a) Name the part of the brain which controls; 
(i) Voluntary action 
(ii) Involuntary action 
b) How is brain protected in our body? 
c) Explain the following: 
(i) Geotropism 
 
 
 
 
(ii) Hydrotropism 
 
Section – B 
25. Four test tubes containing solution of different colour marked I, II, III and IV are shown 
below. The test tubes containing copper Sulphate solution and ferrous Sulphate solution, 
could be the tubes. 
 
26. A student dips PH paper in solution x and y and observes that the PH paper turns blue and 
orange respectively in them. What are X and Y. 
27. A student set up electric circuit shown here for finding the equivalent resistance of two 
resistors in series. In this circuit what is wrongly connected. 
 
28. What this experiment demonstrates. 
 
29. Label the marked parts in the given figure: 
 
Label – 1 ___________________ 
Label – 2 ___________________ 
30. What happens when water added to quick lime? 
31. Zn metal in the laboratory for doing experiments is available in which form 
32. What reaction takes place when hydrochloric acid reacts with Zinc? 
 
 
 
 
33. Which stain is used to stain leaf peel during experiments? 
34. Write the type of reaction and observation that can be made when: 
a) Barium chloride solution is added to sodium Sulphate solution 
b) Iron fillings are added to copper Sulphate solution 
35. If two resistors having resistance of 3 ohm and 6 ohm respectively are connected in parallel. 
What will be the net-resistance in the circuit? 
36. Why KOH solution is kept in the test tube inside the airtight conical flask? 
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