Question

SECTION - A
1. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of
copper sulphate is obtained and the sulphuric acid so formed remains in the solution. The reaction is an
example of :-
(a)A combination reaction
(b) A displacement reaction
(CJA decomposition reaction
(d) A double displacement reaction
2. What happens when copper rod is dipped in iron sulphate solution :-
(a)Copper displaces iron
(b)Blue color of copper sulphate solution is obtained
(c)No reaction takes place
(d) Reaction is exothermic
3. Sodium carbonate is a basic salt because it is a salt of
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base
4. Which of the following gives the correct increasing order of acidicstrength?
(a) Water <Acetic acid <Hydrochloric acid
(b) Water <Hydrochloric acid <Acetic acid
(c) Acetic acid <Water <Hydrochloric acid
(d) Hydrochloric acid <Water <Acetic acid
5. Electrical resistivity of a given metallic wire depends upon
(a) its length
(b) its thickness
(c) its shape (d) nature of the material
6. What is the maximum resistance which can be made using fiveresistors each of 1/5 0?
(a) 1/50
(b) 100
(c) 502 (d) 10
7. The inner lining of stomach is protected by one of the followingfrom hydrochloric acid. Choose the
correct one
a) Pepsin
(b) Mucus
(c) Salivary amylase (d) Bile
8. Sometimes we get painful cramps in our leg muscles after running for a long time due to the
accumulation of
(a)Fat
(b) Hydrochloric acid (c) Carbon dioxide (d) Lactic acid
9. A positive charge is moving towards a person. The direction of magnetic field lines will be in
(a) Clockwise direction
(b) Anticlockwise direction
(c) Vertically upward direction
(d) Vertically downward direction
10. An electric motor is a device which transforms
(a) Mechanical energy into electrical energy
(b) Electrical energy into mechanical energy
(c) Kinetic energy into potential energy​

Answer 1

Answer:

1. (B)

2. (a)

3.(b)

4.(c)

5.(c)

6. (d)

7. (a)

8.(B)

9.(d)

10.(c)

Explanation:

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