set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements :

1. Copernicus discovered that the earth moves around the sun.
2. An astronaut cannot use a straw to sip a drink on the surface of the moon.
3. The S.I. unit of weight is kilogram.

a) 2 and 3

b) 1 and 2

c) 1 and 3

d) 1, 2 and 3

Question : 2

In wind power, which form of energy is converted into electrical energy?

a) Solar energy

b) Potential energy

c) Kinetic energy

d) Radiant energy

Question : 3

A book is kept on the surface of a table. If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by

a) the table on the book

b) the book on the earth

c) the book on the table

d) the table on the earth

Question : 4

Assertion (A):
A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R):
If no external force acts on a system, its momentum cannot change.
Code

a) (A) is true, but (R) is false

b) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 5

For a given mass and size, moment of inertia of a solid disc is

a) equal to that of a ring

b) less than that of a ring

c) more than that of a ring

d) depend on the material of ring and disc