set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

The energy of wind is

a) Electrical

b) Only kinetic

c) Only potential

d) Potential and kinetic both

Question : 2

Which physical quantity is represented by the ratio of momentum and velocity of the body?

a) Mass

b) Acceleration

c) Velocity

d) Force

Question : 3

A missile is launched with a velocity less than escape velocity. The sum of its kinetic and potential energies is

a) positive

b) negative

c) zero

d) may be positive, negative or zero

Question : 4

1 kilowatt hour is equal to

a) 36 joule

b) 100 joule

c) 1 joule

d) 3.6 × 10³ kilo joule

Question : 5

Consider the following two statements:

1. Linear momentum of a system of particles is zero.
2. Kinetic energy of a system of particles is zero.

a) 1 implies 2 and 2 implies 1.

b) 1 implies 2 but 2 does not imply 1.

c) 1 does not imply 2 but 2 implies 1.

d) 1 does not imply 2 and 2 does not imply 1.

Question : 6

As the train starts moving, the head of the passenger sitting inside leans backward because of

a) Moment of Inertia

b) Inertia of Motion

c) Inertia of Rest

d) Conservation of Mass