set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

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 : 3

1 kilowatt hour is equal to

a) 36 joule

b) 100 joule

c) 1 joule

d) 3.6 × 10³ kilo joule

Question : 4

The sum of the change in kinetic and potential energy is always

a) Negative

b) Positive

c) Zero

d) None of the above

Question : 5

A monkey is climbing up a rope, then the tension in the rope

a) must be greater than the force applied by the monkey on the rope.

b) must be less than the force applied by the monkey on the rope.

c) must be equal to the force applied by the monkey on the rope.

d) may be equal to, less than or greater the force applied by the monkey on the rope.

Question : 6

The centre of mass of triangle shown in figure has coordinates

a) $x = b/3, y = h/3$

b) $x = b/2, y = h/2$

c) $x = h/2, y = b/2$

d) $x = h/3, y = b/3$