set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

A spherical body moves with a uniform angular velocity (w) around a circular path of radius r. Which one of the following statements is correct?

a) The body has a radial acceleration 2/5$ω^2$r directed away from the centre of the path

b) The body has a radial acceleration $ω^2$r directed toward centre of path

c) The body has no acceleration

d) The body has an acceleration $ω^2$ tangential to its path

Question : 2

In which of the following examples, work done is negative?

a) Work done by the force of gravity on a freely falling object

b) Work done by the force of gravity on a ball thrown upwards

c) Work done by the force of gravity on a moving aeroplane

d) Work done by the force of gravity on a satellite revolving around the earth

Question : 3

Statement A :
While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper.
Statement B :
Friction always opposes motion.

a) Both statements are correct.

b) Statement B is correct.

c) Statement A is correct.

d) Both statements are incorrect.

Question : 4

The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph:

a)

b)

c)

d)

Question : 5

A vector quantity is a physical quantity which needs

a) magnitude

b) direction

c) both (a) and (b)

d) time

Question : 6

A jet engine works on the principle of conservation of

a) energy

b) angular momentum

c) linear momentum

d) mass