mechanics (mass, force, acceleration, work, energy, momentum, velocity) - Category wise Question and Answer Practice Test with Solutions

Question : 16

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 : 17

A couple is acting on a two particle systems. The resultant motion will be

a) both a and b

b) purely linear motion

c) purely rotational motion

d) neither of a and b

Question : 18 [IAS Prelim]

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 : 19

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 : 20

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.