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

Question : 6 [IAS (Pre) 1996]

A truck, a car and a motorcycle have equal kinetic energies. If equal, stopping forces are applied and they stop after travelling a distance of X, Y and Z respectively, then

a) X = Y = Z

b) X < Y < Z

c) X > Y > Z

d) X ≅ 4Y ≅ 8Z

Question : 7

How much time will it take to perform 440 J of work at a rate of 11 W?

a) 30 s

b) 40 s

c) 50 s

d) 20 s

Question : 8

Regarding mechanical energy, which of the following statements is/are correct?

1. Kinetic energy of a body depends upon the direction of motion.
2. When a body falls freely, its P.E. is converted into K.E.
3. A body at rest may possess P.E.

a) 2 only

b) 1 and 2

c) 2 and 3

d) 3 only

Question : 9

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

Question : 10

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.