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

Question : 21

Kepler’s second law (law of area) is nothing but a statement of

a) conservation of angular momentum

b) conservation of linear momentum

c) work energy theorem

d) conservation of energy

Question : 22 [UPPCS (Mains) 2004]

The working principle of a washing machine is

a) Reverse osmosis

b) Dialysis

c) Centrifugation

d) Diffusion

Question : 23

Rahul takes 1 minute to raise a box to a height of 1 metre and Rohan takes 1/2 minute to do so. Comment on the energy by the two.

a) Energy spent by the Rohan is more

b) Energy spent by both Rahul and Rohan is same.

c) Energy spent by the Rahul is more.

d) Cannot be said

Question : 24

A man getting down a running bus, falls forward because

a) he leans forward as a matter of habit

b) due to inertia of motion upper part of body continues to be in motion in forward direction while feet come to rest as soon as they touch the road

c) due to inertia of rest, road is left behind and man reaches forward

d) of the combined effect of all the three factors stated in (a), (b) and (c)

Question : 25

When a steady torque is acting on a body, the body

a) gets angular acceleration

b) gets linear acceleration

c) continues in its state of rest or uniform motion along a straight line

d) rotates at a constant speed