Work Energy and Power 2

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Quiz

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1.A light body and a heavy body have equal kinetic energy which has greater momentum?

2 points

The light body

Both have equal momentum

The heavy body

Data given is incomplete

Clear selection

2. Work done by a body against friction force always result in a loss of :

1 point

kinetic energy

potential energy

both of them

none of them

Clear selection

3.A machine has an efficiency of 50%. If input of machine is 1.5 kW, then its output is:

1 point

1500 W

750 W

250 W

1000 W

Clear selection

5.When a body is projected vertically up. At some point P at height h its kinetic energy is twice of potential energy at that point. At what height its potential energy is twice that of kinetic energy?

2 points

h/3

h/4

Clear selection

6.Out of a pair of identical Spring Constant 240 Newton per metre, one is compressed by 10 cm and the other is stretched by 20 cm . The difference in potential energy stored in the two spring is:

2 points

0 J

1.2 J

3.6 J

6.0 J

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7.A block of mass 1 kg slides down a inclined plane of inclination 60° starting from its top. If coefficient of kinetic friction is 0.5 and length of the plane is 1 m, then work done against friction is (g=9.8m/s^2):

2 points

19.6 J

4.9 J

2.45 J

9.8 J

Clear selection

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