Class 9 Work and Energy Quiz set 2

1. The moon revolves around the around the earth because the earth exerts a radial force on the moon. Does the earth perform work on the moon?

2. A raised hammer possesses

3. One kilowatt is approximately equal to

4. A steam engines coverts

5. what is the momentum of a body of mass 100 g having K.E. of 20 J ?

6. what is the momentum of a body of mass 100 g having K.E. of 20 J ?

7. When a body is whirled in a circle, the work

8. Two bodies of equal weight are kept at height of h and 1.5h respectively. The ratio of their P.E. is

9. when the force applied and the displacement of the body are inclined at 90° with each other the work done is

10. When the momentum of a body increases by 10%, its K.E. increases by

11. When the speed of a moving object is doubled, its

12. When the momentum of a body increases by 100%, its K.E. increases by

13. Watt sec represents the units for

14. kWh represents the unit for

15. A body of mass m kg is lifted by a man to a height of one meter in 30 s. Another man lifts  the same mass to the same height in 60 s. The Work done by them is in the ratio