Class 9 Work and Energy Quiz set 2

1. One kilowatt is approximately equal to

 
 
 
 

2. 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?

 
 
 
 

3. A steam engines coverts

 
 
 
 

4. A raised hammer possesses

 
 
 
 

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

 
 
 
 

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

 
 
 
 

7. kWh represents the unit for

 
 
 
 

8. Watt sec represents the units for

 
 
 
 

9. 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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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