Class 9 Work and Energy Quiz set 2

1. 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

 
 
 
 

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

 
 
 
 

3. One kilowatt is approximately equal to

 
 
 
 

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

 

 
 
 
 

5. A steam engines coverts

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

9. 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?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

13. Watt sec represents the units for

 
 
 
 

14. kWh represents the unit for

 
 
 
 

15. A raised hammer possesses

 
 
 
 

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