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

 
 
 
 

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