Class 9 Work and Energy Quiz set 2

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

 
 
 
 

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

 

 
 
 
 

3. 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

 
 
 
 

4. 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?

 
 
 
 

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

 
 
 
 

6. A steam engines coverts

 
 
 
 

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

 
 
 
 

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 a body is whirled in a circle, the work

 
 
 
 

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

 
 
 
 

11. Watt sec represents the units for

 
 
 
 

12. A raised hammer possesses

 
 
 
 

13. One kilowatt is approximately equal to

 
 
 
 

14. kWh represents the unit for

 
 
 
 

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

 
 
 
 

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