Class 9 Work and Energy Quiz set 1

1. No work is said to have been done when an object moves’ at an angle of ……….. with the direction of the force.

 
 
 
 

2. Two unequal masses posses the momentum, then the kinetic energy of the heavier mass is ………… the kinetic energy of the lighter mass.

 
 
 
 

3. A body is thrown vertically up from the earh′s surface. What happened to its P.E. during the motion ?

 
 
 
 

4. A body of mass 20 kg is dropped from a height of 2m. If  ‘g’ is taken to be equal to 10 m/s², the Kinetic energy of the body, just before striking the ground, will be

 
 
 
 

5. Two unequal masses posses the same K.E.  Then, the heavier mass has

 
 
 
 

6. The mass of an objectis double the mass of Q. If both move with the same velocity, then the ratio of K.E. of P to that of Q is

 
 
 
 

7. A ball of mass 200 g fall form height of 5 m. what is its K.E. when it just reaches the ground ?

 
 
 
 

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

 
 
 
 

9. A stretched string possesses _______ energy.

 
 
 
 

10. The work done in lifting a mass of 1 kg to a height of 9.8 m is

 
 
 
 

11. The number of joules contained in 1 kWh is

 
 
 
 

12. The speed of a motor car becomes six times, then the kinetic energy becomes

 
 
 
 

13. The K.E. of a body in increased most,  by doubling its

 
 
 
 

14. Work done upon a body is

 
 
 
 

15. 1 hp is equal to

 
 
 
 

Question 1 of 15

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