# Class 9 Work and Energy Quiz set 1

1. The number of joules contained in 1 kWh is

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

3. A stretched string possesses _______ energy.

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

5. Work done upon a body is

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

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

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

9. 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

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

11. 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

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

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

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

15. 1 hp is equal to

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