Class 9 Work and Energy Quiz set 1

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


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


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


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


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


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


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


9. Work done upon a body is


10. The number of joules contained in 1 kWh is


11. A stretched string possesses _______ energy.


12. 1 hp is equal to


13. 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


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


15. 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


Question 1 of 15


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