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1. Two objects of masses m and 2m are dropped from the same height. The ratio of their kinetic energies just before hitting the ground is

A. 2:1 B. 1:2 C. 1:1 D. 1:4

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2. Work done by a force is given as 50 J. If the displacement is 5 m and the force acts along the displacement, find the magnitude of the force

A. 20 N B. 50 N C. 10 N D. 5 N

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3. A body of mass 3 kg has a velocity of 4 m/s. The kinetic energy of the body is

A. 48 J B. 6 J C. 12 J D. 24 J

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4. Which of the following is an example of potential energy

A. A moving car B. An electric current C. Water stored in a dam D. A spinning top

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5. A block of 1 kg is subjected to a force that increases its speed from 2 m/s to 6 m/s. Calculate the work done on the block

A. 24 J B. 40 J C. 16 J D. 32 J

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6. A block of 5 kg is sliding down an inclined plane making an angle of 30° with the horizontal. What is the work done by gravity when the block moves 2 m along the plane

A. 100 J B. 49 J C. 50 J D. 10 J

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7. A force of 50 N displaces an object by 3 m in the direction of the force. The work done is

A. 50 J B. 200 J C. 150 J D. 100 J

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8. A car accelerates uniformly from rest. The work done by the engine in covering a distance of 100 m is proportional to

A. Distance squared B. Square root of velocity C. Velocity squared D. Velocity

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9. A body of mass 5 kg moves under a constant force of 10 N. If the displacement is 5 m, the work done is

A. 100 J B. 25 J C. 50 J D. 75 J

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10. If the power of an engine is doubled, the work done in a given time will

A. Become four times B. Remain constant C. Halve D. Double

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11. If the angle between force and displacement is 180 degrees, the work done is

A. Positive B. Negative C. Cannot be determined D. Zero

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12. A force of 20 N displaces a body by 2 m at an angle of 60° to the force. The work done by the force is

A. 20√3 J B. 10 J C. 20 J D. 40 J

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13. A block of 5 kg is sliding down an inclined plane making an angle of 30° with the horizontal. What is the work done by gravity when the block moves 2 m along the plane

A. 10 J B. 50 J C. 49 J D. 100 J

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14. A spring of spring constant 200 N/m is compressed by 0.1 m. The potential energy stored in the spring is

A. 1 J B. 0.05 J C. 2 J D. 0.5 J

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15. The work-energy theorem states

A. Work done by the net force is equal to the change in kinetic energy B. Work done is equal to the change in potential energy C. Work is equal to energy D. Work done is equal to power multiplied by time

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16. Which of the following is an example of potential energy

A. A spinning top B. Water stored in a dam C. An electric current D. A moving car

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17. An object moves in a circle of radius 2 m with constant speed. The work done by centripetal force in one complete revolution is

A. 20 J B. 0 J C. 10 J D. 40 J

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18. A body of mass 2 kg is lifted to a height of 5 m. The work done on the body against gravity is

A. 10 J B. 200 J C. 100 J D. 50 J

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19. The potential energy of a body of mass 5 kg at a height of 10 m is

A. 500 J B. 1000 J C. 50 J D. 100 J

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20. A car of mass 1000 kg is moving at a speed of 20 m/s. The work required to bring the car to rest is

A. 400 kJ B. 300 kJ C. 200 kJ D. 100 kJ