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PHYSICS

Physics
For a freely falling body, the sum of kinetic energy and potential energy is always

Unity
Same
Variable
Zero

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Physics
A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be ________

40 J
50 J
20 J
30 J

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Physics
If the velocity of a body is halved its kinetic energy ________

Become 4 times
Becomes half
Becomes 1/4 th
Is also doubled

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Physics
Solar energy is converted into chemical energy during

Osmosis
Photosynthesis
Diffusion
Transpiration

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Physics
In which of the following cases, kinetic energy is being used in performing work ?

Rowing a boat in the lake
Paddling the bicycle to cover a distance
Wind mill grinding wheat grain
Driving a car to cover a distance

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