Physics
The centre of gravity of a sprinter during the race lies

Ahead of his feet
At the centre of the body
To the left side of the body
Behind his feet

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Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and start coming down
Reach a particular height and remain floating
Burst after reaching some height

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Physics
The law of conservation of energy states that

Energy can either be created nor destroyed
Energy can either be created or destroyed
Energy can neither be created or destroyed
Energy can neither be created nor destroyed

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