Physics
The energy stored in a watch spring is

Chemical energy
Kinetic energy
Potential energy
Heat energy

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Physics
The earth is a

Good reflector of heat
Good absorber and good radiator of heat
Non-absorber of heat
Bad absorber and bad radiator of heat

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

The question is incomplete because the masses of the spheres are not given.
A will reach the ground first.
Both the spheres will reach the ground simultaneously.
B will reach the ground first.

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