Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going up with an acceleration
The lift is going down with uniform speed
The lift is going up with uniform speed
The lift is going down with an acceleration

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be in the form of a vertical rod
Should be made of a good conductor like copper with sharp-pointed edges
Can be of any shape
Should be made of a good conductor but can be of any shape

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The rubber ball suffers greater change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball
The metal ball suffers greater change in momentum
Both suffer the same change in momentum

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