Physics
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A parabola
A horizontal straight line
A vertical straight line
A circle

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth
Because streamlining is required

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