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 circle
A horizontal straight line
A vertical straight line
A parabola

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Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust does not stick to the ice.

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