Physics
A cyclist leans inwards when he is negotiating a curve so that

He may increase his speed
No frictional force may be produced between the wheels and the axle
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
His weight may be reduced

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Physics
Ice is packed in saw dust because

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

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short wave broadcasts are made by nearby radio stations.

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