Physics
The propagation of sound waves in a gas involves

Isothermal compression and rarefaction
Isobaric compression and rarefaction
Adiabatic compression and rarefaction
Isochoric compression and rarefaction

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Physics
Ice is packed in saw dust because

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

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised

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