Physics
Ice is packed in saw dust because

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

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Physics
A Fuse wire is characterised by

Low resistance and low melting point
Low resistance and high melting point
High resistance and low melting point
High resistance and high melting point

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Physics
Circuit breaker usually operate under

Sub-transient state of short-circuit current
Steady state of short-circuit current
After D. C. component has ceased
Transient state of short-circuit current

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