Physics
Indicate the false statement about the resistance of a wire

It is directly proportional to the length of wire
Resistance of metallic wire increases with increase in temperature
It is directly proportional to the area of cross-section of wire
It depends on material of wire

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Physics
Ice is packed in saw dust because

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

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