Physics
The centre of gravity of a sprinter during the race lies

To the left side of the body
Behind his feet
At the centre of the body
Ahead of his feet

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Physics
Indicate the false statement about the resistance of a 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
It is directly proportional to the length of wire

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Both silver and gold pieces weigh equal
Weighing will depend on their masses
The silver piece will weigh more
The gold piece will weigh more

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