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Important questions on Heat And Temperature

HARD

Two identical rods of a mental are welded in series then 20 cal of heat flows through them in  4 minute. If the rods are welded in parallel then same amount of heat will flow in 

A

1 minute

B

2 minute

C

4 minute

D

15 minute

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HARD

Liquid helium is stored at its boiling point in a spherical can, separated by a vacuum space from surrounding shield which is maintained at the temperature of liquid nitrogen If the can is in radius and is blacked on the outside so that it acts as a black body, how much helium boils away per hour?
(Latent heat of vaporization is  )

A

B

C

D

g/h

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