Modes of heat transfer

Explain briefly the process of heat transfer by radiation.

Name the method of heat transfer which does not depends on gravity ?

If there is no gravity i.e. acceleration due to gravity is zero then which method of heat transfer is not possible

Look at the picture of the thermos flask and answer the following question Which means of heat transfer are prevented by having a vacuum between the two walls of thermos flasks?

State the direction of heat transfer by way of convection.

Give one example of heat transfer by radiation.

For one mole of a diatomic gas, the ratio of heat transfer at constant pressure to work done by the gas is

The vacuum kept in between the walls of a thermos flask reduces the heat transfer by :

During an isobaric heating process the work done by oxygen gas is 4 J. Calculate the amount of heat transferred to the gas. [gamma = 1.4]

Two rods (one semi-circular and other straight) of same material and of same cross-sectional area are joined as shown in the figure. The point A and B are maintained at different temperature. Find the ratio of the heat transferred through a cross-section of a semi-circular rod to the heat transferred through a cross section of the straight rod in a given time.