Question No : 8
The transfer of heat by molecular collision is smallest in
Question No : 9
Thermal diffusivity is a
Question No : 10
The radiation emitted by a black body is known as
Question No : 11
Unit of thermal conductivity in M.K.S. units is
Question No : 12
Which of the following property of air does not increase with rise in temperature?
Question No : 13
The amount of radiation mainly depends upon the
Question No : 14
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of