A wall has two layers A and B each made of a different material. Both layers have the same thickness, the thermal conductivity of the material of A is twice that of B. Under thermal equilibrium, the temperature difference across the wall is 36^oC. The temperature difference across the layer A will be:

During constant temperature, we feel colder on the day when the relative humidity is

In which of the following processes, convection does not take place primarily ?

Water of volume 2 litres in a container is heated with a coil of 1 KW at 27^oC. The lid of the container is open and energy dissipates at a rate of 160 Js^-1. In how much time, temperature will rise from 27^oC to 77^oC?  (Given that the specific heat of water is 4.2 kJ kg^-1)

A block of ice at - 10^oC is slowly heated and converted to steam at 100^oC. Which of the following curves represents the phenomenon qualitatively ?

A thermometer has wrong calibration.  It reads the melting point of ice as - 10^o C, the temperature of boiling point of water on this scale is :

A composite rod made of copper  and steel  is heated. Then

Compared to burn due to air at 100^oC, a burn due to steam at 100^oC is :

The unit of Stefan's constant is :

Two identical rods are connected between two containers. One of them is at 100^oC and another is at 0^oC. If rods are connected in parallel then the rate of melting of ice is q₁ g/sec. If they are connected in series then the rate is q₂. The ratio q₂/q₁ is: