Which one of the following forms of water has the highest value of thermal conductivity?

Identify the very good insulator

Most metals are good conductor of heat because of

The heat energy propagation due to conduction heat transfer will be minimum for

The temperature distribution in a large thin plate with uniform surface temperature will be
(Assume steady-state condition)

The interior of an oven is maintained at a temperature of 850 degree Celsius by means of a suitable control apparatus. The oven walls are 500 mm thick and are fabricated from a material of thermal conductivity 0.3 W/m degree. For an outside wall temperature of 250 degree Celsius, workout the resistance to heat flow

 Three metal walls of the same thickness and cross-sectional area have thermal conductivities k, 2k, and 3k respectively. The temperature drop across the walls (for same heat transfer) will be in the ratio

Heat is transferred from a hot fluid to a cold one through a plane wall of a thickness (δ), surface area (A), and thermal conductivity (k). The thermal resistance is

For an object i.e. spherical the value of critical radius would be

The value of critical radius in the case of a cylindrical hollow object is