A refrigerator works between It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is:
(Take 1 cal = 4.2 Joules)

What is the difference in temperature of water at the top and bottom of a rainfall of height 500 mts.

(Sp. Heat of water = $$10^3$$​ cal/kg & J = 4.2 J/cal)

The temperature of the reservoir of a Carnot engine, operating with an efficiency of 70% is 1000K. The temperature of its sink is:

The zeroth law of thermodynamics introduces the concept of:

The second law of thermodynamics introduces the concept of:

In an experiment on the specific heat of a metal, a 0.30 kg block of the metal at 120°Cis dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 100 $$\text{cm}^3$$​ ofwater at 27°C. The final temperature is 35°C. Calculate the specific heat of the metal?

A thermacole cubical icebox of side 20 cm has a thickness of 4.0 cm. If 5.0 kg of ice is put in the box, estimate the amount of ice remaining after 5h. The outside temperature is 35°C, and coefficient of thermal conductivity of thermacole is 0.01 J $$\text s^{-1}\space\text m^{-1}\space\text k^{-1}$$​. (Heat of fusion of water = 335 × $$10^3$$​ J $$\text {kg}^{-1}$$​)