A Carnot engine having an efficiency of $\frac{1}{{10}}$ as heat engine, is used as a refrigerator. If the work done on the system is $10\;{\rm{ }}J,$ the amount of energy absorbed from the reservoir at lower temperature is

The radio of the slopes of $p - V$ graphs of adiabatic and isothermal is

In thermodynamic processes which of the following statements is not true

When $1g$ of water at ${0^ \circ }C$ and $1 imes {10^5}N/{m^2}$ pressure is converted into ice of volume $1.091c{m^3}$, the external work done will be

An air conditioner operates between $17^o$C and $37^o$C. It removes 800 calories of heat per second. What is the power consumed? (1 cal = 4.2 J)

During the adiabatic process of a gas is found to be proportional to the cube of its absolute temperature. The ratio ${C_p}/{C_v}$for the gas is

A certain mass of gas at $273K$ is expanded to 81 times its volume under adiabatic condition. If $\gamma = 1.25$ for the gas, then its final temperature is

Two soap bubbles of radii x and y coalesce to constitute a bubble of radius z. Then is equal to

A litre of dry air at STP allowed to expand to a volume of 3 L under adiabatic conditions. If${\rm{\gamma }} = 1.40$, the work done is $\left( {{3^{1.4}} = 4.6555} \right)$

A carnot engine takes $3 imes {10^6}\,\,cal$ of heat from a reservoir at ${627^0}C$ and gives it to a sink at ${27^0}C$. The work done by the engine is,

If the door of a refrigerator is kept open, then which of the following is true