Heat And Thermodynamics Mock Tests

An ideal gas undergoes an adiabatic compression such that its volume becomes half of the initial volume. If gamma = 1.4, the ratio of final pressure to initial pressure is:

A Carnot engine has an efficiency of 40% when the sink temperature is 300 K. The source temperature is:

A black body radiates energy at the rate of 40 W/m2 at temperature T1 and at 640 W/m2 at temperature T2. The ratio T1/T2 is:

An ideal gas undergoes an isothermal process from an initial state to a final state. The work done by the gas is 200 J. The change in internal energy of the gas is:

The SI unit of temperature is:

An ideal gas undergoes an isothermal expansion at temperature T. The work done by the gas is:

A gas is expanded adiabatically. During this process:

The heat required to raise the temperature of 100 g of copper (specific heat = 0.1 cal/g°C) from 20°C to 40°C is: