THERMODYNAMICS RT

If heat is supplied to an ideal gas in an isothermal process

• The gas will do negative work

• A)     The internal energy of the gas will remain same

• The said process is not possible

• None of these

A system X is neither in thermal equilibrium with Y nor with Z. The system Y and Z

• Must be in thermal equilibrium

• Can not be in thermal equilibrium

• May be in thermal equilibrium

• None of these

Theoretically the efficiency of a Carnot engine is 100% when the temperature of the sink is

• 0^oF

• 0^oC

• )   0^oK

• 0^oR

The formula connecting the pressure and volume of a gas undergoing an adiabatic change is

• P^γ V = constant

• PV = constant

• P V^γ-1  = constant

• PV^γ  = constant

In which process the P – V indicator diagram is a straight line parallel to volume axis?

• Isobaric

• Isothermal

• Adiabatic

• Irreversible

It is difficult to cook at high altitudes because

• There is less Oxygen in the air

• Due to fall is temperature, more heat has to be given

• Due to decrease in atmospheric pressure, the boiling point of water decrease

• Of high moisture content there.

• 5/7

• 4/35

• 7/5

• 35/4

The efficiency of diesel engine roughly ranges from:

• 25% to 35%

• 35% to 40%

• 45% to 65%

• 65% to 85%