The molar specific heats of an ideal gas at constant pressure and volume are denoted by CP and CV respectively. If and R is then CV universal gas constant, then CV is equal to
γR
Conversion of water to steam is accompanied by which process?
Adiabatic
Isothermal
Isochoric
Cyclic
An ideal gas is taken through the cycle A → B → C → A, as shown in figure. If the net heat supplied to the gas in the cycle is 5 J the work done by the gas in the process A → B is
2 J
3 J
4 J
5 J
For an adiabatic process
ΔS = 0
Δu = 0
Q = 0
W = 0
A.
ΔS = 0
An adiabatic process is one in which no heat is gained or lost by the system. The first law of thermodynamics with Q = 0 shows that all the change in internal energy is the form of work done.
For an adiabatic process, change in entropy of the system is zero,
ΔS = 0
Assertion: During rapid pumping of air in tyres, air inside the tyre is hotter than atmospheric air.
Reason: Adiabatic process occurs at very high rate.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true but reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The latent heat of vaporisation of a substance is always
greater than its latent heat of fusion
greater than its latent heat of sublimation
equal to its latent heat of sublimation
less than its latent heat of fusion
A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62°C, the efficiency of the engine is doubled. The temperatures of the source and sink are
99oC, 37oC
80oC, 37oC
95oC, 37oC
90oC, 37oC