2025 Exam Questions
Q “If two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other.” This statement refers to:
(A) zeroth law of thermodynamics
(B) first law of thermodynamics
(C) second law of thermodynamics
(D) Carnot’s law
Q. What do you mean by a thermodynamic system?
Q. A gas of 0.5 mole at 300 K expands isothermally from an initial volume of 2.0 litre to a final volume of 6.0 litre. What is the work done by gas?
Q. In a thermodynamic system, define –
(a) Mechanical equilibrium
(b) Chemical equilibrium and
(c) Thermal equilibrium
2024 Exam Questions
Q. In a cyclic process, if ∆U = intemal energy, W work done, Q = Heat supplied then
(a) \triangle U=Q
(b) Q = O
(c) W = O
(d) W = Q
Q. What is surroundings in thermodynamics?
Q. Explain the change in internal energy of a thermodynamic system (the gas) by heating it.
Q. What is an isothermal process? Obtain an expression for work done by a gas in an isothermal process.
Q. Prove the Mayer’s relation: C_p-C_v=\frac RJ
2023 Exam Questions
Q. The first law of thermodynamics is consistent with the law of conservation of _____.
(A) momentum
(B) energy
(c) mass
(D) velocity
Q. Derive an expression for the work done during an isothermal process.
Q. 104 J of work is done on certain volume of a gas. If the gas releases 125 kJ of heat, calculate the chage in internal energy of the gas.
Q. An ideal mono-atomic gas is adiabatically compressed so that its final temperature is twice its initial temperature. Calculate the ratio of final pressure to its initial pressure.
2022 Exam Questions
Q. The first law of thermodynamics is concerned with the conservation of ____.
(A) Momentum
(B) energy
(C) temperature
(D) mass
Q. A graph of pressure versus volume for an ideal gas for different processes is as shown. In the graph curve OA represents____.
(A) isochoric process
(B) isothermal process
(C) isobaric process
(d) adiabatic process
Q.State zeroth law of thermodynamics. What are the limitations of first law of thermodynamics?
Q. What are mechanical equilibrium and thermal equilibrium?
Q. What is thermodynamic process? Give any two types of it.
Q. In which thermodynamic process the total internal energy of system remains constant?
Q. The initial pressure and volume of a gas enclosed in a cylinder are 2 x 105 N.m2 and 6 x 10-3m3 respectively. If the work done in compressing the gas at constant pressure is 150 J, find the final volume of the gas.
Q. A system releases 125 kJ of heat while 104 kJ of work is done on the system. Calculate the change in internal energy of the gas.
