Thermodynamics is an important topic in the Chemistry section in MHT CET exam. Practising this topic will increase your score overall and make your conceptual grip on MHT CET exam stronger.
This article gives you a full set of MHT CET PYQs for Thermodynamics with explanations for effective preparation. Practice of MHT CET Chemistry PYQs including Thermodynamics questions regularly will improve accuracy, speed, and confidence in the MHT CET 2026 exam.
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MHT CET PYQs for Thermodynamics with Solutions
1.
In which thermodynamic process, there is no exchange of heat between the system and surroundings?
- Isothermal
- Adiabatic
- Isochoric
- Isobaric
2.
Identify the equation in which change in enthalpy is equal to change in internal energy- $2H_{2}O_{2} (I) \to 2H_{2}O(I) +O_{2}(g)$
- $C(s) +O_{2}(g) \to CO_{2}(g)$
- $PCl_{5}(g) \to PCl_{3}(g) +Cl_{2}(g)$
- $N_{2}(g) + 3\,H_{2}(g) \to 2NH_{3}(g)$
3.
When you heat a sample of gas, what happens to the particles that make up the gas?- (A) The particles move faster
- (B) The particles break apart
- (C) The particles get smaller
- (D) The particles become more dense
4.
A gas expands from a volume of 2 m\(^3\) to a volume of 5 m\(^3\) at a constant pressure of \( 2 \times 10^5 \, \text{Pa} \). Calculate the work done by the gas.- \( 6 \times 10^5 \, \text{J} \)
- \( 6 \times 10^4 \, \text{J} \)
- \( 2 \times 10^6 \, \text{J} \)
- \( 1 \times 10^5 \, \text{J} \)
5.
In an adiabatic expansion of a gas initial and final temperatures are T1 and T2 respectively then the change in internal energy of the gas is [R = gas constant, γ = adiabatic ratio]
R (T1 - T2)
\(\frac {R(T_1-T_2)}{γ-1}\)
\(\frac {R(T_2-T_1)}{γ-1}\)
- zero
6.
A gas is compressed from an initial volume of 10 L to 5 L. The pressure during the compression is constant at 2 atm. Calculate the work done on the gas.20 L·atm
10 L·atm
- 5 L·atm
- 15 L·atm
7.
A gas absorbs \( 100 \, \text{J} \) of heat while performing \( 40 \, \text{J} \) of work on its surroundings. Calculate the change in internal energy of the gas.- \( 60 \, \text{J} \)
- \( 140 \, \text{J} \)
- \( 40 \, \text{J} \)
- \( 100 \, \text{J} \)
8.
Which among the following equations represents the first law of thermodynamics under isobaric conditions ?- $\ce{\Delta U = q_p - P_{ex} . \Delta V }$
- ${q_v = \Delta U }$
- $\ce{\Delta U = W }$
- $W =-q$
9.
Which is an adiabatic process?- The free expansion of a gas into a vacuum.
- The reversible isothermal expansion of an ideal gas.
- The slow compression of a gas in a cylinder fitted with a frictionless piston
- The rapid compression of a gas in a cylinder fitted with a frictionless piston.
10.
Under isothermal conditions a gas expands from 0.2 dm3 to 0.8 dm3 against a constant pressure of 2 bar at 300 K. Find the work done by the gas.(1 dm3 bar = 100 J)
- 160 J
- –120 J
- –40 J
- 20 J
11.
In adiabatic compression, which of the following is true?- Temperature increases
- Temperature decreases
- Pressure remains constant
- Amount of heat exchanged with surround
12.
The enthalpy of vaporization of water is 40.79 kJ/mol. How much heat is required to vaporize 2 moles of water at its boiling point?- 40.79 kJ
- 81.58 kJ
- 20.39 kJ
- 10.39 kJ
13.
A cylinder of fixed capacity \( 67.2 \, \mathrm{L} \) contains helium gas at STP. The amount of heat needed to raise the temperature of the gas in the cylinder by \( 20^\circ \mathrm{C} \) is:- \( 700.5 \, \mathrm{J} \)
- \( 747.9 \, \mathrm{J} \)
- \( 760.2 \, \mathrm{J} \)
- \( 800.0 \, \mathrm{J} \)
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