Thermodyanmics questions with solutions

Showing 1–10 of 149 questions

• MCQeasyThermodyanmicskinetic therory of gaseous

  The translational degrees of freedom (f(trans)) and rotational degrees of freedom (f(rot)) of CH₄ molecule are:

  Options

  • Option A

    f(trans) = 2 and f(rot) = 2

  • Option B

    f(trans) = 3 and f(rot) = 3

  • Option C

    f(trans) = 3 and f(rot) = 2

  • Option D

    f(trans) = 2 and f(rot) = 3

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  JEE Mains 2024 04 Apr Evening Shift

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• MCQmediumThermodyanmicsthermodynmic process and work done

  A thermodynamic system is taken through the cyclic process shown in the P–V graph. The total work done is:

  

  Options

  • Option A

    100 J

  • Option B

    300 J

  • Option C

    200 J

  • Option D

    Zero

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  15 April 2023 Morning Shift

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• MCQeasyThermodyanmicsthermodynmic process and work done

  Two moles of an ideal monoatomic gas at temperature T are mixed thermally with six moles of another ideal monoatomic gas at temperature 2T. Assuming no heat is exchanged with the surroundings and both gases have the same molar heat capacity at constant volume, what is the final equilibrium temperature of the mixture?

  Options

  • Option A

    5T/ 2

  • Option B

    5T/4

  • Option C

    7T/ 2

  • Option D

    7T/ 4

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  JEE Mains 2026 6 April Evening Shift

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• MCQmediumThermodyanmicsfirst law of thermodynamics

  The specific heat at constant pressure of a real gas obeying PV² = RT equation is :

  Options

  • Option A

    Cᵥ + R

  • Option B

    Cᵥ + R/3

  • Option C

    R

  • Option D

    Cᵥ + R/(2V)

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  JEE Mains 2024 06 Apr Morning Shift

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• MCQeasyThermodyanmicskinetic therory of gaseous

  The root mean square velocity of molecules of a gas is:

  Options

  • Option A

    Proportional to T²

  • Option B

    Inversely proportional to √T

  • Option C

    Proportional to √T

  • Option D

    Proportional to T

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  JEE Mains25 January 2023Morning Shift

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• Multi-correctmediumThermodyanmicsthermodynmic process and work done

  Ten moles of an ideal monoatomic gas, initially in state a at atmospheric pressure and temperature T(a) = 27°C, is enclosed in a metal cylinder of volume V₀ fitted with a frictionless piston. The gas is suddenly compressed to state b with volume V₀/3. Now, keeping the piston stationary, the cylinder is submerged in a water bath of temperature 11°C until the gas reaches the temperature of the water bath, which is denoted as state c. Finally, while still in the water bath, the piston is brought slowly to its initial position, which is denoted as state f. If R is universal gas constant, then the correct option(s) is/are: [Given: 9^(1/3) = 2.08]

  Select all that apply

  • Option A

    The schematic P-V diagram of the processes described above is as shown in figure.

    
  • Option B

    The change in internal energy in going from state a to b is 4860R.

  • Option C

    The net change in the internal energy in the whole process is -240R.

  • Option D

    The pressure and temperature of the state b are 2.08 times the atmospheric pressure and 624 K, respectively.

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  JEE Advanced2026Paper 2

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• MCQmediumThermodyanmicsheat transfer due to radiation

  Two spherical black bodies have radii 0.8 m and 0.2 m and temperatures 400 K and 800 K respectively. Find the ratio P₁/P₂ of their rates of heat loss.

  Options

  • Option A

    8

  • Option B

    4

  • Option C

    2

  • Option D

    1

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  JEE Main 2025 (Online) 22 jan morning Shift

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• Multi-correctmediumThermodyanmicsthermodynmic process and work done

  Choose the correct statement for processes A & B shown in figure.

  

  Select all that apply

  • Option A

    PVᵞ = k for process B and PV = k for process A.

  • Option B

    PV = k for process B and A.

  • Option C

    $P^(γ-1)/T^γ$ = k for process B and T = k for process A.

  • Option D

    $T^γ/P^(γ-1)$ = k for process A and PV = k for process B.

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  JEE Mains 2024 30 Jan Evening Shift

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• MCQmediumThermodyanmicsthermodynmic process and work done

  An ideal gas initially has pressure P₀ and volume V₀. It is suddenly compressed to volume V₀/4. If γ is the ratio of specific heats, the final pressure is:

  Options

  • Option A

    P₀·4¹ᐟᵞ

  • Option B

    4P₀

  • Option C

    P₀

  • Option D

    P₀·4ᵞ

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  13 April 2023 Evening Shift

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• MCQmediumThermodyanmicsheat and principle of calorimeter

  Ice at -10°C is converted completely into steam at 110°C. The mass of ice is 10⁻³ kg. Using the standard heat capacities and latent heats used in the question, the heat required is:

  Options

  • Option A

    730 cal

  • Option B

    900 cal

  • Option C

    1210 cal

  • Option D

    870 cal

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  JEE Main 2025 (Online) 22 jan morning Shift

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