Thermodynamics

In adiabatic process of closed system, work done by the gas depends explicity on

The equilibrium state of a thermodynamic system is described by :
A. Pressure
B. Total heat
C. Temperature
D. Volume
E. Work done

Choose the most appropriate answer from the options given below:

The equilibrium state of a thermodynamic system is described by :
A. Pressure
B. Total heat
C. Temperature
D. Volume
E. Work done

Choose the most appropriate answer from the options given below:

[Re-NEET 2024]

For an ideal monoatomic gas undergoing an isobaric process, what is the ratio \(\frac{\Delta Q}{\Delta U}\)? (Shift I - Memory Based)

An ideal gas at 0°C is suddenly compressed to 1/4 times of its initial volume. If the ratio of molar heat capacity at constant pressure to the molar heat capacity at constant volume is 3/2 find the difference between final temperature and initial temperature.

(Shift I Memory Based)

The temperature of a body of mass \(m\) and specific heat capacity \(s\)s is raised slowly from \({T}_{1}\) to \({T}_{2}\)​. The change in entropy of the system is:(Shift - II Memory Based)

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In an insulated container, a gas is adiabatically shrunk to half of its initial volume. The temperature of the gas decreases.
Reason (R): Free expansion of an ideal gas is an irreversible and an adiabatic process.
In the light of the above statements, choose the correct answer from the options given below :

Water of mass \(m\) gram is slowly heated to increase the temperature from \({T}_{1}\) to \({T}_{2}\). The change in entropy of the water, given specific heat of water is \(1{\mathrm{Jkg}}^{-1}{\mathrm{K}}^{-1}\), is :

[JEE Main 2025, 23 Jan (Shift 2)]

A Carnot engine (E) is working between two temperatures 473 K and 273 K . In a new system two engines - engine \({E}_{1}\) works between 473 K to 373 K and engine \({E}_{2}\) works between 373 K to 273 K . If \({\eta }_{12}\), \({\eta }_{1}\) and \({\eta }_{2}\) are the efficiencies of the engines \(E\), \({E}_{1}\) and \({E}_{2}\), respectively, then

[JEE Main 2025, 28 Jan (Shift 1)]

In a process, the pressure of a gas is directly proportional to its temperature. Choose the correct options:

A: The process is isochoric.
B: Work done in the process is zero.
C: Internal energy increases with an increase in temperature.

(Shift I - Memory Based)

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio \(C_p / C_v\) for the gas is:

[JEE Main 2024, 27 Jan (Shift 2)]

Given are statements for certain thermodynamic variables,
(A) Internal energy, volume \((\mathrm{V})\) and mass \((\mathrm{M})\) are extensive variables.
(B) Pressure (P), temperature (T) and density ( \(\rho\) ) are intensive variables.
(C) Volume (V), temperature (T) and density ( \(\rho\) ) are intensive variables.
(D) Mass (M), temperature (T) and internal energy are extensive variables.

Choose the correct answer from the options given below :

[JEE Main 2025, 22 Jan (Shift 2)]

Assertion: On increasing the pressure, the volume decrease is more in an isothermal process than in an adiabatic process.

Reason: The adiabatic process is governed by the equation:\(P{V}^{\gamma }=\text{constant}\)

(Shift - II Memory Based)

For an ideal monoatomic gas undergoing an isobaric process, what is the ratio \(\frac{\Delta Q}{\Delta U}\)? (Shift I - Memory Based)

The workdone in an adiabatic change in an ideal gas depends upon only :

[JEE Main 2025, 29 Jan (Shift 1)]

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : With the increase in the pressure of an ideal gas, the volume falls off more rapidly in an isothermal process in comparison to the adiabatic process.
Reason (R) : In isothermal process, PV = constant, while in adiabatic process \(P{V}^{\gamma }=\) constant. Here \(\gamma\) is the ratio of specific heats, P is the pressure and V is the volume of the ideal gas.
In the light of the above statements, choose the correct answer from the options given below :

An ideal gas goes from an initial state to final state. During the process, the pressure of gas increases linearly with temperature.
A. The work done by gas during the process is zero.
B. The heat added to gas is different from change in its internal energy
C. The volume of the gas is increased.
D. The internal energy of the gas is increased.
E. The process is isochoric (constant volume process)
Choose the correct answer from the options given below:

[JEE Main 2025, 24 Jan (Shift 1)]

Water of mass \(m\) gram is slowly heated to increase the temperature from \({T}_{1}\) to \({T}_{2}\). The change in entropy of the water, given specific heat of water is \(1{\mathrm{Jkg}}^{-1}{\mathrm{K}}^{-1}\), is :

[JEE Main 2025, 23 Jan (Shift 2)]

Assertion: On increasing the pressure, the volume decrease is more in an isothermal process than in an adiabatic process.

Reason: The adiabatic process is governed by the equation:\(P{V}^{\gamma }=\text{constant}\)

(Shift - II Memory Based)

The efficiency of a carnot engine depends upon

A diatomic gas (\(\gamma\) = 1.4) does 100 J of work in an isobaric expansion. The heat given to the gas is :