Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Efficiency of a reversible heat engine will be highest at – 273 ° C temperature of cold reservoir. Reason R : The efficiency of Carnot’s engine depends not only on temperature of cold reservoir but it depends on the temperature of hot reservoir too and is given as η = 1 - T 2 T 1 In the light of the above statements, choose the correct answer from the options given below :

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is NOT the correct explanation of A

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The pressure $P_{1}$ and density $d_{1}$ of diatomic gas $(γ = \frac{7}{5})$ changes suddenly to $P_{2} (> P_{1})$ and $d_{2}$ respectively during an adiabatic process. The temperature of the gas increases and becomes____times of its initial temperature.

(Given $\frac{d_{2}}{d_{1}} = 32$ )

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Important Questions on Thermodynamics

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 29 July 2022 Shift 1>Q 116

One mole of a monoatomic gas is mixed with three moles of a diatomic gas. The molecular specific heat of mixture at constant volume is

\frac{α^{2}}{4} R J mol K^{- 1}

; then the value of

α

will be _____ . (Assume that the given diatomic gas has no vibrational mode.)

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JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 29 July 2022 Shift 2>Q 117

A thermodynamic system is taken from an original state $D$ to an intermediate state $E$ by the linear process shown in the figure. Its volume is then reduced to the original volume from $E$ to $F$ by an isobaric process. The total work done by the gas from $D$ to $E$ to $F$ will be

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JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 24 January 2023 Shift 1>Q 118

1 g

of a liquid is converted to vapour at

3 \times 10^{5} Pa

pressure. If

10 %

of the heat supplied is used for increasing the volume by

1600 {cm}^{3}

during this phase change, then the increase in internal energy in the process will be :

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 24 January 2023 Shift 2>Q 119

Let

γ_{1}

be the ratio of molar specific heat at constant pressure and molar specific heat at constant volume of a monoatomic gas and

γ_{2}

be the similar ratio of diatomic gas. Considering the diatomic gas molecule as a rigid rotator, the ratio

\frac{γ_{1}}{γ_{2}}

is:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 24 January 2023 Shift 2>Q 120

In an Isothermal change, the change in pressure and volume of a gas can be represented for three different temperature;

T_{3} > T_{2} > T_{1}

as:

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JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 25 January 2023 Shift 1>Q 121

A Carnot engine with efficiency

50 %

takes heat from a source at

600 K

. In order to increase the efficiency to

70 %

, keeping the temperature of sink same, the new temperature of the source will be:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 25 January 2023 Shift 2>Q 122

According to law of equipartition of energy the molar specific heat of a diatomic gas at constant volume where the molecule has one additional vibrational mode is :-

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 25 January 2023 Shift 2>Q 123

Match List I with List II :

	List I		List II
A	Isothermal Process	I	Work done by the gas decreases internal energy
B	Adiabatic Process	II	No change in internal energy
C	Isochoric Process	III	The heat absorbed goes partly to increase internal energy and partly to do work
D	Isobaric Process	IV	No work is done on or by the gas

Choose the correct answer from the options given below :

The pressure P1 and density d1 of diatomic gas γ=75 changes suddenly to P2>P1 and d2 respectively during an adiabatic process. The temperature of the gas increases and becomes____times of its initial temperature. (Given d2 d1=32)

Important Questions on Thermodynamics

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The pressure $P_{1}$ and density $d_{1}$ of diatomic gas $(γ = \frac{7}{5})$ changes suddenly to $P_{2} (> P_{1})$ and $d_{2}$ respectively during an adiabatic process. The temperature of the gas increases and becomes____times of its initial temperature.

(Given $\frac{d_{2}}{d_{1}} = 32$ )