One mole of an ideal gas is taken through an adiabatic process where the temperature rises from 27 ° C to 37 ° C . If the ideal gas is composed of polyatomic molecule that has 4 vibrational modes, which of the following is true? R = 8 . 314 J mol - 1 k - 1

work done on the gas is close to 582 J

work done by the gas is close to 332 J

work done by the gas is close to 582 J

work done on the gas is close to 332 J

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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A heat engine has an efficiency of $\frac{1}{6}$ . When the temperature of sink is reduced by $62 ° C$ , its efficiency get doubled. The temperature of the source is :

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Important Questions on Thermodynamics

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 27 July 2021 Shift 1>Q 16

In the reported figure, there is a cyclic process $A B C D A$ on a sample of $1$ mol of a diatomic gas. The temperature of the gas during the process $A \to B$ and $C \to D$ are $T_{1}$ and $T_{2} (T_{1} > T_{2})$ respectively.

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Choose the correct option out of the following for work done if processes $B C$ and $D A$ are adiabatic.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 27 July 2021 Shift 2>Q 17

One mole of an ideal gas is taken through an adiabatic process where the temperature rises from

27 ° C

37 ° C

. If the ideal gas is composed of polyatomic molecule that has 4 vibrational modes, which of the following is true?

[R = 8.314 J {mol}^{- 1} k^{- 1}]

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JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main - 27 July 2021 Shift 2>Q 18

Two Carnot engines

A

and

B

operate in series such that engine A absorbs heat at

T_{1}

and rejects heat to a sink at temperature

T

. Engine

B

absorbs half of the heat rejected by Engine

A

and rejects heat to the sink at

T_{3}

. When workdone in both the cases is equal, to value of

T

is :

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main 16 March 2021 Shift 1>Q 19

In thermodynamics, heat and work are :

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main 16 March 2021 Shift 2>Q 20

For an ideal heat engine, the temperature of the source is

127 ° C

. In order to have

60 %

efficiency the temperature of the sink should be __________

{}^{\circ}C

. (Round off to the nearest integer)

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JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main 17 March 2021 Shift 1>Q 21

A Carnot's engine working between

400 K

and

800 K

has a work output of

1200 J

per cycle. The amount of heat energy supplied to the engine from the source in each cycle is:

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JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main 17 March 2021 Shift 2>Q 22

Which one is the correct option for the two different thermodynamic processes ?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Thermodynamics>JEE Main 18 March 2021 Shift 1>Q 23

The $P - V$ diagram of a diatomic ideal gas system going under cyclic process as shown in figure. The work done during an adiabatic process $C D$ is (use $γ = 1.4)$ :

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A heat engine has an efficiency of 16. When the temperature of sink is reduced by 62°C, its efficiency get doubled. The temperature of the source is :

Important Questions on Thermodynamics

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A heat engine has an efficiency of $\frac{1}{6}$ . When the temperature of sink is reduced by $62 ° C$ , its efficiency get doubled. The temperature of the source is :