Two samples A and B of a gas initially at the same pressure and temperature are compressed from volume V to V 2 ( A isothermally and B adiabatically). The final pressure of A is

Less than the final pressure of B

Greater than the final pressure of B

Equal to the final pressure of B

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A gas is expanded from volume $V_{0}$ to $2 V_{0}$ under three different processes. Process $I$ is isobaric process, process $II$ is isothermal and process $III$ is adiabatic. Let $Δ U_{1}, Δ U_{2}$ and $Δ U_{3}$ be the change in the internal energy of the gas is these three processes respectively. Then

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Important Questions on Thermodynamics

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 2

Four curves $A, B, C$ and $D$ are drawn in the figure for a given amount of gas. The curves which represent adiabatic and isothermal process are,

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 3

The ideal gas of mass

m

in a state

A

goes to another state

B

via three different processes as shown in the figure. If

Q_{1}, Q_{2}

and

Q_{3}

denote the heat absorbed by the gas along the three paths, then

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 4

The $p - V$ diagram of a system undergoing thermodynamic transformation is as shown in figure. The work done on the system in going from $A \to B \to C$ is $50 J$ and $20$ cal heat is given to the system. The change in internal energy between $A$ and $C$ is

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 5

R =

universal gas constant, the amount of heat needed to raise the temperature of

2 mol

of an ideal monatomic gas from

273 K

373 K

, when no work is done is

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 6

A thermally insulated container is divided into two parts by a screen. In one part, the pressure and temperature are

P

and

T

for an ideal gas filled. In the second part, it is vacuum. If now a small hole is created in the screen, then the temperature of the gas will _____.

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 7

Two samples

A

and

B

of a gas initially at the same pressure and temperature are compressed from volume

V

\frac{V}{2}

(

A

isothermally and

B

adiabatically). The final pressure of

A

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 8

Three processes compose a thermodynamic cycle shown in the accompanying

P - V,

diagram of an ideal gas.
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Process

1 \to 2

takes place at constant temperature, during this process

60 J

of heat enters the system.
Process

2 \to 3

takes place at constant volume. During this process

40 J

of heat leaves the system.
Process

3 \to 1

is adiabatic.
What is the change in internal energy of the system during process

3 \to 1

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 9

$P ‐ V$ diagram of an ideal gas is as shown in the figure. Work done by the gas in a process $A B C D$ is

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A gas is expanded from volume V0 to 2V0 under three different processes. Process I is isobaric process, process II is isothermal and process III is adiabatic. Let ΔU1,ΔU2 and ΔU3 be the change in the internal energy of the gas is these three processes respectively. Then

Important Questions on Thermodynamics

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