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JEE 2020 Physics: Thermodynamics Quiz - 3 (11.07.2019)

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Question 1

The relation

: Molar specific heats at constant pressure, volume) is exactly true for

Question 2

Let us say, we are using Carnot’s engine as a refrigerator with a source at 117⁰C and sinks at 77⁰C. Then what can you say about the operating temperature of the refrigerant used for cooling?

Question 3

For which combination of working temperatures, the efficiency of ‘Carnot’s engine’ is the least?

Question 4

An ideal monatomic gas expands to twice its volume. If the process is isothermal, the magnitude of work done by the gas is

. If the process is adiabatic, the magnitude of work done by the gas is

. Which of the following is true?

Question 5

A thermodynamic cycle takes in heat energy at a high temperature and rejects energy at a lower temperature. If the amount of energy rejected at the low temperature is 3 times the amount of work done by the cycle, the efficiency of the cycle is

Question 6

Monoatomic, diatomic and triatomic gases whose initial volume and pressure are same, are compressed till their volume becomes half the initial volume.

Question 7

The figure, shows the graph of logarithmic reading of pressure and volume for two ideal gases A and B undergoing adiabatic process. From figure it can be concluded that

Question 8

An ideal gas at pressure P and volume V is expanded to volume 2V. Column I represents the thermodynamic processes used during expansion. Column II represents the work during these processes in the random order.

The correct matching of column I and column II is given by :

Question 9

An ideal gas is taken from point A to point C on P–V diagram through two process AOC and ABC as shown in the figure. Process AOC is isothermal

Question 10

Pressure versus temperature graph of an ideal gas is shown in figure.

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