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Thermodynamics

First law of thermodynamics

Statement - 1 Two vessels A and B are connected to each other

Question

Medium

Solving time: 3 mins

Statement - 1
Two vessels A and B are connected to each other by a stopcock. Vessel A contains a gas at $0^{o} C$ and 1 atmosphere pressure and vessel B is evacuated. The two vessels are thermally insulated from the surroundings. If the stopcock is suddenly opened, there will be no change in the internal energy of the gas.
Statement - 2
No transfer of heat energy takes place between the system and the surroundings.

Statement - I is true, Statement - II is true; statement - II is a correct explanation for statement - I

Statement - I is true, statement - II is true; statement - II is NOT a correct explanation for statement - I

Statement - I is true, statement - II is false

Statement - I is false, statement - II is true

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Elizabeth Discussed

Statement - 1
Two vessels A and B are connected to each other by a stopcock. Vessel A contains a gas at

0^{o} C

and 1 atmosphere pressure and vessel B is evacuated. The two vessels are thermally insulated from the surroundings. If the stopcock is suddenly opened, there will be no change in the internal energy of the gas.
Statement - 2
No transfer of heat energy takes place between the system and the surroundings.

6 mins ago

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Text solutionVerified

Since the gas in vessel A expands freely, there will be no work done. Also, heat given to/from the system is zero hence from the first law of thermodynamics change in internal energy is zero.
The two vessels(as a system) are thermally insulated from the surroundings.
Statement - 2 is true.
Hence both statements are correct but the second statement is not the correct reason for the first

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Question Text	Statement - 1 Two vessels A and B are connected to each other by a stopcock. Vessel A contains a gas at $0^{o} C$ and 1 atmosphere pressure and vessel B is evacuated. The two vessels are thermally insulated from the surroundings. If the stopcock is suddenly opened, there will be no change in the internal energy of the gas. Statement - 2 No transfer of heat energy takes place between the system and the surroundings.
Topic	Thermodynamics
Subject	Physics
Class	Class 11
Answer Type	Text solution:1
Upvotes	99

Text solutionVerified

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