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First Law Of Thermodynamics MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

Quick Facts

  • First law of Thermodynamics is considered one of the most asked concept.

  • 27 Questions around this concept.

Solve by difficulty

Which of the following is incorrect regarding the first law of thermodynamics?

In a given process of an ideal gas dW=0 and dQ<0. Then for the gas

An ideal gas is taken via path as shown in figure. The net work done in the whole cycle is

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Concepts Covered - 1

First law of Thermodynamics

First law of thermodynamics - 

According to it heat given to a system (Q) is equal to the sum of increase in its internal energy (U) and the work done (W) by the system against the surroundings.

                                \Delta Q = \Delta U + \Delta W

                                              or For cyclic process

                               \sum \Delta Q = \sum \Delta W

 

Drawback of First law of thermodynamics -

  • First law of thermodynamics does not tell us reason about the direction of heat transfer.

 

Important points - 

  1. Q and W are the path functions but U is the point function.

  2. First law of thermodynamics introduces the concept of internal energy.

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First law of Thermodynamics

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First law of Thermodynamics

Physics Part II Textbook for Class XI

Page No. : 307

Line : 51

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