Thermodynamics Question 124

Question: If ΔQ and ΔW represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as

[Roorkee 2000]

Options:

A) ΔQ=ΔU+ΔW

B) ΔQ=ΔUΔW

C) ΔQ=ΔWΔU

D) ΔQ=ΔWΔU where ΔU is the internal energy

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Answer:

Correct Answer: B

Solution:

From FLOTΔQ=ΔU+ΔW

Q Heat supplied to the system so DQ Positive and work is done on the system so DW ® Negative Hence +DQ = DU - DW



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