Thermodynamics Question 176
Question: A gas is compressed at a constant pressure of $ 50N/m^{2} $ from a volume of $ 10m^{3} $ to a volume of $ 4m^{3} $ . Energy of 100 J then added to the gas by heating. Its internal energy is
[MNR 1994]
Options:
A) Increased by 400 J
B) Increased by 200 J
C) Increased by 100 J
D) Decreased by 200 J
Show Answer
Answer:
Correct Answer: A
Solution:
From FLOT $ \Delta Q=\Delta U+\Delta W $
$ =\Delta U+P\Delta V $
$ \Rightarrow \ 100=\Delta U+50\times (4-10)\Rightarrow \Delta U=400\ J $
