Physics Thermodynamics First Law of Thermodynamics (Delta Q = Delta U + Delta W) MCQ (Single Correct)

In a thermodynamics process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8J of work is done on the gas. If the initial internal energy of the gas was 30J. The final internal energy will be

A
18J
B
9J
C
4.5J
D
36J

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The correct answer is:
A

Given and

⇒ ⇒

⇒ ⇒ = ⇒ ⇒

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