Q138 / 160 · AP EAMCET 2024 (23 May Shift 1) · Physics

A gas absorbs 18 J of heat and work done on the gas is 12 J, Then the change in internal energy of the gas

A
24 J
B
36 J
C
6 J
Correct answer
D
30 J

Solution

For the gas, $\mathrm{Q}=18 \mathrm{~J}, \mathrm{~W}=-12 \mathrm{~J}$ $\therefore \quad$ Change in internal energy, $\Delta \mathrm{U}=\Delta \mathrm{Q}-\mathrm{W}=18-(-12)=30 \mathrm{~J}$

Hence, the correct answer is option: 'D'.

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