Question

If a gas is compressed adiabatically by doing work of 150 J, the change in the internal energy of the gas is:

• A. 100 J
• B. 150 J
• C. 200 J
• D. 250 J

Answer 1

Answer: (B)

150 J

First low of Thermodynamics -

$dQ=dU+dW$

$dW=150$

$dQ=0$ (adiabatic)

$dU=dQ-dW$

$=-150$

change in internal energy $=\left|dU\right|=150J$