Question

In an isothermal process 30 joule of work is performed by gas, the amount of heat supplied to the gas is

• A. 30 J
• B. 40 J
• C. 15 J
• D. 60 J

Answer 1

The correct option is A 30 J

In an isothermal process, Temperature remains constant and change in temperature is zero.

Thus, Change in internal energy =0

From the first law of thermodynamics,

$\Delta U=Q+W$

$\Rightarrow 0=Q+(-30)$

Therefore, Q= 30 J

Hence, the correct option is A.