AP EAMCET Engineering 21 Sep 2020 Shift 2 Paper

(b) According to first law of thermodynamics,
dQ=dW+dU‌‌.....(i)
For isothermal process, there is no change in internal energy.
Hence, ‌‌dU=0
∴ From Eq. (i), we get
dQ=dW
Hence, above equation holds good for isothermal process.