The internal energy of a system remains constant when it undergoes
(i) a cyclic process
(ii) an isothermal process
(iii) an adiabatic process
(iv) any process in which the heat given out by the system equal to the work done on the system

Options

A. (i),(iii)
B. (ii)
C. (ii),(iv)
D. (i),(ii),(iv)

Answer

B

Explanation

Internal energy remains constant in isothermal process.
In cyclic process, change in internal energy `DeltaU=0`