Question

The increase in internal energy of a system is equal to the work done in the system. Which process does the system undergo?

(a) Isochoric

(b) Adiabatic

(c) Isobaric

(d) Isothermal

I had been asked this question in an online interview.

My question is based upon Thermodynamics in portion Kinetic Theory of Gases of Engineering Physics I

Answer 1

Right choice is (b) Adiabatic

The explanation: As work done on a system is negative, so ∆U=-∆W or ∆U+∆W=0 or ∆Q=0. Hence the system undergoes an adiabatic process.