Question

Equation of the first law of thermodynamics is ________

(a) Internal Energy= Heat added into work done

(b) Internal Energy= Heat rejected into work done

(c) Internal Energy= Heat added divided by work done

(d) Internal Energy=Heat added plus work done

This question was posed to me during an interview.

I would like to ask this question from First Law of Thermodynamics topic in division Fluid Dynamics of Fluid Mechanics

Answer 1

Correct choice is (d) Internal Energy=Heat added plus work done

To explain: It is a thermodynamic expression which gives a relationship between internal energy, heat and work done. Work done on the system is positive, and work done by the system is negative. The standard unit of all these quantities is Joule.