Q7. Thirty joules of heat flow into a system. The system in turn does 50 Joules of work. The internal energy of the system has:Physics — Heat and Thermodynamics — Question 7 of 415A. Increased by 80 joulesB. Decreased by 80 joulesC. Increased by 20 joulesD. Decreased by 20 joulesE. Remained constantPractice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →