2.1.6

Question 5 Which of the following statements agrees with the second law of thermodynamics? A.Energy tends to increase.B.Heat flows spontaneously from cold to hot.C.Heat cannot ever go from cold to hot.D.Entropy tends to increase. 

Question 6 What is entropy? A.Work done on a systemB.A measure of the efficiency of a systemC.Heat flowing from cold to hotD.A measure of the randomness of a system 

Question 7 What is the efficiency of an engine that does 20 J of work and exhausts 80 J of heat while taking in 100 J of heat? Use . A.25%B.20%C.10%D.80% 

Question 8 Which of the following is not permitted, based on the second law of thermodynamics? A.Heat flowing from hot to coldB.A machine that is 80% efficientC.Heat flowing from cold to hotD.Heat being completely converted into mechanical energy 

Question 9 Which of the following describes the work done by a heat engine? A.Heat input minus heat outputB.Heat input minus workC.Heat input plus heat outputD.Heat output minus heat input Question 10 A heat engine is used to convert heat into which of the following? A.LightB.Internal energyC.EntropyD.Work