PHY2048 - GENERAL PHYSICS I
REVISION QUESTIONS FOR CHAPTER 19

Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 19, "Heat and the First Law of Thermodynamics". This includes questions on specific heat, change of phase and latent heat, the First Law, work and the PV diagram. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.


Q1: The mass of ice that can be melted by 1g of steam at 100°C is

0.125g
0.148g
6.75g
8.0g
None of the above

Q2: The graph below shows the temperature of a 1.0 g sample of material as heat is added to it.

The material is initially a solid at 10°C. The pressure remains constant, and there is no chemical change. The heat of fusion of the material is

10 cal/g
50 cal/g
30 cal/g
90 cal/g
100 cal/g


Q3: A 5.0 g sample of ice at 0°C falls through a distance of 20.0 meters and undergoes a completely inelastic collision with the earth. If all of the lost mechanical energy is absorbed by the ice, how much of it melts?

2.9 ¥ 10-3 g
4.3 ¥ 10-3 g
7.6 ¥ 10-3 g
1.8 ¥ 10-2 g
2.1 ¥ 10-2 g

Q4: Besides Joule's classic experiment, another way of demonstrating the equivalence between mechanical energy and heat is the following: Put some lead shot into a glass tube, seal both ends of the tube, invert the tube quickly several times, and measure the temperature of the shot. If you assume that all the mechanical energy is converted into heat in the lead shot and that no heat is lost, what is the change in the temperature of the shot if the tube is 1.0 m long, there are 100 g of shot, and the tube is inverted 10 times? (The specific heat of lead is 0.128 kJ/kg.°C.)

0.77°C
0.077°C
2.5°C
7.7°C
0.25°C

Q5: A reversible heat engine has the P-V graph shown below.

The net work performed in one cycle is approximately

zero
2.0 kJ
4.2 kJ
5.5 kJ
10 kJ


Click on the Submit Quiz button below to have your quiz automatically graded.

Please note that you may be able to use the "Back" and "Forward" buttons on your browser to check the answers with the questions.