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This quiz consists of 5 multiple choice and 5 short answer questions through Part 2, Harnassing the Elements, Exploiting Heat, Nuclear Power, pp. 142-173.

Multiple Choice Questions

1. What occurs when molecules begin vibrating in a solid, then speed up their vibration when heated?
(a) Internal combustion.
(b) Solid combustion.
(c) Conduction.
(d) Radiation.

2. What principle does a thermostat use?
(a) The law of electronic fission.
(b) The third principle of thermonectics.
(c) The principle that heat causes expansion.
(d) The principle of entropy.

3. Where is steam still used?
(a) In industrial engines.
(b) In some internal combustion engines.
(c) In water plants.
(d) In thermal power stations.

4. What is electricity flowing through a wire?
(a) Ohms.
(b) Watts.
(c) Current.
(d) Resistance.

5. How does a ship vary in density?
(a) According to its load.
(b) According to how long it takes to get underway.
(c) According to how much water is on board.
(d) According to the speed it is making.

Short Answer Questions

1. What is one example the author uses of a wedge?

2. Why is cold water denser than warm water?

3. What is the factor which determines an object's ability to float?

4. What happens if the force of upthrust is equal to the weight of an object in water?

5. What is the principle behind the action of any machine?

(see the answer key)

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