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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 principle is in use as a propeller pushes the water back and as that same water which has been pushed back rolls forward again and hits the propeller?
(a) The Principle of Gravity.
(b) The Principle of Action and Reaction.
(c) The Principle of Force and Inertia.
(d) The Principle of Push and Thrust.

2. How does heat travel through heating elements?
(a) Radiation.
(b) Through inertia.
(c) Conduction and convection.
(d) In groups of molecules.

3. What do the double walls of a thermos enclose?
(a) Argon.
(b) Oxygen.
(c) A vacuum.
(d) Nitrogen.

4. What is one component of a lever?
(a) A straight edge.
(b) A caliper.
(c) A spring.
(d) A screw.

5. Through what can heat not travel?
(a) Very porous elements.
(b) A vacuum.
(c) There is nothing through which heat cannot travel.
(d) Very dense elements.

Short Answer Questions

1. Why is cold water denser than warm water?

2. What does one have to understand in order to understand the way things work?

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

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

5. What are tanks that take in water to increase the density of the craft?

(see the answer key)

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