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This quiz consists of 5 multiple choice and 5 short answer questions through Part 2, Harnassing the Elements, Introduction, Floating, Flying and Pressure Power, pp.91-141.

Multiple Choice Questions

1. How many types of gears are there?
(a) Seven.
(b) One.
(c) Five.
(d) Four.

2. 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 Action and Reaction.
(b) The Principle of Gravity.
(c) The Principle of Push and Thrust.
(d) The Principle of Force and Inertia.

3. What happens if the force of upthrust is equal to the weight of an object in water?
(a) The object sinks.
(b) The object floats.
(c) The object moves across the surface of the water.
(d) The object projects out of the water.

4. What is the density of salt water compared to fresh water?
(a) Salt water is denser.
(b) It depends on their electrical charge.
(c) They have the same density.
(d) Fresh water is denser.

5. Upon how many major principles do propellers and rudders work?
(a) One.
(b) Three.
(c) Four.
(d) Two.

Short Answer Questions

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

2. How does a ship vary in density?

3. What is applied to a lever to make it move?

4. Why is cold water denser than warm water?

5. What happens when an object is placed in water?

(see the answer key)

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