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

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

3. What are small propellers mounted in the base of a ship's hull?
(a) Thrusters.
(b) Stablizers.
(c) Tillers.
(d) Rudders.

4. In flying, what is used to overcome weight from gravity?
(a) Lift created by the airfoil.
(b) Lift created by the rudder.
(c) Lift created by the tiller.
(d) Lift created by the nose.

5. Upon what does the amount of upthrust of an object in water depend?
(a) On what the object's salinity is.
(b) On whether or not the object is greater than one centimeter in diameter.
(c) On what the water's electrical charge is.
(d) On how much water the object displaces.

Short Answer Questions

1. What causes sideways movements of a ship?

2. Why is cold water denser than warm water?

3. What emits both infrared and light rays?

4. What is the most common form of inclined plane found in machines?

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

(see the answer key)

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