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This test consists of 5 multiple choice questions, 5 short answer questions, and 10 short essay questions.

Multiple Choice Questions

1. What is convection?
(a) Heat moving from a liquid or gas molecule to another.
(b) When heat causes wind.
(c) The way a molecule radiates heat.
(d) When heat increases velocity.

2. What does a driving force initiate?
(a) Work.
(b) Movement.
(c) Inertia.
(d) Electron activity.

3. What is another type of wedge the author mentions?
(a) The caliper.
(b) The gate latch.
(c) The sharp tapered edge of axes.
(d) The inversion ring.

4. The rack and pinion is an example of ______________.
(a) A wedge.
(b) A lever.
(c) A gear.
(d) A stifle.

5. What urges do molecules possess?
(a) The urge to huddle together or spread apart.
(b) Only the urge to spread apart.
(c) None.
(d) Only the urge to huddle together.

Short Answer Questions

1. What is a first-class lever?

2. What is suction referred to in the act of flying?

3. How does a ship vary in density?

4. What is a wheel and rod attacked by a hinge?

5. What is the density of salt water compared to fresh water?

Short Essay Questions

1. How does the atom bomb work?

2. Define combustion. How is combustion used?

3. What is the main focus of the first section of Part 2, Harnessing the Elements?

4. Discuss the two principles upon which propellers and rudders work in a boat.

5. Describe how a door wedge works.

6. How does the inclined plane require less strength for a task?

7. Discuss what happens when a driving force initiates movement.

8. Discuss the four types of gears.

9. How do power crafts control their direction?

10. Explain thermal radiation.

(see the answer keys)

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