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This quiz consists of 5 multiple choice and 5 short answer questions through Part Four: Electricity and Automation.

Multiple Choice Questions

1. What is the principle behind the action of any machine?
(a) The conservation of energy.
(b) The type of energy it takes to make the machine work.
(c) The amount of energy it saves.
(d) The amount of energy it expends.

2. The speed of the vibration affects ____________.
(a) The density.
(b) The pattern.
(c) The foil.
(d) The wavelength.

3. What causes electrons to move?
(a) Ectoplasma.
(b) Energy.
(c) Electrostatics.
(d) The attraction to the proton.

4. How do oppositely charged electrons respond to each other?
(a) They repel each other.
(b) They attract each other.
(c) They absorb each other and become neutral.
(d) Nothing.

5. What does the inclined plane do?
(a) Decreases effort.
(b) Increases effort.
(c) Extends the distance to a rise.
(d) Decreases gravitational force.

Short Answer Questions

1. Why can a dog hear a dog whistle that humans cannot?

2. What is an example of a second-class lever?

3. What happens when a magnetic field flows from a magnet into metal?

4. What occurs when molecules begin vibrating in a solid, then speed up their vibration when heated?

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

(see the answer key)

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