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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 happens when a magnetic field flows from a magnet into metal?
(a) It demagnitizes the metal.
(b) It polarizes the electronic field.
(c) It temporarily makes the metal magnetic.
(d) It bends the electronic field.

2. In the illustration of how electricity is generated by a chemical reaction, what is the end result of the illustration?
(a) The copper turns green and the zinc becomes cloudy.
(b) An electrical shock.
(c) The copper turns green and the zinc turns brown.
(d) A meltdown.

3. What two elements combine to make a body scanner?
(a) Sound waves and radio waves.
(b) Magnetic fields and sound waves.
(c) Magnetic fields and light waves.
(d) Radio waves and magnetic fields.

4. What does increasing heat do to molecules?
(a) It slows them down.
(b) It increases the movement of molecules.
(c) It makes them break apart.
(d) Nothing.

5. What contains one element which is the detonator and another reactive element which acts as the propellant?
(a) Oscillators.
(b) Explosives.
(c) Propellants.
(d) Engines.

Short Answer Questions

1. What causes expansion?

2. What is the main idea in Part 2 of the book?

3. Why do electromagnets use the forces of attraction and repulsion alternately to keep machines running?

4. Why is cold water denser than warm water?

5. How does a rocket engine power the craft?

(see the answer key)

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