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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. Through what can heat not travel?
(a) Very dense elements.
(b) A vacuum.
(c) Very porous elements.
(d) There is nothing through which heat cannot travel.

2. What is the type of electricity when electrons travel through a conductor such as metal?
(a) Direct electricity.
(b) Static electricity.
(c) Wave electricity.
(d) Current electricity.

3. Why do electromagnets use the forces of attraction and repulsion alternately to keep machines running?
(a) Because electrons are always positively charged.
(b) Because an electrical current can only stay polarized.
(c) Because electrons inherently move towards neutrality.
(d) Because electrical current can be reversed or shut off.

4. When a magnetic field flows from a magnet into metal what is pulled together?
(a) The magnet and the current.
(b) The metal and magnet.
(c) The metal and the current.
(d) Nothing.

5. What do the double walls of a thermos enclose?
(a) Argon.
(b) Nitrogen.
(c) A vacuum.
(d) Oxygen.

Short Answer Questions

1. What are tanks that take in water to increase the density of the craft?

2. What are small propellers mounted in the base of a ship's hull?

3. How is magnetism created?

4. How does a rocket engine power the craft?

5. What is essential for running an autopilot program?

(see the answer key)

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