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

2. How many ways can heat travel?
(a) One.
(b) Two.
(c) Three.
(d) Four.

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

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

5. What is the magnetic field caused by an electric force?
(a) Motive force.
(b) Positron force.
(c) Neutrino force.
(d) Polar force.

Short Answer Questions

1. What debris does a nuclear explosion create?

2. What is one thing an electrical current can measure?

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

4. Towards which direction do electrons move on a magnet?

5. What additional tasks can a boat with two triangular sails do?

(see the answer key)

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