1. How is electricity created?
(a) From the movement of electrons.
(b) From the movement of quarks.
(c) From the movement of protons.
(d) From the movement of quantums.

2. In how many elements did the Greek believe?
(a) Four.
(b) Eight.
(c) Seven.
(d) Three.

3. What happens if the edges of the two wheels touch?
(a) The one wheel will wear out faster than the other.
(b) Nothing unless they have cams.
(c) The rotation of one will cause the other to rotate.
(d) The one will stop the other wheel.

4. What is a core of wire wound around an iron core?
(a) A bushing coil.
(b) A demagnitizer.
(c) An electromagnet.
(d) An altimeter.

5. What causes expansion?
(a) Inertia.
(b) Gravity.
(c) Cold.
(d) Heat.

Short Answer Questions

1. What principle is in use as a propeller pushes the water back and as that same water which has been pushed back rolls forward again and hits the propeller?

2. What do you have to use in order to accomplish work with half the effort?

3. Where can the electromagnetic fields exist that sound waves cannot?

4. How does a wedge move an object up an inclined plane?

5. How many types of gears are there?

(see the answer key)

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