1. What do sensors and detectors measure?
(a) Only light rays.
(b) Only electrical waves.
(c) Only electrical currents.
(d) Electrical currents, rays, and waves.

2. What is one phenomenon a measurement of force measures?
(a) Pull pressure.
(b) Earthquakes.
(c) Push pressure.
(d) Vise pressure.

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

4. In flying, what is used to overcome weight from gravity?
(a) Lift created by the nose.
(b) Lift created by the rudder.
(c) Lift created by the airfoil.
(d) Lift created by the tiller.

5. What emits both infrared and light rays?
(a) A planet.
(b) A light bulb.
(c) The sun.
(d) The moon.

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 causes sideways movements of a ship?

3. What does RADAR use?

4. How is magnetism created?

5. What is an object's weight divided by its volume?

(see the answer key)

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