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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 if the force of upthrust is equal to the weight of an object in water?
(a) The object moves across the surface of the water.
(b) The object sinks.
(c) The object projects out of the water.
(d) The object floats.

2. Under what situation does the eye perceive a reflection of light?
(a) In looking at a solid.
(b) When the convex lens is distorted.
(c) When the retina has no rods or cones.
(d) When the concave lens is distorted.

3. What are two things a sail can do for a craft?
(a) Give pulpulsion and direction.
(b) Propel and repel.
(c) Lift and Slow.
(d) Propel and stop.

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 is electricity flowing through a wire?
(a) Current.
(b) Watts.
(c) Resistance.
(d) Ohms.

Short Answer Questions

1. What is one type of ray that human eyes cannot perceive?

2. What is the factor which determines an object's ability to float?

3. What is an example of a second-class lever?

4. How does a zipper operate?

5. What do machines that keep something cool do to heat?

(see the answer key)

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