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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 floats.
(b) The object projects out of the water.
(c) The object sinks.
(d) The object moves across the surface of the water.

2. What is a fulcrum?
(a) A point at which inertia is overcome.
(b) A formula for determining energy needed to do work.
(c) A pivot point.
(d) A special sort of wedge.

3. Towards which direction do electrons move on a magnet?
(a) South pole.
(b) The balance point between the north and south poles.
(c) North pole.
(d) They do not move.

4. What happens when molecules are squeezed or stretched beyond the boundaries of their comfortable balance?
(a) The molecules are driven to remain unbalanced.
(b) The molecules dissipate into individual atoms that can be lost or destroyed.
(c) The molecules are driven to return to that balance.
(d) They remain in an uneasy balance.

5. What is the factor which determines an object's ability to float?
(a) Density.
(b) Volume.
(c) Inertia.
(d) Force.

Short Answer Questions

1. What is another type of wedge the author mentions?

2. In which direction do electrons always travel?

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

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

5. What is the main idea in Part 2 of the book?

(see the answer key)

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