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This quiz consists of 5 multiple choice and 5 short answer questions through Part 2, Harnassing the Elements, Exploiting Heat, Nuclear Power, pp. 142-173.

Multiple Choice Questions

1. What urges do molecules possess?
(a) Only the urge to huddle together.
(b) None.
(c) The urge to huddle together or spread apart.
(d) Only the urge to spread apart.

2. What does the picture of a mammoth pulling a merry-go-round illustrate?
(a) Blocks and tackles.
(b) Levers.
(c) Gears and belts.
(d) Wedges.

3. Under normal circumstances, what force(s) does a molecule possess?
(a) The force of energy times matter.
(b) The force of electron splitting.
(c) An attracting force and a repelling force.
(d) The force to overcome inertia.

4. What imparts movement into the air or water around them on a ship?
(a) Propellers.
(b) Bits.
(c) Levers.
(d) Cams.

5. When an object absorbs light rays, how is the energy held in the object?
(a) As heat.
(b) As kinetic energy.
(c) There is no energy involved.
(d) As inertial energy.

Short Answer Questions

1. How does a zipper operate?

2. What is the density of salt water compared to fresh water?

3. How does a rocket engine power the craft?

4. What is an absence of substance?

5. What is the result of a collision of molecules which break on impact forming new and different molecules?

(see the answer key)

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