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This test consists of 5 multiple choice questions, 5 short answer questions, and 10 short essay questions.

Multiple Choice Questions

1. What do the double walls of a thermos enclose?
(a) A vacuum.
(b) Argon.
(c) Nitrogen.
(d) Oxygen.

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

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

4. Upon what does the amount of upthrust of an object in water depend?
(a) On what the water's electrical charge is.
(b) On what the object's salinity is.
(c) On whether or not the object is greater than one centimeter in diameter.
(d) On how much water the object displaces.

5. Upon what principle does a pulley work?
(a) It is easier to pull something down rather than up.
(b) The amount of work required is halved by the amount of effort.
(c) The rotation of one gear pulls the other.
(d) It is easier to overcome gravity than force.

Short Answer Questions

1. What is the principle that states energy is neither created nor destroyed?

2. What turns the crankshaft in an internal combustion engine?

3. What is applied to a lever to make it move?

4. Where are wheels and axles found?

5. What is any engine that burns fuel inside the engine?

Short Essay Questions

1. How does the atom bomb work?

2. Discuss the concept of floating.

3. What rays does the sun emit? How do those rays react to an object?

4. Discuss what happens when a driving force initiates movement.

5. Explain thermal radiation.

6. How do the rotor blades on a helicopter work?

7. How is nuclear power generated? What is one naturally occurring nuclear fusion?

8. Discuss the two principles upon which propellers and rudders work in a boat.

9. Discuss how sails are used on a boat.

10. Discuss fulcrum points as pertaining to levers.

(see the answer keys)

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