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This test consists of 15 multiple choice questions and 5 short answer questions.

Multiple Choice Questions

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

2. What is the principle that states energy is neither created nor destroyed?
(a) The principle of energy loss.
(b) The principle of energy change.
(c) The principle of the conservation of energy.
(d) The principle of energy gain.

3. What is the principle behind the action of any machine?
(a) The type of energy it takes to make the machine work.
(b) The amount of energy it saves.
(c) The amount of energy it expends.
(d) The conservation of energy.

4. What debris does a nuclear explosion create?
(a) Steam.
(b) Acid rain.
(c) None.
(d) Fallout.

5. Where is steam still used?
(a) In thermal power stations.
(b) In industrial engines.
(c) In water plants.
(d) In some internal combustion engines.

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

7. How does a rocket engine power the craft?
(a) By nuclear fusion.
(b) By the combustion of one propellant.
(c) By the turning of a propeller.
(d) By the combustion of two propellants.

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

9. Why is cold water denser than warm water?
(a) Warm water's molecules move around more loosely.
(b) Cold water's molecules move around more loosely.
(c) Warm water has a greater ability to absorb force.
(d) Cold water has a greater ability to coalesce.

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

11. What do machines that keep something cool do to heat?
(a) Transpose it.
(b) Cause a change in velocity.
(c) Remove it.
(d) Exchange it with cold material.

12. What do you have to use in order to accomplish work with half the effort?
(a) Half the distance.
(b) One-third the distance.
(c) Twice the distance.
(d) Ten percent of the distance multiplied by one-third of the effort.

13. What do compound levers contain?
(a) Two fulcrums and one point of force and load.
(b) A single fulcrum and two points of force and two of load.
(c) Two fulcrums and two points of force and two of load.
(d) No fulcrum but two points of force and two of load.

14. What additional tasks can a boat with two triangular sails do?
(a) Achieve two additional suction forces.
(b) Multiply the suction force by three.
(c) Achieve one additional suction force.
(d) Divide the suction force.

15. Through what can heat not travel?
(a) Very dense elements.
(b) A vacuum.
(c) There is nothing through which heat cannot travel.
(d) Very porous elements.

Short Answer Questions

1. What happens if the force of upthrust is equal to the weight of an object in water?

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

3. What does the inclined plane do?

4. What is an absence of substance?

5. What happens when an object is placed in water?

(see the answer keys)

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