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

Multiple Choice Questions

1. What happens when an object is placed in water?
(a) The water molecules push against the object.
(b) The object absorbs the water's atoms.
(c) The water is repelled by the electrical force of the object.
(d) The object sinks.

2. What is the action of something burning?
(a) Combustion.
(b) Radiation.
(c) Molecular deceleration.
(d) Convection.

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

4. What is another type of wedge the author mentions?
(a) The caliper.
(b) The gate latch.
(c) The sharp tapered edge of axes.
(d) The inversion ring.

5. 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) Divide the suction force.
(d) Achieve one additional suction force.

6. What causes increased heat in the process of conduction?
(a) Fission.
(b) Increased movement.
(c) Fusion.
(d) Electronic transfers.

7. What is the effort you put in combined with the distance over which the effort is done?
(a) Work.
(b) Gravity.
(c) Rest.
(d) Mendal's law.

8. What is applied to a lever to make it move?
(a) Balance.
(b) Gravitational pull.
(c) Force.
(d) Work.

9. What are tanks that take in water to increase the density of the craft?
(a) Bilge.
(b) Ballast.
(c) Rolling.
(d) Variable.

10. What contains one element which is the detonator and another reactive element which acts as the propellant?
(a) Explosives.
(b) Oscillators.
(c) Propellants.
(d) Engines.

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

12. What happens when you exert your strength across a longer distance?
(a) Nothing happens. It is all balanced by the decreased work required.
(b) Your effort is reduced, but your strength has to be increased.
(c) Your effort is reduced so you can take advantage of your greater strength.
(d) Your effort is reduced, and your lesser strength becomes sufficient.

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

14. What is the result of a collision of molecules which break on impact forming new and different molecules?
(a) Radiation.
(b) Combustion.
(c) Fusion.
(d) Fission.

15. What is an object's weight divided by its volume?
(a) The object's constant mass.
(b) An object's elemental number.
(c) The object's ability to exert force.
(d) An object's density.

Short Answer Questions

1. In how many elements did the Greek believe?

2. What pumps refrigerant out in an air conditioner?

3. What are two things a sail can do for a craft?

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

5. What forms a molecule?

(see the answer keys)

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