Natural Science - Basic Physics

1. Which statement concerning heat and/or temperature is true?

• The speed of sound in the atmosphere energy of the molecules of any substance

• There is an inverse relationship between temperature and heat

• Temperature is a measure of the kinetic energy of the molecules of any substance

2. The boiling point of a given liquid varies

• Directly with pressure

• Inversely with pressure

• Directly with density

3. If a double acting actuating cylinder in a 3000 psi system has a piston with a surface rea of three square inches on the extension side, and a rod with a cross-section area of one square inch attached to the piston on the other side, approximately how much force will the actuator be able to produce when retracting?

• 9,000 pounds

• 6,000 pounds

• 3,000 pounds

4. Which is the ratio of the water vapor actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure

• Absolute humidity

• Relative humidity

• Dewpoint

5. An airplane wing is designed to produce lift resulting from

• A positive air pressure below and above the wing’s surface along with the downward deflection of air

• Positive air pressure below the wing’s surface and negative air pressure above the wing’s surface along with the downward deflection of air.

• Negative air pressure below the wing’s surface and positive air pressure above the wing’s surface along with the downward defection of air.

6. If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the temperature remains constant)

• Increase In direct proportion to the volume increase

• Remain the same

• Be reduced to one half its original value

7. If all or a significant part of a stall strip is missing on an airplane wing, a likely result will be.

• Asymmetrical lateral control at a near stall angles of attack

• Decreased lift In the area of installation at high angles

• Asymmetrical lateral control at low angles of attack.

8. If the temperature of a confined liquid is held constant and its pressure is tripled, the volume will

• Triple

• Be reduced to one third its original volume

• Remain the same

9. Which atmospheric conditions will cause the true landing speed of an aircraft to be the greatest?

• Low temperature with low humidity

• High temperature with low humidity

• High temperature with high humidity

10. Which of the following is newton’s first law of motion, generally termed the law of inertia

• To every action is an equal and opposite reaction

• Force is proportional to the product of mass and acceleration

• Everybody persists in its state of rest, or of motion in a straight line, unless acted upon by some force.