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Nat Sci > Basic Physics > Flashcards

Basic Physics Flashcards

1
Q
  1. If the temperature of a confined liquid is held constant and its pressure is tripled, the volume will

a. Triple
b. Be reduced to one third its original volume
c. Remain the same

A

c. Remain the same

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2
Q
  1. Which atmospheric conditions will cause the true landing speed of an aircraft to be the greatest?

a. Low temperature with low humidity
b. High temperature with low humidity
c. High temperature with high humidity

A

c. High temperature with high humidity

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3
Q
  1. The desire effect of using winglets on an aircraft’s wingtips is to

a. Increase the lift to drag ratio
b. reduce the aspect ratio
c. Optimize wing dihedral and improve lateral stability

A

a. Increase the lift to drag ratio

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4
Q
  1. Under which conditions will the rate of flow of a liquid through a metering orifice (or jet) be the greatest (all other factors being equal)?

a. Unmetered pressure, 18 PSI; metered pressure, 17.5 PSI; atmospheric pressure 14.5 PSI
b. Unmetered pressure, 23 PSI; metered pressure, 12 PSI; atmospheric pressure 14.3 PSI
c. Unmetered pressure, 17 PSI; metered pressure, 5 PSI; atmospheric pressure, 14.7 PSI

A

c. Unmetered pressure, 17 PSI; metered pressure, 5 PSI; atmospheric pressure, 14.7 PSI

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5
Q
  1. If a double acting actuating cylinder in a 3000 psi system has a piston with a surface area 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?

a. 9,000 pounds
b. 6,000 pounds
c. 3,000 pounds

A

b. 6,000 pounds

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6
Q
  1. Which of the following is newton’s first law of motion, generally termed the law of inertia

a. To every action is an equal and opposite reaction
b. Force is proportional to the product of mass and acceleration
c. Everybody persists in its state of rest, or of motion in a straight line, unless acted upon by some force.

A

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

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7
Q
  1. Aspect ratio of a wing is defined as the ratio of the

a. Wingspan to the wing root
b. Square of the chord to the wingspan
c. Wingspan to the mean chord

A

c. Wingspan to the mean chord

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8
Q
  1. An engine that weighs 350 pounds is removed from an aircraft by means of a mobile hoist. The engine is raised 3 feet above its attachment mount, and the entire assembly is then moved forward 12 feet. Constant force of 70 pounds is required to move the loaded hoist. What is the total work input required to move the hoist?

a. 840 foot pounds
b. 1,890 foot pounds
c. 1,050 foot pounds

A

a. 840 foot pounds

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9
Q
  1. In physics, which of the following factors are necessary to determine power?
  2. Force exerted
  3. Distance moved
  4. Time required

a. 1 and 2
b. 2 and 3
c. 1,2 and 3

A

c. 1,2 and 3

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10
Q
  1. The speed of sound in the atmosphere is most affected by variations in which of the following?

a. Sound frequency (cps)
b. Ambient temperature
c. Barometric pressure

A

b. Ambient temperature

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11
Q
  1. What is absolute humidity?

a. The temperature to which humid air must be cooled at constant pressure to become statured.
b. The actual amount of the water vapor in a mixture of air and water.
c. 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.

A

b. The actual amount of water vapor in a mixture of air and water.

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12
Q
  1. If all or a significant part of a stall strip is missing on an airplane wing, a likely result will be.

a. Asymmetrical lateral control at a near stall angles of attack
b. Decreased lift in the area of installation at high angles
c. Asymmetrical lateral control at low angles of attack.

A

a. Asymmetrical lateral control at a near stall angles of attack

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13
Q
  1. If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the temperature remains constant)

a. Increase in direct proportion to the volume increase
b. Remain the same
c. Be reduced to one half its original value

A

c. Be reduced to one half its original value

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14
Q
  1. An airplane wing is designed to produce lift resulting from

a. A positive air pressure below and above the wing’s surface along with the downward deflection of air
b. Positive air pressure below the wing’s surface and negative air pressure above the wing’s surface along with the downward deflection of air.
c. Negative air pressure below the wing’s surface and positive air pressure above the wing’s surface along with the downward deflection of air.

A

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

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15
Q
  1. The purpose of aircraft wing dihedral is to

a. Increase lateral stability
b. Increase longitudinal stability
c. Increase lift coefficient of the wing

A

a. Increase lateral stability

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16
Q
  1. If both the volume and the absolute temperature of a confined gas are doubled, the pressure will

a. Not change
b. Be halved
c. Become four times as great

A

a. Not change

17
Q
  1. The boiling point of a given liquid varies

a. Directly with pressure
b. Inversely with pressure
c. Directly with density

A

a. Directly with pressure

18
Q
  1. The temperature to which humid air must be cooled at constant pressure to become saturated is called

a. Dew point
b. Absolute humidity
c. Relative humidity

A

a. Dew point

19
Q
  1. The speed of sound in the atmosphere

a. Varies according to the frequency of the sound
b. Changes with a change in temperature
c. Changes with a change in pressure

A

b. Changes with a change in temperature

20
Q
  1. The purpose of stall strips on airplane wings is to

a. Increase lift in the areas of installation
b. Prevent stall in the areas of installation
c. Ensure that the wing root areas stall first

A

c. Ensure that the wing root areas stall first

21
Q
  1. Which statement concerning heat and/or temperature is true?

a. There is an inverse relationship between temperature and heat
b. Temperature is a measure of the kinetic energy of the molecules of any substance
c. Temperature is a measure of the potential energy of the molecules of any substance

A

b. Temperature is a measure of the kinetic energy of the molecules of any substance

22
Q
  1. Which of the following is NOT considered a method of heat transfer?

a. Convection
b. Conduction
c. Diffusion

A

c. Diffusion

23
Q
  1. A wing with very high aspect ratio (in comparison with low aspect ratio wing) will have

a. Increased drag at high angles of attack
b. A low stall speed
c. Poor control qualities at low airspeeds

A

b. A low stall speed

24
Q
  1. How much work input is required to lower (not drop) a 120 pound weight from the top of a 3 foot table to the floor.

a. 120 pounds of force
b. 360 foot-pounds
c. 40 foot-pounds

A

b. 360 foot-pounds

25
Q
  1. What force must be applied to roll a 120 pound barrel up an inclined plane 9 feet long to a height of 3 feet (disregard friction)?
    L / I = R / E
    L = length of ramp, measured along the slope
    I = height of ramp
    R = weight of object to be raised or lowered.
    E = force required to raise or lower object

a. 40 pounds
b. 120 pounds
c. 360 pounds

A

a. 40 pounds

26
Q
  1. Which will weigh the least?

a. 98 parts of dry air and 2 parts of water vapor
b. 35 parts of dry air and 65 parts of water vapor
c. 50 parts of dry air and 50 parts of water vapor

A

b. 35 parts of dry air and 65 parts of water vapor

27
Q
  1. 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

a. Absolute humidity
b. Relative humidity
c. Dewpoint

A

b. Relative humidity

28
Q
  1. If the fluid pressure is 800 psi in a 1/2 inch line supplying an actuating cylinder with a piston area of 10 square inches, the force exerted on the piston will be

a. 4000 pounds
b. 8000 pounds
c. 800 pounds

A

b. 8000 pounds

29
Q
  1. Which condition is actual amount of water vapor in a mixture of air and water?

a. Relative humidity
b. Dewpoint
c. Absolute humidity

A

c. Absolute humidity

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