PHYSICS FUNDA I NAT SCI

HUWAG HULAAN

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

A. Be reduced to one-third its original volume.

B. Triple.

C. Remain the same.

C. Remain the same.

An engine is removed from an aircraft by means of a mobile hoist. The engine is raised above its attachment

mount, and the entire assembly is then moved forward 12 feet. A constant force of 70 pounds is required to

move the loaded hoist. What is the total work input required to move the hoist?

A. 1,050 foot-pounds

B. 840 foot-pounds

C. 1,890 foot-pounds

B. 840 foot-pounds

What is absolute humidity?

A. The temperature to which humid air must be cooled at constant pressure to become saturated.

B. 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.

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

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

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. Dewpoint

B. Relative humidity

C. Absolute humidity

B. Relative humidity

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

C. Every body persists in its state of rest, or of motion in a straight line, unless acted upon by some force.

Which statement concerning heat and/or temperature is true?

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

B. Temperature is a measure of the potential energy of the molecules of ® any substance.

C. There is an inverse relationship between temperature and heat.

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

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.

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

The boiling point of a given liquid varies

A. Inversely with pressure.

B. Directly with pressure.

C. Directly with density.

B. Directly with pressure.

An airplane wing is designed to produce lift resulting from

A. Negative air pressure below the wing's surface and positive air pressure 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. 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

The purpose of aircraft wing dihedral is to

A. Increase lift coefficient of the wing.

B. Increase lateral stability.

C. Increase longitudinal stability.

B. Increase lateral stability.

Aspect ratio of a wing is defined as the ratio of the

A. Wingspan to the mean chord.

B. Wingspan to the wing root.

C. Square of the chord to the wingspan.

A. Wingspan to the mean chord.

A wing with a very high aspect ratio (in comparison with a 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.

B. A low stall speed.

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

A. Relative humidity

B. Absolute humidity

C. Dewpoint

C. Dewpoint

The desired effect of using winglets on an aircraft's wingtips is to

A. Reduce the aspect ratio.

B. Increase the lift to drag ratio.

C. Optimize wing dihedral and improve lateral stability.

B. Increase the lift to drag ratio.

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

B. Ambient temperature

How is lift achieved?

A. Equal pressure on both upper and lower wing surfaces.

B. Greater pressure differential between lower surface and upper surface.

C. Lesser pressure differential between lower surface and upper surface.

B. Greater pressure differential between lower surface and upper surface.

The purpose of stall strips on airplane wings is to

A. Increase lift in the areas of installation.

B. Ensure that the wing root areas stall first.

C. Prevent stall in the areas of installation.

B. Ensure that the wing root areas stall first.

Which condition is the actual amount of water vapor in a mixture of air and water?

A. Absolute humidity

B. Dewpoint

C. Relative humidity

A. Absolute humidity

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

A. Be halved.

B. Not change.

C. Become four times as great.

B. Not change.

The speed of sound in the atmosphere

A. Changes with a change in pressure.

B. Varies according to the frequency of the sound.

C. Changes with a change in temperature.

C. Changes with a change in temperature.

If a double acting actuating cylinder in a 3,000 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. 6,000 pounds

B. 3,000 pounds

C. 9,000 pounds

A. 6,000 pounds

If the volume of a confined gas is doubled (without the addition of more gas), the pressure will (assume the

temperature remains constant)

A. Be reduced to one half its original value.

B. Remain the same.

C. Increase In direct proportion to the volume increase.

A. Be reduced to one half its original value.

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. 4,000 pounds

B. 8,000 pounds

C. 800 pounds

B. 8,000 pounds

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

B. 360 foot-pounds

Which of the following statements are correct?

A. When the cyclic pitch control lever is raised, the blade angle of all the rotor blades increases uniformly

and they create the lift that allows the helicopter to take off vertically.

B. When the collective pitch control lever is raised, the blade angle of all the rotor blades increases

uniformly and they create the lift that allows the helicopter to take off vertically.

C. When the collective pitch control ever is raised, the blade angle of the aft rotor blades decreases

uniformly and they create the lift that allows the helicopter to take off vertically.

B. When the collective pitch control lever is raised, the blade angle of all the rotor blades increases

The main rotor system on a helicopter is classified in three groups.

Which of those listed is NOT one of these groups?

A. The flexible-beam rotor system.

B. The semi-rigid rotor system.

C. The fully articulated rotor system.

A. The flexible-beam rotor system.

In physics, which of the following factors are necessary to determine power?

1. Force exerted

2. Distance moved

3. Time required

A. 1, 2 and 3

B. 1 and 2

C. 2 and 3

A. 1, 2 and 3

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 low angles of attack.

B. Asymmetrical lateral control at or near stall angles of attack.

C. Decreased lift in the area of installation at high angles of attack.

B. Asymmetrical lateral control at or near stall angles of attack.

Which of the following is NOT considered a method of heat transfer?

A. Diffusion

B. Conduction

C. Convection

A. Diffusion

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 the ramp, measured along the slope.

1 = Height of the ramp.

R = Weight of object to be raised or lowered.

E = Force required to raise or lower object.

A. 350 pounds

B. 120 pounds

C. 40 pounds

C. 40 pounds

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.

C. High temperature with high humidity.

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, 17 PSI; metered pressure, 5 PSI; atmospheric ® pressure, 14.7 PSI

B. Unmetered pressure, 23 PSI; metered pressure, 12 PSI; atmospheric pressure 14.3 PSI

C. Unmetered pressure, 18 PSI; metered pressure, 17.5 PSI; atmospheric pressure 14.5 PSI

A. Unmetered pressure, 17 PSI; metered pressure, 5 PSI; atmospheric ® pressure, 14.7 PSI