Author Question: The auxiliary power unit (APU) on a jetliner is a generator and operates on the principle of ... (Read 35 times)

nramada · **on:** Jul 29, 2018

The auxiliary power unit (APU) on a jetliner is a generator and operates on the principle of __________________
Fill in the blank(s) with correct word

Question 2

Modern aircraft weather radars operate in the _____________ portion of the EM spectrum.
Fill in the blank(s) with correct word

Question 3

The radio waves used to communicate with astronauts in space must be ___________ frequency waves.
Fill in the blank(s) with correct word

Question 4

TV remote controls use ________ radiation.
Fill in the blank(s) with correct word

Question 5

A superconductor expels any magnetic field from its interior. This is called __________.
Fill in the blank(s) with correct word

Question 6

A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because of __________.
Fill in the blank(s) with correct word

Question 7

A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because of __________.
Fill in the blank(s) with correct word

Question 8

The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is __________.
Fill in the blank(s) with correct word

Question 9

If we see two objects that have different colors, the light waves coming from them have different ____________
Fill in the blank(s) with correct word

Question 10

__________ are emitted when high speed electrons decelerate as they are smashed into a metal target.
Fill in the blank(s) with correct word

Question 11

Lower frequency radio waves are reflected back to Earth by the ______________.
Fill in the blank(s) with correct word

Question 12

The type of EM radiation that has wavelength just a bit longer than that of visible light is __________.
Fill in the blank(s) with correct word

Question 13

The type of EM radiation that has wavelength just a bit shorter than that of visible light is __________.
Fill in the blank(s) with correct word

Question 14

__________ radiation causes your skin to tan.
Fill in the blank(s) with correct word

Question 15

The type of EM wave having the highest frequency is __________.
Fill in the blank(s) with correct word

Question 16

The type of EM waves used in radar is __________.
Fill in the blank(s) with correct word

Question 17

A glowing blackbody that appears bluish in color is __________ than one that appears reddish.
Fill in the blank(s) with correct word

Question 18

The total radiant power emitted by a blackbody is proportional to its _________________ raised to the fourth power.
Fill in the blank(s) with correct word

Question 19

__________ radiation is emitted from a small hole in a furnace.
Fill in the blank(s) with correct word

Question 20

The main form of radiation that our bodies emit is __________.
Fill in the blank(s) with correct word

Question 21

The increase in the amount of carbon dioxide in the atmosphere is responsible for __________.
Fill in the blank(s) with correct word

Question 22

The greenhouse effect occurs because carbon dioxide in the atmosphere absorbs __________ radiation.
Fill in the blank(s) with correct word

Question 23

The ozone layer absorbs __________ radiation from sunlight.
Fill in the blank(s) with correct word

Question 24

The ionosphere reflects __________ frequency radio waves.
Fill in the blank(s) with correct word

Question 25

Three devices that use electromagnetic induction in their operation are __________, __________, and __________.
Fill in the blank(s) with correct word

Question 26

The direction of a magnetic field at a point can be determined by __________.
Fill in the blank(s) with correct word

Question 27

Greenhouse gasses include
a. water vapor. b. CO2.
c. CO. d. methane.

Question 28

Which recording formats employ magnetism?
a. videotape b. CD
c. DVD d. floppy disk

Question 29

What makes an ordinary bar magnet magnetic?
a. Electrons inside it are themselves tiny magnets.
b. The magnetic fields of electrons in the magnet are aligned and add together.
c. It contains magnetic charges.
d. none of the above

Question 30

EM waves in a vacuum travel at a speed
a. of c.
b. varying with their wavelength.
c. varying with their intensity.
d. of 299,792,458 m/s.

Question 31

A magnetic field will be produced at a point in space if an electric field at that point
a. exists.
b. gets stronger.
c. gets weaker.
d. changes direction.
e. all of the above

Question 32

The direction of the force on an electric charge in a magnetic field is
a. in the direction of the magnetic field.
b. in the direction of motion of the charge.
c. perpendicular to the magnetic field.
d. perpendicular to the direction of motion of the charge.
e. none of the above.

Question 33

The type of EM wave used in aircraft radar is
a. radio waves. b. microwaves.
c. x-rays. d. gamma rays.

Question 34

The type of radiation affected by greenhouse gasses is
a. UV radiation. b. IR radiation.
c. visible radiation. d. gamma radiation.

Question 35

The ionosphere reflects
a. microwaves. b. AM radio waves.
c. FM radio waves. d. x-rays.

Question 36

An object at an initial temperature of 27 oC is raised to a temperature of 877 oC. How much more energy does the object emit as blackbody radiation at the higher temperature compared to the lower temperature?
a. 32.5 b. 215.9
c. 864.5 d. 1,113,123

Question 37

The magnetic compass in an aircraft points to the ______________ pole.
a. magnetic north b. magnetic south
c. geographic north d. geographic south

Question 38

Making a digital recording of a sound involves
a. analog-to-digital conversion. b. digital-to-analog conversion.
c. electromagnetic waves. d. all of the above.

Question 39

A current can be made to flow in a wire if
a. it is connected to a battery. b. it is put into motion near a magnet.
c. a magnet is put into motion near it. d. all of the above.

Question 40

A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because
a. the coil acts like a transformer.
b. the free electrons in the conductor experience a force when they move in the magnetic field.
c. an electromagnetic wave is generated.
d. the wire is ferromagnetic.
e. none of the above.

Question 41

A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because
a. the coil acts like a transformer.
b. the changing magnetic field induces an electric field in the wire.
c. an electromagnetic wave is generated.
d. the wire is ferromagnetic.
e. none of the above

Question 42

What does IR stand for?
a. ultraviolet b. muon neutrino
c. high frequency d. infrared

Question 43

The cosmic background radiation
a. has a blackbody spectrum.
b. has its peak emission in the microwave band.
c. corresponds to a blackbody at a temperature of 2.726 kelvins.
d. all of the above

Question 44

The cosmic background radiation
a. has a blackbody spectrum.
b. has its peak emission in the microwave band.
c. corresponds to a blackbody at a temperature of 2.726 kelvins.
d. all of the above

Question 45

About how hot does something have to get to glow red hot?
a. 375 degrees F b. 800 degrees F
c. 3000 K d. 6000 K

Question 46

For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is the wavelength of the most intense EM radiation at 300 K.
a. 0.0001 times
b. 0.1 times
c. the same as
d. 10 times
e. 10,000 times

Question 47

For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. A body in a room at 300 K is heated to 3,000 K. The amount of energy radiated each second by the body increases by a factor of
a. 10.
b. 100.
c. 1,000.
d. 10,000.
e. 100,000.

Question 48

For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. As the temperature of a body increases,
a. the body gets brighter.
b. the color of the body shifts from red to white.
c. the wavelength of the most intense light decreases.
d. the frequency of the most intense light increases.
e. all the above.

Question 49

For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. If the Kelvin temperature of a body is doubled, the wavelength of the most intense light is ____________ the wavelength originally of the most intense light.
a. 1/16th
b. half
c. the same as
d. 2 times
e. 16 times

Question 50

For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. As the temperature of an object increases, the wavelength of the brightest light emitted
a. increases.
b. decreases.
c. doesn't change.
d. depends on the composition of the body.
e. depends on the size of the body.

Question 51

For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. If the Kelvin temperature of an object is doubled, the amount of radiant energy emitted each second is ____________ the original amount.
a. 1/16th
b. half
c. the same as
d. 2 times
e. 16 times

Question 52

Global warming
a. has not yet been observed.
b. has been caused by increasing levels of carbon dioxide in the atmosphere.
c. has led to a depletion of the ozone layer in the atmosphere.
d. has no serious consequences.

Question 53

What's the Big Bang?
a. the creation of the universe
b. microwave radiation from all directions in the sky
c. the Hubble relation
d. a punk rock band

Question 54

AM radio stations have greater range than FM stations because
a. AM is more efficient than FM.
b. they have more powerful transmitters.
c. their lower frequency radio waves reflect off the ionosphere.
d. none of the above

Question 55

The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is
a. 31.3 m.
b. 3.13 m.
c. 0.313 m.
d. 0.0313 m.
e. none of the above.

Question 56

The type of EM radiation that has wavelength just a bit longer than that of visible light is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. gamma ray.

Question 57

The type of EM radiation that has wavelength just a bit shorter than that of visible light is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. gamma ray.

Question 58

The type of EM radiation emitted when high speed electrons decelerate as they are smashed into a metal target is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. gamma ray.

Question 59

Why would a decrease in the amount of ozone in the atmosphere increase the likelihood of people getting sunburn?
a. Global temperatures would rise
b. More ultraviolet radiation would reach the ground
c. People would be exposed to more infrared radiation
d. The premise is incorrect. Ozone and sunburn are not related

Question 60

FM radio only operates in the frequency range 88 MHz to 108 MHz because
a. higher or lower frequencies are blocked by the ionosphere.
b. higher and lower frequencies are not radio waves.
c. the government set those limits.
d. none of the above

Question 61

The type of EM radiation that causes your skin to tan is
a. ultraviolet.
b. infrared.
c. x-rays.
d. microwave.
e. gamma rays.

Question 62

The EM wave that has the smallest wavelength in this list is
a. ultraviolet.
b. infrared.
c. x-rays.
d. microwave.
e. gamma rays.

Question 63

How can microwave ovens heat food more quickly than conventional ovens?
a. Microwaves give energy directly to the molecules in the food.
b. Conventional ovens must conduct heat from the surface to the interior of the food.
c. Microwaves heat the inside as well as the surface of the food.
d. all of the above

Question 64

Which of the following is not a common use of microwaves?
a. cooking b. medical imaging
c. radar d. communications

Question 65

The highest frequency visible light is
a. violet.
b. red.
c. blue.
d. green.
e. yellow.

Question 66

The lowest frequency visible light is
a. violet.
b. red.
c. blue.
d. green.
e. yellow.

Question 67

The EM wave that has the lowest frequency in this list is
a. ultraviolet.
b. infrared.
c. x-rays.
d. microwave.
e. gamma rays.

Question 68

The type of EM wave having the highest frequency is
a. ultraviolet.
b. infrared.
c. x-rays.
d. microwave.
e. gamma rays.

Question 69

The type of EM waves used in radar is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. blackbody.

Question 70

The radiation emitted from a small hole in a furnace is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. blackbody.

Question 71

The main form of radiation that our bodies emit is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. blackbody.

Question 72

A superconductor expels any magnetic field from its interior. This is called
a. electromagnetic induction.
b. Maxwell's effect.
c. magnetic declination.
d. the Meissner effect.
e. none of the above.

Question 73

Of the following gases, which is the most important contributor to the Earth's greenhouse effect?
a. water vapor b. ozone
c. CFCs d. methane

Question 74

The greenhouse effect is occurring because
a. the ozone layer is being depleted.
b. the amount of carbon dioxide in the atmosphere is increasing.
c. the ionosphere reflects low frequency radiation.
d. more ultraviolet radiation is penetrating the atmosphere.
e. none of the above.

Question 75

The greenhouse effect occurs because
a. low frequency EM waves are reflected from the atmosphere.
b. high frequency EM waves are reflected from the atmosphere.
c. the ozone layer absorbs ultraviolet light.
d. carbon dioxide in the atmosphere absorbs infrared radiation.
e. none of the above

Question 76

The ozone layer
a. reflects all EM waves.
b. reflects high frequency radio waves.
c. reflects low frequency radio waves.
d. is responsible for the greenhouse effect.
e. absorbs ultraviolet light in sunlight.

Question 77

The ionosphere
a. reflects all EM waves.
b. reflects high frequency radio waves.
c. reflects low frequency radio waves.
d. is responsible for the greenhouse effect.
e. absorbs ultraviolet light in sunlight.

Question 78

Electromagnetic induction is used in the operation of
a. generators.
b. transformers.
c. dynamic microphones.
d. regenerative braking.
e. all of the above.

Question 79

An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole.
b. The nail becomes a north pole or a south pole.
c. The magnet exerts an attractive force on the nail.
d. The nail exerts an attractive force on the magnet.
e. The nail is ferromagnetic.

Question 80

A magnetic field is created by an electric charge if the charge is
a. positive.
b. negative.
c. moving.
d. stationary.
e. any of the above.

Question 81

A magnetic field exerts a force on an electric charge if the charge is
a. positive.
b. negative.
c. moving.
d. stationary.
e. any of the above.

Question 82

The direction of a magnetic field at a point can be determined by
a. a generator.
b. a compass.
c. a transformer.
d. electromagnetic induction.
e. none of the above.

Question 83

The deviation from the way a compass needle points from the true north direction is the
a. greenhouse effect.
b. magnetic inclination.
c. magnetic declination.
d. magnetic resonance effect.
e. none of the above

Question 84

Thermograms use ultraviolet radiation to sense heat.
a. True
b. False
Indicate whether the statement is true or false

Question 85

The ionosphere can be used to conduct radio communications over long distances.
a. True
b. False
Indicate whether the statement is true or false

Question 86

Higher frequency radio waves are reflected by the ionosphere.
a. True
b. False
Indicate whether the statement is true or false

Question 87

The magnetic compass in an aircraft points to the geographic North Pole.
a. True
b. False
Indicate whether the statement is true or false

Question 88

N rays do not exist.
a. True
b. False
Indicate whether the statement is true or false

Question 89

AM radio stations have greater range than FM stations because they have more powerful transmitters.
a. True
b. False
Indicate whether the statement is true or false

Question 90

A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current because the free electrons in the moving wire experience a force from the magnetic field that pushes them through the wire.
a. True
b. False
Indicate whether the statement is true or false

Question 91

A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current because of electromagnetic induction.
a. True
b. False
Indicate whether the statement is true or false

Question 92

A changing magnetic field produces an electric field.
a. True
b. False
Indicate whether the statement is true or false

Question 93

The cosmic background radiation corresponds to a blackbody at a temperature of 2.726 kelvins.
a. True
b. False
Indicate whether the statement is true or false

Question 94

The wavelength of a radio wave from an FM station broadcasting at 93.9 megahertz on your radio dial is 0.313 meters.
a. True
b. False
Indicate whether the statement is true or false

Question 95

The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is 300 meters.
a. True
b. False
Indicate whether the statement is true or false

Question 96

Gamma rays are emitted when high speed electrons decelerate as they are smashed into a metal target.
a. True
b. False
Indicate whether the statement is true or false

Question 97

Blue light has a longer wavelength than red light.
a. True
b. False
Indicate whether the statement is true or false

Question 98

Infrared radiation causes your skin to tan.
a. True
b. False
Indicate whether the statement is true or false

Question 99

EM waves travel at a speed that varies with their wavelength.
a. True
b. False
Indicate whether the statement is true or false

Question 100

Gamma radiation is the highest frequency of EM waves.
a. True
b. False
Indicate whether the statement is true or false

Question 101

Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do.
a. True
b. False
Indicate whether the statement is true or false

Question 102

X rays are used in radar.
a. True
b. False
Indicate whether the statement is true or false

Question 103

Blackbody radiation is emitted from a small hole in a furnace.
a. True
b. False
Indicate whether the statement is true or false

Question 104

The main form of radiation that our bodies emit is ultraviolet.
a. True
b. False
Indicate whether the statement is true or false

Question 105

The frequency of visible light determines its color.
a. True
b. False
Indicate whether the statement is true or false

Question 106

The increase in the amount of carbon dioxide in the atmosphere is contributing to the greenhouse effect.
a. True
b. False
Indicate whether the statement is true or false

Question 107

The greenhouse effect occurs because carbon dioxide in the atmosphere absorbs ultraviolet radiation.
a. True
b. False
Indicate whether the statement is true or false

Question 108

The ozone layer absorbs infrared radiation from sunlight.
a. True
b. False
Indicate whether the statement is true or false

Question 109

The ionosphere reflects high frequency radio waves.
a. True
b. False
Indicate whether the statement is true or false

Question 110

An electric motor can be manually turned and made to act as a generator.
a. True
b. False
Indicate whether the statement is true or false

Question 111

A speaker can be used as a crude microphone.
a. True
b. False
Indicate whether the statement is true or false

Question 112

A transformer only works with AC.
a. True
b. False
Indicate whether the statement is true or false

Question 113

Three devices that use electromagnetic induction in their operation are generators, transformers, and dynamic microphones.
a. True
b. False
Indicate whether the statement is true or false

Question 114

One can reverse the north and south poles of an electromagnet by reversing the direction of current flow through it.
a. True
b. False
Indicate whether the statement is true or false

Question 115

The shape of the magnetic field around a bar magnet is very close to the shape of the electric field around a single positive charge.
a. True
b. False
Indicate whether the statement is true or false

Question 116

Moving electric charges make magnetic fields.
a. True
b. False
Indicate whether the statement is true or false

Question 117

A stationary electric charge produces a magnetic field around it.
a. True
b. False
Indicate whether the statement is true or false

Question 118

There are positive and negative magnetic charges, analogous to positive and negative electric charges.
a. True
b. False
Indicate whether the statement is true or false

Question 119

The direction of a magnetic field at a point can be determined by a compass.
a. True
b. False
Indicate whether the statement is true or false

Question 120

The deviation from the way a compass needle points from the true north direction is the magnetic declination.
a. True
b. False
Indicate whether the statement is true or false

Question 121

The light bulb used in a lamp has a resistance of 240 ohms when operating on 120 volts. What is the bulb's power consumption?

johnpizzaz · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

electromagnetic induction.

Answer to Question 2

microwave

Answer to Question 3

high

Answer to Question 4

infrared

Answer to Question 5

the Meissner effect

Answer to Question 6

electromagnetic induction

Answer to Question 7

electromagnetic induction

Answer to Question 8

300 m

Answer to Question 9

frequencies (or wavelengths)

Answer to Question 10

X rays

Answer to Question 11

ionosphere

Answer to Question 12

infrared

Answer to Question 13

ultraviolet

Answer to Question 14

Ultraviolet

Answer to Question 15

gamma radiation

Answer to Question 16

microwave

Answer to Question 17

hotter

Answer to Question 18

temperature

Answer to Question 19

Blackbody

Answer to Question 20

infrared

Answer to Question 21

global warming or the greenhouse effect

Answer to Question 22

infrared

Answer to Question 23

ultraviolet

Answer to Question 24

low

Answer to Question 25

generators, transformers, dynamic microphones, regenerative brakes

Answer to Question 26

a compass

Answer to Question 27

a, b, d

Answer to Question 28

a, d

Answer to Question 29

a, b

Answer to Question 30

a, d

Answer to Question 31

b, c, d

Answer to Question 32

c, d

Answer to Question 33

b

Answer to Question 34

b

Answer to Question 35

b

Answer to Question 36

b

Answer to Question 37

a

Answer to Question 38

a

Answer to Question 39

d

Answer to Question 40

b

Answer to Question 41

b

Answer to Question 42

d

Answer to Question 43

a

Answer to Question 44

d

Answer to Question 45

b

Answer to Question 46

b

Answer to Question 47

d

Answer to Question 48

e

Answer to Question 49

b

Answer to Question 50

b

Answer to Question 51

e

Answer to Question 52

b

Answer to Question 53

a

Answer to Question 54

c

Answer to Question 55

e

Answer to Question 56

b

Answer to Question 57

a

Answer to Question 58

c

Answer to Question 59

b

Answer to Question 60

c

Answer to Question 61

a

Answer to Question 62

e

Answer to Question 63

c

Answer to Question 64

b

Answer to Question 65

a

Answer to Question 66

d

Answer to Question 67

d

Answer to Question 68

e

Answer to Question 69

d

Answer to Question 70

e

Answer to Question 71

b

Answer to Question 72

d

Answer to Question 73

a

Answer to Question 74

b

Answer to Question 75

d

Answer to Question 76

e

Answer to Question 77

c

Answer to Question 78

e

Answer to Question 79

b

Answer to Question 80

c

Answer to Question 81

c

Answer to Question 82

b

Answer to Question 83

c

Answer to Question 84

FALSE

Answer to Question 85

TRUE

Answer to Question 86

FALSE

Answer to Question 87

FALSE

Answer to Question 88

TRUE

Answer to Question 89

FALSE

Answer to Question 90

TRUE

Answer to Question 91

TRUE

Answer to Question 92

TRUE

Answer to Question 93

TRUE

Answer to Question 94

FALSE

Answer to Question 95

TRUE

Answer to Question 96

FALSE

Answer to Question 97

FALSE

Answer to Question 98

FALSE

Answer to Question 99

FALSE

Answer to Question 100

TRUE

Answer to Question 101

TRUE

Answer to Question 102

FALSE

Answer to Question 103

TRUE

Answer to Question 104

FALSE

Answer to Question 105

TRUE

Answer to Question 106

TRUE

Answer to Question 107

FALSE

Answer to Question 108

FALSE

Answer to Question 109

FALSE

Answer to Question 110

TRUE

Answer to Question 111

TRUE

Answer to Question 112

TRUE

Answer to Question 113

TRUE

Answer to Question 114

TRUE

Answer to Question 115

FALSE

Answer to Question 116

TRUE

Answer to Question 117

FALSE

Answer to Question 118

FALSE

Answer to Question 119

TRUE

Answer to Question 120

TRUE

Answer to Question 121

60 W