Neets Mod 10

Front 1

what is the major advantage of the telegraph over earlier methods of communication?
1. range
2. speed
3. security
4. reliability

Back 1

2. speed

Front 2

the spreading out of radio waves is referred to as propagation and is used in which of the following navy equipment?
1. detection
2. communication
3. radar and navigation
4. each of the above

Back 2

4. each of the above

Front 3

radio-frequency waves CANNOT be seen for which of the following reasons?
1. because radio-frequency energy is low powered
2. because radio-frequency waves are below the sensitivity range of the human eye
3. because the human eye detects only magnetic energy
4. because radio-frequency waves are above the sensitivity range of the human eye

Back 3

2. because radio-frequency waves are below the sensitivity range of the human eye

Front 4

radio waves travel at what speed?
1. speed of sound
2. speed of light
3. speed of the earth's rotation
4. speed of the earth's orbit around the sun

Back 4

2. speed of light

Front 5

which of the following types of energy CANNOT be seen, heard, or felt?
1. radio waves
2. sound waves
3. heat waves
4. light waves

Back 5

1. radio waves

Front 6

a stone dropped into water creates a series of expanding circles on the surface of the water. this is an example of which of the following types of wave motion?
1. tansverse
2. concentric
3. longitudinal
4. compression

Back 6

1. transverse

Front 7

a sound wave that moves back and forth in the direction of propagation is an example of which of the following types of wave motion?
1. composite
2. concentric
3. transverse
4. longitudinal

Back 7

4. longitudinal

Front 8

which of the following terms is used for the vehicle through which a wave travels from point to point?
1. medium
2. source
3. detector
4. receiver

Back 8

1. medium

Front 9

which of the following is NOT an element necessary to propagate sound?
1. medium
2. source
3. detector
4. reference

Back 9

4. reference

Front 10

if a wave has a velocity of 4,800 feet per second and a wave-length of 5 feet, what is the frequency of the wave?
1. 9.6 Hz
2. 96 Hz
3. 960 Hz
4. 9,600 Hz

Back 10

3. 960 Hz

Front 11

which of the following statements about a wave is the law of reflection?
1. the angle of incidence is equal to the refracted wave
2. the angle of incidence is not equal to the refracted wave
3. the angle of incidence is not equal to the angle of reflection
4. the angle of incidence is not equal to the angle of reflection

Back 11

1. the angle of incidence is equal to the refracted wave

Front 12

the reception of an AM-band radio signal over mountains can be explained by which of the following principle of wave propagation?
1. reflection
2. refraction
3. diffraction
4. doppler effect

Back 12

3. diffraction

Front 13

what wave propagation principle accounts for the apparent increase in frequency as a train whistle approaches and the apparent decrease in frequency as it moves away?
1. refraction
2. reflection
3. diffraction
4. doppler effect

Back 13

4. doppler effect

Front 14

what are the three audible frequency ranges?
1. subsonic, sonic, and supersonic
2. infrasonic, sonic, and ultrasonic
3. infrasonic, subsonic, and ultrasonic
4. infrasonic, subsonic, and supersonic

Back 14

2. infrasonic, sonic, and ultrasonic

Front 15

varying which of the following wave characteristics will cause the length of sound waves to vary?
1. phase
2. quality
3. amplitude
4. frequency

Back 15

4. frequency

Front 16

what are the three basic characteristics of sound?
1. amplitude, intensity, and quality
2. pitch, intensity, and tone
3. pitch, intensity, and quality
4. pitch, frequency, and quality

Back 16

3. pitch, intensity, and quality

Front 17

if several musical instruments are playing the same note, you should be able to distinguish one instrument from another because of which of the following characteristics of sound?
1. quality
2. overtones
3. frequency
4. intensity

Back 17

1. quality

Front 18

through which of the following mediums will sound travel fastest, at the indicated temperature?
1. air at 68 F
2. lead at 20 C
3. steel at 32 F
4. steel at 20 C

Back 18

4. steel at 20 C

Front 19

in sound terminology, which of the following terms is the same as a wave reflection?
1. echo
2. image
3. acoustics
4. refraction

Back 19

1. echo

Front 20

multiple reflections of sound waves are referred to as
1. noise
2. acoustics
3. interference
4. reverberation

Back 20

4. reverberation

Front 21

a cavity that vibrates at its own natural frequency and produces a sound that is louder than at other frequencies is demonstrating which of the following sound characteristics?
1. noise
2. quality
3. resonance
4. reverberation

Back 21

3. resonance

Front 22

energy in the form of light can be produced through which of the following means?
1. chemical
2. electrical
3. mechanical
4. each of the above

Back 22

4. each of the above

Front 23

the scientist, J.C. Maxwell, developed the theory that small packets of electromagnetic energy called photons produce
1. sound
2. noise
3. echoes
4. light

Back 23

4. light

Front 24

what causes sunlight to separate into different wavelengths and display a rainbow of colors when passed through a prism?
1. refraction
2. reflection
3. dispersion
4. diffraction

Back 24

3. dispersion

Front 25

the sun, gas flames, and electric light filaments are visible because they are
1. opaque
2. transparent
3. nonluminous
4. self-luminous

Back 25

4. self-luminous

Front 26

substances that transmit almost all of the light waves falling upon them possess which of the following properties?
1. opaqueness
2. transparence
3. translucence
4. self-lumination

Back 26

2. transparence

Front 27

some substances are able to transmit light waves but objects cannot be seen through them. which of the following properties does this statement describe?
1. opaqueness
2. transparence
3. translucence
4. self-lumination

Back 27

2. transparence

Front 28

the speed of light depends on the medium through which light travels. for which of the following reasons does light travel through empty space faster than through an object such as glass?
1. space is less dense than glass
2. space is more dense than glass
3. glass reflects the light back to the source
4. glass refracts the light, causing the light to travel in all directions

Back 28

1. space is less dense than glass

Front 29

if a light wave strikes a sheet of glass at a perpendicular angle, what is the effect, if any, on the light wave?
1. the wave is completely absorbed
2. the wave is reflected back toward the source
3. the wave is refracted as it passes through the glass
4. the wave is unchanged and continues in a straight line

Back 29

4. the wave is unchanged and continues in a straight line

Front 30

which of the following waves are NOT a form of electromagnetic energy?
1. heat waves
2. sound waves
3. light waves
4. radio waves

Back 30

2. sound waves

Front 31

the electromagnetic spectrum represents the entire range of electromagnetic waves arranged in the order of their
1. color
2. frequency
3. visibility
4. application

Back 31

2. frequency

Front 32

which of the following portions of the frequency spectrum contains the highest frequency?
1. x-ray
2. radar
3. light
4. cosmic

Back 32

4. cosmic

Front 33

which of the following electronic devices is used to radiate an/or collect electromagnetic waves?
1. antenna
2. receiver
3. transmitter
4. transmission line

Back 33

1. antenna

Front 34

the electric field and magnetic field combine to form which of the following types of waves?
1. spherical
2. elliptical
3. electromagnetic
4. each of the above

Back 34

3. electromagnetic

Front 35

the magnetic field radiated from an antenna is produced by what electrical property?
1. voltage
2. current
3. reactance
4. resistance

Back 35

2. current

Front 36

the electric field radiated from an antenna is produced by what electrical property?
1. voltage
2. current
3. reactance
4. resistance

Back 36

1. voltage