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Acoustical and Audio Measurements MCQ

What is a force that oscillates about some specified reference point called?

Referencing

Vibration

Magnitutde

Oscillation

Answer

Correct Answer: Vibration

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What does "Up front" refer to?

A sound that is soft

A sound made by an animal

A sound notable for its prominence among other sounds.

A sound made by a person

Answer

Correct Answer: A sound notable for its prominence among other sounds.

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What is the definition of "tight"?

A sound that is not loud.

A sound that is difficult to identify.

A sound with excessive reverberation and out of phase reflections.

A well defined sound notable for its clarity and distinction.

Answer

Correct Answer: A well defined sound notable for its clarity and distinction.

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What does the term "tight" usually refer to?

A sound that is muffled

The absence of excessive reverberation and out of phase reflections

A sound that is not well defined

A sound that is difficult to produce

Answer

Correct Answer: The absence of excessive reverberation and out of phase reflections

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At what sound pressure level does a pure tone cause a sensation of pain in the ear?

130 dB SPL

140 dB SPL

150 dB SPL

160 dB SPL

Answer

Correct Answer: 140 dB SPL

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At what decibel level does a sound become painful to the ear?

120

150

130

140

Answer

Correct Answer: 140

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What is the minimum sound pressure level of a pure tone that can be perceived by a person with good hearing?

0 dB SPL

1 dB SPL

2 dB SPL

3 dB SPL

Answer

Correct Answer: 0 dB SPL

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What is the unit for measuring sound pressure?

Meter

Second

Pascal

Kilogram

Answer

Correct Answer: Pascal

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What is the meaning of "Tegular"?

A large, four-legged mammal

A planet in our solar system

Surgical procedure

Edge detail on ceiling panels allowing a panel to hang flush or partially below a suspension grid.

Answer

Correct Answer: Edge detail on ceiling panels allowing a panel to hang flush or partially below a suspension grid.

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What is the "T" in T-Bar stand for?

Top

T-Bar is a metal member of the "T" cross section used in ceiling suspension systems.

Time

Tee

Answer

Correct Answer: T-Bar is a metal member of the "T" cross section used in ceiling suspension systems.

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What is a T-Bar?

A device used to measure the thickness of an object.

Any metal member of the "I" cross section used in ceiling suspension systems.

A cross section of a ceiling used in suspension systems.

Any metal member of the "T" cross section used in ceiling suspension systems.

Answer

Correct Answer: Any metal member of the "T" cross section used in ceiling suspension systems.

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Which of the following is NOT an example of shifting center?

Apparent shift of the position of an instrument

Apparent shift in the stereo image

Shift of an instrument or voice in the stereo image

Due to a discrepancy in the phase relationships of the signals from either side

Answer

Correct Answer: Due to a discrepancy in the phase relationships of the signals from either side

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What is the difference between nominal or maximum operating level and the noise floor expressed in dB?

Noise floor

Signal-to-noise ratio

Nominal level

Maximum operating level

Answer

Correct Answer: Signal-to-noise ratio

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What is a septum?

A thin layer of material that prevents sound waves from passing through absorptive material

A sound wave

An opening in the body

The study of sound

Answer

Correct Answer: A thin layer of material that prevents sound waves from passing through absorptive material

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What is scrim?

A type of coarse, sturdy cloth

A theatrical device consisting of a large cloth that can be lowered or raised to create breaks in the action

A supporting member in a structure

A sheer, loosely woven fabric used as "backing" for acoustical panels.

Answer

Correct Answer: A sheer, loosely woven fabric used as "backing" for acoustical panels.

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What is a sabin?

A device used to measure sound

A measure of sound absorption of a surface

A unit of measurement

A material used for soundproofing

Answer

Correct Answer: A measure of sound absorption of a surface

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What determines a room's reverberation time and acoustical character?

The sum total of all reflected sound waves

The size of the room

The sound waves that are not absorbed

The type of flooring in the room

Answer

Correct Answer: The sum total of all reflected sound waves

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What does the term 'reverberation time' refer to?

The speed of sound

The pitch of sound

The loudness of sound

The sum total of all reflected waves

Answer

Correct Answer: The sum total of all reflected waves

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What is a reactive silencer?

A device that reflects sound waves

A device that amplifies sound

A device that absorbs sound waves

A silencer in air-conditioning systems that uses reflection effects for its action

Answer

Correct Answer: A silencer in air-conditioning systems that uses reflection effects for its action

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What is a reactive absorber?

A device that produces sound waves

A sound absorber which involves the effects of mass and compliance as well as resistance.

A device that absorbs sound waves

A device that reflects sound waves

Answer

Correct Answer: A sound absorber which involves the effects of mass and compliance as well as resistance.

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What does a reactive absorber involve?

The physical act of absorbing sound.

The effects of mass and compliance as well as resistance.

The creation of sound.

The prevention of sound from echoing.

Answer

Correct Answer: The effects of mass and compliance as well as resistance.

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What is the opposite of rarefaction?

Sound wave

Expansion

Rarefaction

Compression

Answer

Correct Answer: Compression

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What is random noise?

Noise generated by a random process

Noise generated by randomising a signal

Noise whose instantaneous amplitude is not specified at any instant of time.

Noise with a Gaussian probability density function

Answer

Correct Answer: Noise whose instantaneous amplitude is not specified at any instant of time.

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What is the result of phase interference?

Making the waveforms in phase with each other

Causing peaks and dips in the overall response curve

Destroying the waveforms

Increasing the amplitude of the waveforms

Answer

Correct Answer: Causing peaks and dips in the overall response curve

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What is the time relationship between two signals called?

Phase

Function

Form

Frequency

Answer

Correct Answer: Phase

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What is the SI unit of frequency?

Hertz

Minutes

Seconds

Metres

Answer

Correct Answer: Hertz

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What is the formula for period?

F = 1/t

T = 1/f

Answer

Correct Answer: T = 1/f

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What is Path length difference?

The distance of source energy from emitted energy.

The difference in time of source energy from emitted energy.

The distance of source energy from reflected energy.

The difference in time/distance of source energy from reflected energy.

Answer

Correct Answer: The difference in time/distance of source energy from reflected energy.

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What is the difference in time/distance of source energy from reflected energy called?

Distance

Reflection

Path length difference

Transmission

Answer

Correct Answer: Path length difference

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What is a passive absorber?

A sound absorber that reflects sound waves.

A sound absorber that requires an external power source to function.

A sound absorber that amplifies sound waves.

A sound absorber that dissipates sound energy as heat.

Answer

Correct Answer: A sound absorber that dissipates sound energy as heat.

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What does "out of phase" mean?

Two related signals offset in time.

Cancelled out

In phase

Unrelated signals

Answer

Correct Answer: Two related signals offset in time.

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What is the width of an octave band?

One octave

One fifth of an octave

Two octaves

One third of an octave

Answer

Correct Answer: One octave

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Octave is the musical spacing between a frequency and _____.

Its triple

Its quadruple

Its double

Its octuple

Answer

Correct Answer: Its double

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How many octaves is the audible range?

10 and 1/2

9 1/2

Answer

Correct Answer: 10 and 1/2

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What is the noise isolation class?

NIC

NDC

NIA

NAC

Answer

Correct Answer: NIC

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What does NIC stands for?

Noise isolation class

Noise index class

Not in class

Noise in class

Answer

Correct Answer: Noise isolation class

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What does NC stand for?

Noise Criteria

Natural Calamity

Noise Cancellation

Noisy City

Answer

Correct Answer: Noise Criteria

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What is the definition of noise?

Unwanted sound

Wanted sound

Measurement

3 dB per octave

Answer

Correct Answer: Unwanted sound

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What is a node?

A point or line where maximum air motion takes place

A point or line where no air motion takes place

A point or line where minimal air motion takes place

A point or line where air motion changes direction

Answer

Correct Answer: A point or line where minimal air motion takes place

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Near field is defined as sound that is ____ from a noise source.

Received at equal levels from all directions

Within about two wavelengths

At a very high frequency

More than two wavelengths

Answer

Correct Answer: Within about two wavelengths

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What is the Near Field?

The area in a room which is in the immediate vicinity of the sound source.

The area in a room which is in the immediate vicinity of the listener.

Answer

Correct Answer: The area in a room which is in the immediate vicinity of the sound source.

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What is the primary function of a decoupling?

The elimination of mechanical shorts

The use of flexible metallic conduit

The separation of rigid components

The insertion of a flexible loop between rigid components

Answer

Correct Answer: The elimination of mechanical shorts

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What is another name for a mechanical coupling?

an air duct

a mechanical "short"

A plumbing system

A electrical circuit

Answer

Correct Answer: a mechanical "short"

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What is the prime example of a mechanical coupling?

Air ducts

Electrical conduit

Acoustically isolated room

Plumbing

Answer

Correct Answer: Air ducts

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What is the main purpose of Mass Loaded Vinyl?

To act as a barrier to sound transmission

To absorb sound

To reflect sound

To generate sound

Answer

Correct Answer: To act as a barrier to sound transmission

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What is Mass Loaded Vinyl?

A high density vinyl material that amplifies sound transmission.

A low density vinyl material that acts as a barrier to sound transmission.

A material that does not act as a barrier to sound transmission.

A high density vinyl material that acts as a barrier to sound transmission.

Answer

Correct Answer: A high density vinyl material that acts as a barrier to sound transmission.

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According to the mass law, what is necessary to increase a wall's transmission loss by 6 dB?

Decrease the width of the wall by half.

Double the height of the wall.

Double the thickness (weight) of the wall.

Double the width of the wall.

Answer

Correct Answer: Double the thickness (weight) of the wall.

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What does masking refer to?

A type of African art

A traditional Japanese dance

The process by which one sound is used to obscure the presence of another.

The act of wearing a mask

Answer

Correct Answer: The process by which one sound is used to obscure the presence of another.

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What does "reverberant acoustical condition" mean?

Loud noise

Harsh noise

A room with many reflective surfaces that encourages a lengthy reverberation time.

Quiet noise

Answer

Correct Answer: A room with many reflective surfaces that encourages a lengthy reverberation time.

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What does the word "reverberant" mean in this context?

A soft echo

A loud echo

A clear echo

A long echo

Answer

Correct Answer: A long echo

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What does LEDE stand for?

Light emitting diode

Light emitting diodes

Light emitting dendrite

Live end, dead end

Answer

Correct Answer: Live end, dead end

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What is leakage?

A method of recording sound

Sound from one room that is heard in another

Any unwanted sound picked up by (or "leaking" into) a microphone from another instrument or loudspeaker.

A device used to amplify sound

Answer

Correct Answer: Any unwanted sound picked up by (or "leaking" into) a microphone from another instrument or loudspeaker.

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What does the law of the first wavefront state?

The first wavefront falling on the ear determines the perceived direction of the sound.

The loudness of the sound is determined by the height of the wavefront.

The speed of sound is determined by the wavelength of the incoming wavefront.

The sound is heard from the direction in which the wavefront travels.

Answer

Correct Answer: The first wavefront falling on the ear determines the perceived direction of the sound.

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What is late reflection?

Reflected energy that occurs a greater distance away from the listener than an early reflection.

Reflected energy that occurs a greater distance away from the source than an early reflection.

Reflected energy that occurs at the same time as the direct sound from the source.

Reflected energy that occurs a shorter distance away from the source than an early reflection.

Answer

Correct Answer: Reflected energy that occurs a greater distance away from the source than an early reflection.

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What is the other name for late reflection?

Slap-back or echo

Early reflection

Distance away

Reflected energy

Answer

Correct Answer: Slap-back or echo

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What does a Kerf do?

A Kerf provides a level surface at the joint or seam.

It is an acoustical panel made of wood

It is a type of joint

Answer

Correct Answer: A Kerf provides a level surface at the joint or seam.

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What is kerf?

A way to connect two pieces of wood

A tool for cutting wood

A type of wood joint

A slice cut into the edge of an acoustic panel

Answer

Correct Answer: A slice cut into the edge of an acoustic panel

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What is an impulse?

A device used to measure sound

A type of wave

A very short, transient, acoustical (or electrical) signal.

A unit of measurement of sound

Answer

Correct Answer: A very short, transient, acoustical (or electrical) signal.

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What is an impaling clip?

A device used to produce sound waves

A device used to amplify sound

A mounting fastener that is a metal plate with tines (prongs or spikes) sticking out of it.

A device used to measure the speed of sound

Answer

Correct Answer: A mounting fastener that is a metal plate with tines (prongs or spikes) sticking out of it.

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What is impact noise?

Noise that is loud and sudden

The noise heard as a result of vibrations transferred through the structure of a room.

The noise heard as a result of vibrations transferred through the air.

Noise that is soft and gentle.

Answer

Correct Answer: The noise heard as a result of vibrations transferred through the structure of a room.

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What is the noise heard as a result of vibrations transferred through the structure of a room called?

Impact noise

Impactful noise

Structural noise

Airborne noise

Answer

Correct Answer: Impact noise

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What classifies a structure's ability to isolate impact noise?

Outdoor-Indoor Transmission Class (OITC)

Weighted Sound Reduction Index (Rw)

Sound Transmission Class (STC)

Impact Isolation Class (IIC)

Answer

Correct Answer: Impact Isolation Class (IIC)

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What is the IIC method used for?

To measure impact noise

To create impact noise

To quantify impact noise

Rating the ability of a structure to isolate impact noise

Answer

Correct Answer: Rating the ability of a structure to isolate impact noise

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What is an image shift?

Sound dislocated from its correct position

Image intensified

Image blurred

Image stretched

Answer

Correct Answer: Sound dislocated from its correct position

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What does "Hertz" measure?

The speed of a wave

The measuring unit of frequency or the speed of vibration of a sound wave

The distance between wave crests

The amplitude of a wave

Answer

Correct Answer: The measuring unit of frequency or the speed of vibration of a sound wave

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What does Hz measure?

The speed of vibration of a sound wave

The speed of light

The temperature of a given object

The length of a given object

Answer

Correct Answer: The speed of vibration of a sound wave

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What is a Helmholtz resonator?

An acoustic guitar body

A perforated cover over a cavity

A reactive, tuned, sound absorber

A device that amplifies sound

Answer

Correct Answer: A reactive, tuned, sound absorber

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How long does the Haas effect last for?

20 to 40 msec

30 to 60 msec

40 to 80 msec

10 to 30 msec

Answer

Correct Answer: 20 to 40 msec

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What is the Grazing Effect?

The way in which sound is echoed by the audience

The way in which sound is amplified by the audience

The way in which light is absorbed by the audience

The way in which sound is absorbed by the audience

Answer

Correct Answer: The way in which sound is absorbed by the audience

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What is an acoustical diffraction grating?

A device to produce diffraction of sound

A device to produce diffusion of sound

A device to produce refraction of sound

A device to produce reflection of sound

Answer

Correct Answer: A device to produce diffusion of sound

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What does an acoustical diffraction grating do?

Produce diffusion of sound

Transmit sound

Produce reflection of sound

Absorb sound

Answer

Correct Answer: Produce diffusion of sound

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What is the principle used to achieve diffraction of acoustical waves?

Diffraction

Reflection

Refraction

Grating

Answer

Correct Answer: Grating

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What is the use of a Gobo?

To add echo

Prevent microphone leakage between two instruments

To boost sound

To clean up recordings

Answer

Correct Answer: Prevent microphone leakage between two instruments

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What are the Fletcher-Munson curves?

The range of human hearing in hertz.

The decibel scale for rating the loudness of sounds.

The range of human hearing in decibels.

The equal loudness contours plotted by the researchers Fletcher and Munson.

Answer

Correct Answer: The equal loudness contours plotted by the researchers Fletcher and Munson.

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What does the term "flat" describe in relation to frequency response?

A frequency response with a lot of treble

An even frequency response in which no frequency is accentuated.

A uneven frequency response

A frequency response with a lot of bass

Answer

Correct Answer: An even frequency response in which no frequency is accentuated.

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What is the term used to describe an even frequency response in which no frequency is accentuated?

Diffuse

Flat

Frequency

Rich

Answer

Correct Answer: Flat

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Flanking occurs when a free standing partition size is ____ than the wavelength of sound to be blocked.

Less

None of the above

Greater

Equal

Answer

Correct Answer: Less

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What is the Flame Spread Index of red oak?

100

Answer

Correct Answer: 100

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What is the main difference between near field and far field?

Amount of acoustic energy

Direction of the energy

Linear dimensions of the source

Distance from the source

Answer

Correct Answer: Distance from the source

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Equalization is the adjustment of what?

Volume

Tone

Tempo

Timbre

Answer

Correct Answer: Timbre

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Which of the following is not a simple form of equalization?

Equalizing

Tone controls

Boosting

Attenuating

Answer

Correct Answer: Tone controls

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Which of the following best describes Equal Loudness Contours?

The average of two sound frequencies

A set of curves of equivalent loudness, which model the ear’s frequency response throughout the audible spectrum.

The difference in loudness between two sounds

The loudness of two identical sounds

Answer

Correct Answer: A set of curves of equivalent loudness, which model the ear’s frequency response throughout the audible spectrum.

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What is the definition of an "echo"?

A distinctly discernible reflection, or repetition of a source signal.

Indistinguishable reflections

Densely spaced reflections

Reverberation

Answer

Correct Answer: A distinctly discernible reflection, or repetition of a source signal.

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What is an eased edge?

A method of printing that uses a curved plate to transfer an image to paper.

An Old English verb meaning “to make (something) free from entanglements or difficulties.”

An acoustical panel edge detail also known as a quarter-inch (¼") bevel.

Answer

Correct Answer: An acoustical panel edge detail also known as a quarter-inch (¼") bevel.

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What is the quarter-inch bevel also known as?

Beveled

Chamfered

Eased

Edge-Lit

Answer

Correct Answer: Eased

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What is the term for reflected energy that occurs in close proximity to the source?

Late reflection

Reverberation

Echo

Early reflection

Answer

Correct Answer: Early reflection

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What is the decibel?

The measuring unit of distance

The measuring unit of speed

The measuring unit of sound pressure

The measuring unit of frequency

Answer

Correct Answer: The measuring unit of sound pressure

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What is the measuring unit of sound pressure?

Newton (N)

Pascal (Pa)

Decibel (dB)

Joule (J)

Answer

Correct Answer: Decibel (dB)

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What is the decay time of a room at a specific frequency?

The time necessary for a sound of that frequency to decay 90 dB.

The time necessary for a sound of that frequency to decay 30 dB.

The time necessary for a sound of that frequency to decay 60 dB.

The length of time taken for a signal to drop in strength to its initial value.

Answer

Correct Answer: The time necessary for a sound of that frequency to decay 60 dB.

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What is dead?

The end of life

An acoustical condition in which reverberation is absent

A state of being unconscious

A lack of movement or energy

Answer

Correct Answer: An acoustical condition in which reverberation is absent

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What is the loss of energy in a vibration system called?

Authentication

Diffusion

Refraction

Damping

Answer

Correct Answer: Damping

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What is Damping?

The sudden stop of a vibration system

A measure of the stiffness of a spring

The loss of energy in a vibration system, usually through friction.

The gain of energy in a vibration system

Answer

Correct Answer: The loss of energy in a vibration system, usually through friction.

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What is the "D" in "D-Ring" refer to?

The letter in the alphabet that comes before "E"

The shape of the ring

The first letter in the alphabet

The letter in the alphabet that comes after "C"

Answer

Correct Answer: The shape of the ring

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The Cocktail Party Effect is the ability to focus on one talker among a mixture of crowd conversations and background noise.

False

True

Answer

Correct Answer: True

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The ability to focus on a single talker in a cocktail party is due to the Brain's ____________

Unintelligible evidence

Discrimination of unwanted sound

Inability to focus

Lip reading

Answer

Correct Answer: Discrimination of unwanted sound

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What does a comb filter do to an acoustical signal?

Produces distortion

Equalizes the sound

Makes the signal louder

Clear the noise

Answer

Correct Answer: Produces distortion

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What is the result of combining an acoustical signal with a delayed replica of itself?

Offset in time

Smooth curve

Constructive and destructive interference

Teeth linear frequency scale

Answer

Correct Answer: Constructive and destructive interference

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What is a Ceiling Cloud?

A type of acoustic guitar

A cloud that forms on the ceiling

An acoustical panel suspended in a horizontal position from ceiling or roof structure.

A sound-proofing method for ceilings

Answer

Correct Answer: An acoustical panel suspended in a horizontal position from ceiling or roof structure.

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What is the acronym for Ceiling Attenuation Class?

CLAC

CAC

CSTC

Answer

Correct Answer: CAC

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What is the destructive interference of two or more sound waves called?

Diffraction

Cancellation

Reflection

Addition

Answer

Correct Answer: Cancellation

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What is destructive interference?

The constructive interference of two or more sound waves.

The reinforcement of two or more sound waves.

The attenuation of two or more sound waves.

The destructive interference of two or more sound waves.

Answer

Correct Answer: The destructive interference of two or more sound waves.

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What does the term "boomy" usually refer to?

No frequency energy

High frequency (treble) energy

An excessive amount of low frequency (bass) energy

Moderate frequency energy

Answer

Correct Answer: An excessive amount of low frequency (bass) energy

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What does Block mean?

None of the above.

To create a barrier against sound.

To increase airborne sound transmission.

To reduce airborne sound transmission.

Answer

Correct Answer: To reduce airborne sound transmission.

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What is the main purpose of a bass trap?

To absorb low frequency waves

To cancel low frequency waves

To project low frequency waves

To reflect low frequency waves

Answer

Correct Answer: To absorb low frequency waves

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What is a barrier?

A structure built to keep animals in a particular area

A place where two roads meet

A device used to control water

Heavy, dense and massive material used to block sound.

Answer

Correct Answer: Heavy, dense and massive material used to block sound.

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What is the primary purpose of a baffle?

To reduce reverberation time.

To produce sound waves.

To increase reverberation time.

To absorb sound waves.

Answer

Correct Answer: To reduce reverberation time.

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What does background noise refer to?

The amount of noise that a particular device or system makes

The ambient noise level above which signals must be presented or noise sources measured.

The lowest noise level that can be detected by the human ear

The level of noise that is considered acceptable in a given environment

Answer

Correct Answer: The ambient noise level above which signals must be presented or noise sources measured.

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What is the ambient noise level above which signals must be presented or noise sources measured?

Background noise

Weighting filter

Signal-to-noise ratio

Threshold noise

Answer

Correct Answer: Background noise

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What is the primary reason for spacing acoustical materials apart?

To allow for diffusion of sound energy

To reduce sound energy

To increase the total surface area

To create an area of effect for greater absorption

Answer

Correct Answer: To create an area of effect for greater absorption

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What does diffraction of sound energy around perimeters cause?

Exposed edges

Gaps in acoustical materials

Anechoic wedge

Spaced apart acoustical materials

Answer

Correct Answer: Exposed edges

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What does the word "Anechoic" mean?

"Loud"

"Without echo"

"Soft"

"Echoing"

Answer

Correct Answer: "Without echo"

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What does the word "Analog" mean?

A device used to measure electrical signals

Process of changing sound into digital form

Digital

Analog representations of sound replicate its waveform, while transferring it through different media.

Answer

Correct Answer: Analog representations of sound replicate its waveform, while transferring it through different media.

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What is ambient noise?

All pervasive noise associated with a given environment.

The right kind of noise to fall asleep to

A type of white noise

A measure of the loudness of sounds

Answer

Correct Answer: All pervasive noise associated with a given environment.

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What is Ambience?

The study of ancient languages.

The act of ringing a church bell.

A city in Texas.

The residual "room sound" of a listening environment.

Answer

Correct Answer: The residual "room sound" of a listening environment.

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What is the science of the production, control, transmission, reception and effects of sound and the phenomenon of hearing?

The study of human hearing

Acoustics

The study of music

The study of human speech

Answer

Correct Answer: Acoustics

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What is acoustical tile most absorptive of?

High frequencies

All frequencies

Low frequencies

Medium frequencies

Answer

Correct Answer: High frequencies

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What portion of energy is absorbed when a sound wave strikes a material?

The material the sound wave is hitting

The sound wave itself

The absorption coefficient of the material

The frequency of the sound wave

Answer

Correct Answer: The absorption coefficient of the material

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What is the unit of measurement for sound absorption?

Pascal

Sabin

Hertz

Decibel

Answer

Correct Answer: Sabin

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More Acoustical Engineering Subjects

Architectural Acoustics

Noise & Vibration Control

Sound Insulation

Environmental Acoustics

Measurement of Noise

Ear Anatomy

Basic Audiology

Microphones

Acoustic modelling software

Acoustics Design Practicum

Acoustical Modeling

Noise Control

Audio Visual System Design

Electroacoustics

Psychoacoustics

Musical Acoustics

More Resources

Acoustical Engineering Skill Assessment

Acoustical Engineering PDF

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