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Sound Insulation MCQ

What is the law in which sound levels falls inversely proportional to the square of the distance from the source?

Second Inverse Square Law

Inverse Square Law

Third Inverse Square Law

First Inverse Square Law

Answer

Correct Answer: Inverse Square Law

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What does the term "inverse square law" mean in acoustics?

The sound level falls inversely proportional to the distance from the source.

The sound level falls inversely proportional to the square of the distance from the source.

The sound level falls inversely proportional to the cube of the distance from the source.

The sound level falls inversely proportional to the square root of the distance from the source.

Answer

Correct Answer: The sound level falls inversely proportional to the square of the distance from the source.

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What is the purpose of soundproofing?

To make structures vibrate more

To make structures echo more

To make structures absorb more sound

To make structures more impervious to sound transmission

Answer

Correct Answer: To make structures more impervious to sound transmission

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What is SPL?

Sound Pressure Limited

SOUND PRESSURE LEVEL

Standard Pressure Level

Sound Power Level

Answer

Correct Answer: SOUND PRESSURE LEVEL

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What is the unit of measurement for SPL?

Pascals (Pa)

Decibels (dB)

Meters (m)

Feet (ft)

Answer

Correct Answer: Decibels (dB)

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SOUND PRESSURE is the difference between the _____ of a sound wave and the static atmospheric pressure.

Frequency

Amplitude

Instantaneous pressure

Wavelength

Answer

Correct Answer: Instantaneous pressure

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What is a sound level meter used for?

To measure the temperature of a room

To measure the weight of objects

To measure sound levels or noises at different frequencies.

To create sound effects

Answer

Correct Answer: To measure sound levels or noises at different frequencies.

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What is a subjective measure of sound called?

Tone

Sound Level

Pitch

Loudness

Answer

Correct Answer: Sound Level

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What is a sound barrier?

A loud noise

Any material or structure that impedes the transmission of noise beyond it

A soundproof room

A machine that amplifies sound

Answer

Correct Answer: Any material or structure that impedes the transmission of noise beyond it

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What is the Sound Absorption Coefficient?

The year when women began to appear in ballet performances.

The amount of sound energy striking a given material.

The amount of sound energy reflected by a given material.

The amount of sound energy absorbed by a given material.

Answer

Correct Answer: The amount of sound energy absorbed by a given material.

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What is the definition of sound absorption?

The property of materials such as air, walls or acoustic panels that changes sound wave energy into electrical energy.

The property of materials such as air, walls or acoustic panels that changes sound wave energy into heat energy.

The property of materials such as air, walls or acoustic panels that changes sound wave energy into mechanical energy.

The property of materials such as air, walls or acoustic panels that changes sound wave energy into chemical energy.

Answer

Correct Answer: The property of materials such as air, walls or acoustic panels that changes sound wave energy into heat energy.

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What is the property of materials that changes sound wave energy into heat energy?

Sound reflection

Sound diffraction

Sound absorption

Sound transmission

Answer

Correct Answer: Sound absorption

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What is the average speed of sound at sea level and 20ºC?

861 mph

761 mph

343 m/s

661 mph

Answer

Correct Answer: 343 m/s

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What does SINE WAVE stand for?

Sound Image Noise Emission Wave

Sustained Interval Noise Exposure Wave

Short Interval Noise Evaluation Wave

A continuous uniform (sound) wave having a constant amplitude and frequency.

Answer

Correct Answer: A continuous uniform (sound) wave having a constant amplitude and frequency.

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What does a higher signal to noise ratio mean?

The lower the background or unwanted noise interferes with the desired signal.

The level of desired signal is higher than the level of background or unwanted noise.

The higher the background or unwanted noise interferes with the desired signal.

The level of desired signal is lower than the level of background or unwanted noise.

Answer

Correct Answer: The lower the background or unwanted noise interferes with the desired signal.

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What is a Septum?

The seventh month of the year

A type of birth control

A wall that partitions two areas

A thin layer of material that helps prevent sound waves from passing through an absorptive material.

Answer

Correct Answer: A thin layer of material that helps prevent sound waves from passing through an absorptive material.

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What is the value of 1 metric Sabin?

1/2 square meter of 100% absorbing material

1 square meter of 100% absorbing material

2 square meters of 100% absorbing material

1 square meter of 50% absorbing material

Answer

Correct Answer: 1 square meter of 100% absorbing material

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What does SABIN stand for?

Wallace Clement Sabine

Sound Amplification of a room or acoustic material

Sound Absorption of a room or acoustic material

100% absorbing material

Answer

Correct Answer: Sound Absorption of a room or acoustic material

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REVERBERATION TIME is commonly referred to as what?

RWT60

RNT60

RET60

RT60

Answer

Correct Answer: RT60

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What is the name for the continuation of sound wave energy in an enclosed space after the original sound source has stopped?

Echo

Timbre

Reflection

Reverberation

Answer

Correct Answer: Reverberation

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What is the definition of reverberation?

The sound that is created when an object vibrates.

The sound that is created when two mediums collide.

The perpetuation of sound wave energy in an enclosed space after the original sound source has stopped.

The sound that is created when a person talks.

Answer

Correct Answer: The perpetuation of sound wave energy in an enclosed space after the original sound source has stopped.

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What is the definition of a resonant frequency?

A frequency at which a resonance exists.

The natural frequency of an object

A loud, high-pitched noise

The speed of sound

Answer

Correct Answer: A frequency at which a resonance exists.

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What is a frequency at which a resonance exists called?

RESONANT FREQUENCY

STATIC FORCE

FRICTION FORCE

DYNAMIC FORCE

Answer

Correct Answer: RESONANT FREQUENCY

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What is the frequency at which the entire partition or wall assembly resonates?

The frequency at which the entire partition or wall assembly resonates is dependent on the size of the hole

This frequency is dependent on cavity depth, insulation, mass, etc.

The frequency at which the entire partition or wall assembly resonates is dependent on the type of material

The frequency at which the entire partition or wall assembly resonates is dependent on the thickness of the wall

Answer

Correct Answer: This frequency is dependent on cavity depth, insulation, mass, etc.

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What is the natural frequency of vibration of an object called?

Resonance frequency

Amplitude

Wavelength

Intensity

Answer

Correct Answer: Resonance frequency

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What is the definition of resonance?

The reinforcement of a partition vibrating at resonance.

The combination of mass and stiffness.

The amplification of an airborne frequency.

The natural frequency of vibration of an object.

Answer

Correct Answer: The reinforcement of a partition vibrating at resonance.

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What is sound reflection?

Sound wave energy that strikes and bounces off a surface through which it cannot pass.

The speed of sound through different mediums

Sound that is produced when two objects collide

The loudness of a sound

Answer

Correct Answer: Sound wave energy that strikes and bounces off a surface through which it cannot pass.

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What is the term for sound wave energy that strikes and bounces off a surface through which it cannot pass?

Transmission

Reflection

Refraction

Diffraction

Answer

Correct Answer: Reflection

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What is an open plenum used for in buildings?

Electrical and HVAC purposes

As a flanking path for sound transmission

For human occupancy

To store building materials

Answer

Correct Answer: Electrical and HVAC purposes

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What is the unit for sound frequency?

Hertz

Octaves

Picos

Answer

Correct Answer: DB

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What is 1 Phon equal to at a frequency of 1000 Hz?

2 dBSPL

1 dBSPL

5 dBSPL

3 dBSPL

Answer

Correct Answer: 1 dBSPL

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What is the unit measurement of perceived sound or loudness?

Doppler

Phon

Model

Bell

Answer

Correct Answer: Phon

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What is the range for OITC?

20 Hz to 1000 Hz

80 Hz to 4000 Hz

60 Hz to 2000 Hz

30 Hz to 3000 Hz

Answer

Correct Answer: 80 Hz to 4000 Hz

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What does OITC stand for?

Ordinary Indoor Transmission Class

Optimal Indoor Transmission Class

Outside Indoor Transmission Class

Outdoor Indoor Transmission Class

Answer

Correct Answer: Outdoor Indoor Transmission Class

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What does 1/3 OCTAVE BANDS mean?

The most important Octave Band

Each of the Octave Bands are split into two

Each of the Octave Bands are split into three

Octave Bands are played together

Answer

Correct Answer: Each of the Octave Bands are split into three

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What is the interval between two discrete frequencies called?

Octave

Sextet

Octet

Interval

Answer

Correct Answer: Octave

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What does an NRC of 1 indicate?

Imperfect absorption

Perfect absorption

Imperfect reflection

Perfect reflection

Answer

Correct Answer: Perfect absorption

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NR is used to determine the reduction of SPL caused by what?

A room

An absorbent material

A sound source

Decibels

Answer

Correct Answer: An absorbent material

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What does NIC stand for?

Noise in Construction

No Intermediate Class

National Insurance Corporation

Noise Isolation Class

Answer

Correct Answer: Noise Isolation Class

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What does NC stand for in Noise Criteria?

Noise Criteria

Noisy Crocodiles

National Cheesecake

Noise Cancellation

Answer

Correct Answer: Noise Criteria

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What is the definition of noise?

A sound that does not cause interference

A musical sound

A loud and unpleasant sound

Any sound in the acoustic domain both wanted and unwanted

Answer

Correct Answer: Any sound in the acoustic domain both wanted and unwanted

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What is noise described as in the acoustic domain?

Any sound in the acoustic domain, both wanted and unwanted.

Any sound that is Excessively Loud

Any sound that is Unwanted

Any sound that is Wanted

Answer

Correct Answer: Any sound in the acoustic domain, both wanted and unwanted.

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If you were to double the mass of an existing wall, the TL would improve by:

+12dB

-3dB

+6dB

+9dB

Answer

Correct Answer: +6dB

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If you were to add an additional sheet of drywall to an existing wall, what would be the effect on the sound transmission loss?

+3dB

+6dB

+12dB

No effect

Answer

Correct Answer: No effect

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For every doubling of mass, there is a _____ improvement of transmission loss.

6dB

12dB

9dB

3dB

Answer

Correct Answer: 6dB

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What is the transmission loss of a material?

The amount of sound that a material can stop

The amount of sound that a material can absorb

The weight of a given material in a given volume

The amount of sound that a material can reflect

Answer

Correct Answer: The amount of sound that a material can stop

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What is the weight of a given material in a given volume?

Density

Mass

Weight

Volume

Answer

Correct Answer: Mass

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What is the most common type of masking?

"Purple noise"

"Brown noise"

"Blue noise"

"White noise" or "pink noise"

Answer

Correct Answer: "White noise" or "pink noise"

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What is the most common type of noise masking?

"Pink noise"

"Green noise"

"Yellow noise"

"White noise"

Answer

Correct Answer: "White noise"

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What is the unit of measurement for loudness?

M/s

Answer

Correct Answer: DB

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What is loudness dependent on?

Intensity

Duration

Softness

Sound pressure, intensity, and frequency

Answer

Correct Answer: Sound pressure, intensity, and frequency

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What is the purpose of having a LIVE END / DEAD END in a performance space?

The LIVE END / DEAD END prevents sound from traveling to the wrong places.

The LIVE END / DEAD END allows the performer to hear themselves better.

The LIVE END / DEAD END creates a more reverberant sound.

The DEAD END allows the performer to hear the purest sound produced.

Answer

Correct Answer: The DEAD END allows the performer to hear the purest sound produced.

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What is the DEAD END in an acoustical treatment plan?

The front row of seats

The back row of seats

The stage

The balcony

Answer

Correct Answer: The stage

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What is an example of an impact sound?

Animal cries

Laughter

Footsteps

Sirens

Answer

Correct Answer: Footsteps

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What is the definition of "IMPACT SOUND"?

Sound that is used to communicate

Sound that is artificially produced

Sound that is generated by a machine

Sound generated by the collision of two solid objects and carried through a structure.

Answer

Correct Answer: Sound generated by the collision of two solid objects and carried through a structure.

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What is the unit of frequency?

Seconds

Hertz

McCarthy

Minutes

Answer

Correct Answer: Hertz

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How high can the highest frequency an average middle aged person hear be?

12,000-14,000 Hz

15,000-17,000 Hz

18,000-20,000 Hz

21,000-23,000 Hz

Answer

Correct Answer: 12,000-14,000 Hz

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What is the hearing range for human speech?

600 Hz to 4800 Hz

12,000-14,000 Hz

4800 Hz to 12,000 Hz

16-20 Hz to 20,000 Hz

Answer

Correct Answer: 600 Hz to 4800 Hz

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What is hearing impairment?

Any degree, full or partial, of impairment of the ability to apprehend sound.

The ability to feel

The ability to smell

The ability to see

Answer

Correct Answer: Any degree, full or partial, of impairment of the ability to apprehend sound.

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Environments with what make it harder for those with hearing loss to understand conversation?

Higher noise levels

Shorter reverberation times

Longer reverberation times

Lower noise levels

Answer

Correct Answer: Longer reverberation times

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What is a sound composed of?

A sound is composed of multiple frequencies.

A sound is composed of lower frequency pitches.

A sound is composed of higher frequency pitches.

A sound is composed of a single frequency.

Answer

Correct Answer: A sound is composed of multiple frequencies.

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What is the main purpose of frequency analysis?

To determine the overall volume of a sound.

To determine the volume of sounds at various frequencies that make up the overall sound’s spectrum.

To determine the single pure frequency of a sound.

To determine the pitch of a sound.

Answer

Correct Answer: To determine the volume of sounds at various frequencies that make up the overall sound’s spectrum.

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What is the unit used to measure acoustic frequency?

Hertz

Cycles/second

Minutes

Seconds

Answer

Correct Answer: Hertz

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What is the SI unit of frequency?

Decibels (dB)

Hertz (Hz)

Meter (m)

Seconds (s)

Answer

Correct Answer: Hertz (Hz)

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What is meant by a "free field?"

A sound environment that is free from all bounding surfaces or obstructions.

A sound environment that has no noise

A sound environment that is small

A sound environment that has no reflections

Answer

Correct Answer: A sound environment that is free from all bounding surfaces or obstructions.

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What is the full form of STC?

Static Transmission Class

Sound Transmission Class

Standard Temperature & Pressure Conditions

Sound Transmission Capacity

Answer

Correct Answer: Sound Transmission Class

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Flanking noise is caused by _____________

Indirect path of sound transmission traveling around a partition or barrier

Sound waves bouncing off of walls

Noise under doors

Direct path of sound transmission

Answer

Correct Answer: Indirect path of sound transmission traveling around a partition or barrier

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What is the measure of sound pressure over the frequency spectrum represented by curves on a graph called?

Volume of Noise

Sensitivity of Hearing

Pitch of Frequency

Equal Loudness Contours

Answer

Correct Answer: Equal Loudness Contours

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How can echo flutters be controlled?

With diffusers and sound absorbing products.

By adding more reverb

By amplifying the sound

By bouncing the sound off a hard surface

Answer

Correct Answer: With diffusers and sound absorbing products.

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What is the minimum delay required for an echo to be heard?

.1 sec

.01 sec

1 sec

.001 sec

Answer

Correct Answer: .01 sec

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What is the definition of diffusion?

The scattering or random reflection of a sound wave from a surface.

The direction of a sound wave from a surface.

The amplification of a sound wave from a surface.

The reflection of a sound wave from a surface.

Answer

Correct Answer: The scattering or random reflection of a sound wave from a surface.

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What is the definition of a "deflection"?

The process of altering the course of something

The distance an elastic body or spring moves when subjected to a static or dynamic force

The act of deterring something

The amount of force required to cause an object to move

Answer

Correct Answer: The distance an elastic body or spring moves when subjected to a static or dynamic force

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What is the threshold of pain for the human ear in decibels?

100 dB

120 dB

110 dB

130 dB

Answer

Correct Answer: 120 dB

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What is a decibel?

A logarithmic unit used to express the difference or magnitude of the level or power of sound intensity.

A unit of sound pressure

A unit of sound intensity

A unit of frequency

Answer

Correct Answer: A logarithmic unit used to express the difference or magnitude of the level or power of sound intensity.

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What does DAMPING refer to?

The process by which heat is converted into vibrations over time and distance.

The process by which vibrations are converted into heat over time and distance.

The process by which vibrations are converted into electrical energy over time and distance.

The process by which vibrations are converted into sound over time and distance.

Answer

Correct Answer: The process by which vibrations are converted into heat over time and distance.

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What is the unit of measure for cycles per second?

Minutes

One second

Hertz

Decibels

Answer

Correct Answer: One second

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What is the definition of cycles per second?

The number of beats per minute.

The number of vibrations per second.

The number of oscillations (cycles) that occur in the time frame of one second.

The number of decibels.

Answer

Correct Answer: The number of oscillations (cycles) that occur in the time frame of one second.

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What is the cycle in acoustics?

The number of times a sound wave vibrates per second

The time it takes for a sound wave to travel one meter

The loudness of a sound

The complete oscillation of a sound wave's pressure above and below the atmospheric static pressure

Answer

Correct Answer: The complete oscillation of a sound wave's pressure above and below the atmospheric static pressure

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What is the full oscillation of a sound wave's pressure called?

Wavelength

Cycle

Sine

Amplitude

Answer

Correct Answer: Cycle

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What are the constraining layers in CLD?

Asphalt

Rigid layers like drywall or plywood

Concrete

Soil

Answer

Correct Answer: Rigid layers like drywall or plywood

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What are the two layers found in constrained layer damping?

Viscoelastic damping compound and stiff layers

Vibrational energy and resonance

Convertion of vibration and heat

Drywall and plywood

Answer

Correct Answer: Viscoelastic damping compound and stiff layers

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What is the name for the region where the speed of the wave is equal to the speed of sound in air?

Coincidence Region

Diffraction Region

Right Region

Interference Region

Answer

Correct Answer: Coincidence Region

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What is the cocktail party effect?

The ability to focus one’s listening attention on a single talker among a mixture of conversations and background noises

The ability to focus one’s attention on a single task among a mixture of tasks

The ability to focus one’s auditory attention on a single sound among a mixture of sounds and background noise

The ability to focus one’s visual attention on a single object among a mixture of objects and background clutter

Answer

Correct Answer: The ability to focus one’s listening attention on a single talker among a mixture of conversations and background noises

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What is a cloud?

A large mass of ice and snow

A group of water droplets

A natural phenomenon consisting of vapor, water droplets, ice crystals, or a mixture of these

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

Answer

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

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CLOUD refers to an acoustical panel suspended in a vertical position from a ceiling or roof structure.

True

False

Answer

Correct Answer: False

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What does BOOMINESS refer to?

No frequency reflections

Medium frequency reflections

Low frequency reflections

High frequency reflections

Answer

Correct Answer: Low frequency reflections

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What is the range of frequencies that a bass trap can absorb?

Mid-range frequencies

Sound at low frequencies less that about 100 hertz (Hz)

Low frequencies greater than 100 hertz (Hz)

High frequency sounds

Answer

Correct Answer: Sound at low frequencies less that about 100 hertz (Hz)

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What is the main purpose of a bass trap?

To increase sound at low frequencies

To generate sound

To reflect sound

To absorb sound at low frequencies

Answer

Correct Answer: To absorb sound at low frequencies

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What is the definition of BARRIER?

A place where you can practice your communication skills

An impenetrable wall

A device that helps you hear better

Anything physical or an environment that interferes with communication or listening

Answer

Correct Answer: Anything physical or an environment that interferes with communication or listening

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What does BAFFLE stand for?

A device used to produce light

An acoustical sound absorbing unit.

A device used to measure sound

A device used to clean water

Answer

Correct Answer: An acoustical sound absorbing unit.

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What is the purpose of a baffle?

To absorb sound

To reduce reverberation and noise levels

To increase reverberation and noise levels

To create a more reverberant space

Answer

Correct Answer: To reduce reverberation and noise levels

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What is the sum total of all unwanted residual noise generated from all direct and reflected sound sources in a space called?

Background noise

Speech noise

Sound spectrum

Reverberation

Answer

Correct Answer: Background noise

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What is the main reason for the increase in efficiency of absorption?

Air space

More surface area on an acoustical panel

Diffraction around the panels

Spacing the materials apart

Answer

Correct Answer: More surface area on an acoustical panel

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Why does having acoustical materials spaced apart increase absorption?

Air space

More surface area on an acoustical panel

More surface area on an acoustical panel, diffraction around the panels, and air space

Diffraction around the panels

Answer

Correct Answer: More surface area on an acoustical panel, diffraction around the panels, and air space

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What does the ARTICULATION INDEX measure?

The clarity of the spoken word in a sentence.

The number of words spoken in a sentence.

Intelligibility of the spoken word in a sentence from 0 to 100%.

The length of time it takes to articulate a sentence.

Answer

Correct Answer: Intelligibility of the spoken word in a sentence from 0 to 100%.

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The ARTICULATION INDEX is a measure of which of the following?

Speech intelligibility

Reverberation

Sound clarity

Background noise

Answer

Correct Answer: Speech intelligibility

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What is the difference between AC and NIC?

AC is less effective than NIC

NIC is based on speech privacy while AC is not.

AC is more expensive than NIC

AC values increase with increasing privacy, while NIC is based on hearing sensitivity.

Answer

Correct Answer: AC values increase with increasing privacy, while NIC is based on hearing sensitivity.

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What does AC stand for?

Acoustical screens

Articulation Class

Acoustical Ceilings

Acoustical Class

Answer

Correct Answer: Articulation Class

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What is the main purpose of Architectural Acoustics?

To assess the effect of the building on its occupants

To support the communications function within the space

To determine the character of the building materials used

The control of noise in a building space

Answer

Correct Answer: The control of noise in a building space

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AMPLITUDE is the nonnegative scaler measurement of what during a frequency cycle?

The average magnitude

The minimum magnitude

A sound wave's peak magnitude

The maximum magnitude

Answer

Correct Answer: A sound wave's peak magnitude

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What is the AMPLITUDE?

The positive scaler measurement of a sound wave’s trough magnitude during a frequency cycle.

The scaler measurement of a sound wave’s frequency during a pressure cycle.

The nonnegative scaler measurement of a sound wave’s peak magnitude during a frequency cycle or peak pressure variation.

The scaler measurement of a sound wave’s average magnitude during a frequency cycle.

Answer

Correct Answer: The nonnegative scaler measurement of a sound wave’s peak magnitude during a frequency cycle or peak pressure variation.

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What are the two main types of noise?

Transcriptional noise

Environmental noise

Traffic and HVAC

Genetic noise

Answer

Correct Answer: Traffic and HVAC

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What is AIRBORNE SOUND?

Sound that reaches the point of interest by traveling through the ground.

Sound that is generated at the point of interest.

Sound that reaches the point of interest by traveling through the water.

Sound that reaches the point of interest by traveling through the air.

Answer

Correct Answer: Sound that reaches the point of interest by traveling through the air.

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What does the acoustical environment refer to?

The study of hearing

The acoustical characteristics of a space or room

The study of music

The study of sound

Answer

Correct Answer: The acoustical characteristics of a space or room

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What is an Acoustical Consultant?

A medical doctor who specializes in the study of the ear and its disorders

Someone who analyses and rates the quality of sounds

A professional who is experienced in providing advice on acoustical requirements, and noise control in a variety of situations.

A professional who designs and installs sound systems.

Answer

Correct Answer: A professional who is experienced in providing advice on acoustical requirements, and noise control in a variety of situations.

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What is the purpose of an acoustical analysis?

To determine the level of acoustical absorption in a space

To determine the level of reverberation or reflected sound in a space

To determine the level of noise in a space

To determine the level of light in a space

Answer

Correct Answer: To determine the level of reverberation or reflected sound in a space

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What does the adjective form of acoustical mean?

The science of hearing

The study of sound

The study of the physics of sound

The properties of a material to absorb or reflect sound

Answer

Correct Answer: The properties of a material to absorb or reflect sound

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What does the word "acoustical" mean?

The properties of a material to absorb or reflect sound (adjective)

The study of sound

Of or relating to the ear

A device used to amplify sound

Answer

Correct Answer: The properties of a material to absorb or reflect sound (adjective)

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What does the study of acoustics involve?

The scientific study of sound, its production, transmission, and effects.

The study of sonic booms

The study of animals that produce sound

The study of hearing

Answer

Correct Answer: The scientific study of sound, its production, transmission, and effects.

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What is the scientific study of sound called?

Acoustics

Sociology

Geology

Biology

Answer

Correct Answer: Acoustics

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More Acoustical Engineering Subjects

Architectural Acoustics

Noise & Vibration Control

Environmental Acoustics

Measurement of Noise

Ear Anatomy

Basic Audiology

Microphones

Acoustic modelling software

Acoustics Design Practicum

Acoustical Modeling

Noise Control

Audio Visual System Design

Acoustical and Audio Measurements

Electroacoustics

Psychoacoustics

Musical Acoustics

More Resources

Acoustical Engineering Skill Assessment

Acoustical Engineering PDF

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