Bu - Acoustics (Annayazu)

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Bu - Acoustics (Annayazu) - Quiz

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Questions and Answers
  • 1. 

    Frequency below human hearing (less than 20 Hz)

    • A.

      Ultrasonics

    • B.

      Infrasonics

    • C.

      Microsonic

    • D.

      Macrosonic

    Correct Answer
    B. Infrasonics
    Explanation
    Infrasonics refers to frequencies below the range of human hearing, which is typically less than 20 Hz. Ultrasonics, on the other hand, refers to frequencies above the range of human hearing. Microsonic and macrosonic are not commonly used terms in the field of sound frequency. Therefore, the correct answer is Infrasonics.

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  • 2. 

    The frequency above human hearing (more than 20,000 Hz)

    • A.

      Supersonic

    • B.

      Infrasonic

    • C.

      Ultrasonic

    • D.

      Macro sonic

    Correct Answer
    C. Ultrasonic
    Explanation
    Ultrasonic refers to frequencies that are above the range of human hearing, which is typically considered to be between 20 Hz and 20,000 Hz. Ultrasonic frequencies are commonly used in various applications such as medical imaging, cleaning, and pest control. They are also utilized by animals like bats and dolphins for echolocation. Therefore, the given correct answer, "Ultrasonic," accurately describes the frequency range above human hearing.

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  • 3. 

    The dying out of sound; steady decline in loudness of the reverberation.

    • A.

      Reverberation

    • B.

      Fading

    • C.

      Bommy

    • D.

      Decay

    Correct Answer
    D. Decay
    Explanation
    Decay refers to the gradual decrease in the loudness of the reverberation or sound. As sound waves bounce off surfaces, they lose energy and eventually fade away. This process is known as decay. It is a natural phenomenon that occurs in various acoustic environments, such as concert halls or empty rooms. The answer "Decay" accurately describes the concept of the dying out of sound and the steady decline in loudness of the reverberation.

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  • 4. 

    Condition of a sounds wherein male voice range is excessively reverberant.

    • A.

      Boomy

    • B.

      Loud

    • C.

      Fidelity

    • D.

      Ringing Sound

    Correct Answer
    A. Boomy
    Explanation
    Boomy refers to a condition of sound where the male voice range is excessively reverberant. This means that the sound produced by a male voice is characterized by a deep, resonant, and booming quality. It can be caused by factors such as the acoustic properties of the room or the microphone used.

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  • 5. 

    Sounds which is discontinuous or fluctuates:

    • A.

      Direct Sound

    • B.

      Indirect Sound

    • C.

      Intermittent sound

    • D.

      Focusing Sound

    Correct Answer
    C. Intermittent sound
    Explanation
    Intermittent sound refers to sounds that occur at irregular intervals or are not continuous. This can include sounds that fluctuate in volume or have breaks in between. Unlike direct sound, which travels in a straight line from the source to the receiver, or indirect sound, which is reflected off surfaces, intermittent sound does not follow a consistent pattern. Focusing sound, on the other hand, refers to the manipulation of sound waves to concentrate them in a specific direction, and is not related to the discontinuity or fluctuation of the sound itself.

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  • 6. 

    Sound propagated through a solid structure:

    • A.

      Intermittent sound

    • B.

      Structure-borne sound

    • C.

      Air-borne sound

    • D.

      Direct Sound

    Correct Answer
    B. Structure-borne sound
    Explanation
    Structure-borne sound refers to the transmission of sound waves through a solid structure. When sound waves encounter a solid object, such as a wall or a floor, they can travel through it and cause vibrations. These vibrations then propagate through the structure, producing sound on the other side. This type of sound transmission is different from air-borne sound, which travels through the air, and direct sound, which travels in a straight line from the source to the receiver. Intermittent sound refers to sound that occurs at irregular intervals.

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  • 7. 

    Sound caused by vibrations that transmit through air:

    • A.

      Intermittent sound

    • B.

      Air-borne sound

    • C.

      Structure-borne sound

    • D.

      Direct sound

    Correct Answer
    B. Air-borne sound
    Explanation
    Air-borne sound refers to sound waves that are transmitted through the air. When an object vibrates, it creates sound waves that travel through the air and reach our ears. This is the most common type of sound that we encounter in our daily lives, such as the sound of music, voices, or any other sound that we hear in the environment. Therefore, air-borne sound is the correct answer as it accurately describes the sound caused by vibrations that transmit through the air.

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  • 8. 

    Perception of noise or ringing in the ears:

    • A.

      Pitch

    • B.

      Tinnitus

    • C.

      Decay

    • D.

      Fidelity

    Correct Answer
    B. Tinnitus
    Explanation
    Tinnitus refers to the perception of noise or ringing in the ears. It is a condition where a person hears sounds that are not present in the external environment. This can be a continuous or intermittent sound and can vary in pitch and intensity. Tinnitus can be caused by various factors such as exposure to loud noise, ear infections, certain medications, and underlying health conditions. It is often associated with hearing loss and can significantly impact a person's quality of life.

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  • 9. 

    Faithful reproduction of a sound surface:

    • A.

      Purity

    • B.

      Fidelity

    • C.

      Decay

    • D.

      Creep

    Correct Answer
    B. Fidelity
    Explanation
    Fidelity refers to the faithfulness or accuracy with which a sound surface is reproduced. It implies that the reproduction is true to the original and does not introduce any distortions or alterations. In the context of sound, fidelity is often used to describe the quality of audio reproduction systems, such as speakers or headphones, that can accurately reproduce the original sound without any loss of clarity or detail. Therefore, fidelity is the most appropriate term to describe a faithful reproduction of a sound surface.

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  • 10. 

    Noise caused by the collision of two objects:

    • A.

      Impact Noise

    • B.

      Colliding Noise

    • C.

      Break-in Noise

    • D.

      Break-out Noise

    Correct Answer
    A. Impact Noise
    Explanation
    When two objects collide, they produce a sound that is commonly referred to as impact noise. This noise occurs due to the forceful collision and the resulting vibrations and energy transfer between the objects. The term "impact" accurately describes the nature of the noise, as it is caused by the impact or collision of the two objects.

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  • 11. 

    Exterior background noise in a neighborhood (traffic, aircraft, etc.)

    • A.

      Background Noise

    • B.

      Foreground Noise

    • C.

      Ambient Noise

    • D.

      Environmental Noise

    Correct Answer
    D. Environmental Noise
    Explanation
    Environmental noise refers to the background noise present in a specific environment, such as a neighborhood. This noise can come from various sources like traffic, aircraft, construction, or other outdoor activities. It is called environmental noise because it is a part of the overall environment and can have an impact on the quality of life for individuals living in that area.

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  • 12. 

    Aka ambient noise

    • A.

      White Noise

    • B.

      Background noise

    • C.

      Impact noise

    • D.

      Environmental noise

    Correct Answer
    B. Background noise
    Explanation
    Background noise refers to the continuous or steady sounds present in a particular environment. It can include various sounds such as the hum of appliances, the buzzing of fluorescent lights, or the distant traffic noise. This type of noise is typically present in everyday situations and can be considered as the normal or expected level of noise in a given setting. It is often referred to as background noise because it is constantly present and serves as a backdrop to other sounds in the environment.

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  • 13. 

    The noise which energy is uniform over a wide range of frequencies; sounds hissy:

    • A.

      White noise

    • B.

      Ambient noise

    • C.

      Break-in noise

    • D.

      Black noise

    Correct Answer
    A. White noise
    Explanation
    White noise is a type of noise that has equal energy at all frequencies within a given range. It is called "white" because it is analogous to white light, which contains all colors of light in equal amounts. In the context of sound, white noise sounds hissy because it consists of random sound waves at different frequencies, creating a "hissing" or "shushing" sound. It is often used in audio engineering, sleep therapy, and sound masking applications. Ambient noise refers to the background noise present in a particular environment, while break-in noise and black noise are not commonly recognized terms in relation to sound.

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  • 14. 

    Noise from surroundings to interior of duct:

    • A.

      Break-in noise

    • B.

      Break-out noise

    • C.

      Interior noise

    • D.

      Exterior noise

    Correct Answer
    A. Break-in noise
    Explanation
    Break-in noise refers to the noise that enters the interior of a duct system from the surrounding environment. This can occur when there are gaps or openings in the ductwork, allowing external noise to penetrate into the ducts. The noise can come from various sources such as traffic, machinery, or other external activities. It is important to minimize break-in noise to ensure a quieter and more comfortable indoor environment.

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  • 15. 

    Noise from interior of duct going to exterior:

    • A.

      Break-out noise

    • B.

      Break-in noise

    • C.

      Interior noise

    • D.

      Exterior noise

    Correct Answer
    A. Break-out noise
    Explanation
    Break-out noise refers to the noise that escapes or breaks out from the interior of a duct and is heard on the exterior. This can occur when the duct system is not properly sealed or insulated, allowing sound waves to travel through the walls of the duct and into the surrounding environment. Break-out noise can be a nuisance for both the occupants of the building and those in the vicinity, and it is important to address it through proper duct design and insulation to minimize its impact.

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  • 16. 

    Irregular diffraction of sound in many directions:

    • A.

      Attenuation

    • B.

      Resonance

    • C.

      Scattering

    • D.

      Reverberation

    Correct Answer
    C. Scattering
    Explanation
    Scattering refers to the phenomenon where sound waves are irregularly deflected or dispersed in different directions when they encounter an obstacle or an irregular surface. This can occur when sound waves interact with objects or surfaces that have dimensions similar to the wavelength of the sound. As a result of scattering, sound is distributed in various directions, leading to a loss of sound intensity and a diffusion of the sound energy. Therefore, scattering is the most suitable explanation for the irregular diffraction of sound in many directions.

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  • 17. 

    The continuous of sound in an enclosed space after the initial source is eliminated:

    • A.

      Attenuation 

    • B.

      Diffraction

    • C.

      Resonance

    • D.

      Reverberation

    Correct Answer
    D. Reverberation
    Explanation
    Reverberation refers to the persistence of sound in an enclosed space after the initial source has been eliminated. This phenomenon occurs due to multiple reflections of sound waves off the surfaces of the room. These reflections create a complex pattern of overlapping sound waves, resulting in a prolonged decay of sound. Reverberation can affect the clarity and quality of sound in a space, and is commonly experienced in concert halls, auditoriums, and other large enclosed areas.

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  • 18. 

    A large amplitude of vibration produced when frequent is equal:

    • A.

      Scattering

    • B.

      Resonance

    • C.

      Attenuation

    • D.

      Reverberation

    Correct Answer
    B. Resonance
    Explanation
    Resonance occurs when the frequency of an external force matches the natural frequency of an object, resulting in a large amplitude of vibration. In this case, when the frequency is equal, it causes a large amplitude of vibration, indicating resonance. Scattering refers to the redirection of waves in different directions, attenuation refers to the decrease in the intensity of waves as they propagate, and reverberation refers to the persistence of sound due to multiple reflections.

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  • 19. 

    Change in direction of propagation of sound caused by bending of a barrier

    • A.

      Reflection

    • B.

      Diffraction

    • C.

      Resonance

    • D.

      Attenuation

    Correct Answer
    B. Diffraction
    Explanation
    Diffraction is the correct answer because it refers to the change in direction of propagation of sound caused by bending of a barrier. When sound waves encounter an obstacle, such as a barrier, they can bend around it and spread out into the region behind the barrier. This bending and spreading out of sound waves is known as diffraction. Reflection refers to the bouncing back of sound waves when they encounter a surface, resonance refers to the reinforcement of sound waves due to matching frequencies, and attenuation refers to the decrease in the intensity of sound waves as they travel through a medium.

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  • 20. 

    Reduction in sound level:

    • A.

      Diffraction

    • B.

      Attenuation

    • C.

      Reverberation

    • D.

      Resonance

    Correct Answer
    B. Attenuation
    Explanation
    Attenuation refers to the reduction in sound level as it travels through a medium. It occurs due to various factors such as absorption, scattering, and reflection. Unlike diffraction, which is the bending of sound waves around obstacles, attenuation specifically focuses on the decrease in sound intensity. Reverberation, on the other hand, refers to the persistence of sound due to multiple reflections in an enclosed space. Resonance is the phenomenon where an object vibrates at its natural frequency when exposed to an external force. Therefore, attenuation is the most appropriate term to describe the reduction in sound level.

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  • 21. 

    A sound field created by repeated reflections of sound from the boundaries in an enclosed space:

    • A.

      Reflective sound field

    • B.

      Resonance sound field

    • C.

      Reverberation sound field

    • D.

      Diffuse sound field

    Correct Answer
    C. Reverberation sound field
    Explanation
    A sound field created by repeated reflections of sound from the boundaries in an enclosed space is known as a reverberation sound field. In this type of sound field, sound waves bounce off the walls, ceiling, and floor, causing multiple reflections and prolonging the duration of sound in the space. This results in a lingering and decaying sound that is characteristic of reverberation.

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  • 22. 

    A sound field in which the sound comes in equal intensity from all direction:

    • A.

      Reverberation sound field

    • B.

      Diffuse sound field

    • C.

      Reflective sound field

    • D.

      Absorptive sound field

    Correct Answer
    B. Diffuse sound field
    Explanation
    A diffuse sound field refers to a sound field where the sound comes in equal intensity from all directions. In this type of sound field, the sound waves are scattered and reflected in various directions, creating a sense of spaciousness and envelopment. This is often achieved by using diffusive surfaces or by placing multiple sound sources strategically in a room. Unlike a reflective sound field where the sound is primarily reflected off hard surfaces or an absorptive sound field where the sound is absorbed by materials, a diffuse sound field ensures a more balanced and even distribution of sound throughout the space.

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  • 23. 

    A room containing a large amount of sound absorption:

    • A.

      Dead Room

    • B.

      Green Room

    • C.

      Live Room

    • D.

      Black Room

    Correct Answer
    A. Dead Room
    Explanation
    A dead room is a room that has a high level of sound absorption. This means that sound waves are absorbed rather than being reflected or reverberated. This can be achieved through the use of materials such as foam panels or acoustic tiles on the walls, floor, and ceiling. The purpose of a dead room is to minimize echo and reverberation, creating a very quiet and controlled environment for recording or scientific experiments where precise sound measurements are required.

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  • 24. 

    A room containing a small amount of sound absorption:

    • A.

      White Room

    • B.

      Black Room

    • C.

      Live Room

    • D.

      Dead Room

    Correct Answer
    C. Live Room
    Explanation
    A live room is a room that has minimal sound absorption, meaning that sound waves are able to bounce off the surfaces and create a lively and reverberant sound. This is often desirable in recording studios or concert halls where a natural and spacious sound is desired. In contrast, a dead room would have a high amount of sound absorption, resulting in a very dry and controlled sound. A white room and black room do not provide any information about the sound absorption properties of the room.

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  • 25. 

    A small opening in a barrier that allows air-borne sound to pass through it:

    • A.

      Window

    • B.

      Leak

    • C.

      Peak

    • D.

      Isolation

    Correct Answer
    B. Leak
    Explanation
    A small opening in a barrier that allows air-borne sound to pass through it is called a leak. A leak refers to a gap or hole in a surface or structure that allows the passage of air or sound. It can be found in various contexts, such as in pipes, roofs, or walls, where it can cause unwanted airflow or sound transmission.

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  • 26. 

    The auditory sensation that depends on sound pressure level and sound frequency:

    • A.

      Loudness

    • B.

      Pitch

    • C.

      Intensity

    • D.

      Isolation

    Correct Answer
    A. Loudness
    Explanation
    Loudness is the correct answer because it refers to the auditory sensation that is influenced by both sound pressure level and sound frequency. It is a measure of the perceived strength or volume of a sound, with higher sound pressure levels and frequencies typically resulting in a greater perception of loudness. Pitch, intensity, and isolation are not directly related to the combination of sound pressure level and sound frequency, making them incorrect choices.

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  • 27. 

    A listener's perception of the frequency of a pure tone:

    • A.

      Purity

    • B.

      Pitch

    • C.

      Creep

    • D.

      Tinnitus

    Correct Answer
    B. Pitch
    Explanation
    The correct answer is "Pitch". Pitch refers to the perceived frequency of a sound wave, specifically in the context of a pure tone. It is a subjective perception that allows us to distinguish between high and low frequencies. Purity, on the other hand, refers to the absence of any additional frequencies or overtones in a sound. Creep is unrelated to the perception of frequency, and tinnitus is a medical condition characterized by hearing ringing or buzzing sounds in the ears.

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  • 28. 

    A sealed room in which all surfaces are designed to completely absorb sound produced inside the room:

    • A.

      Dead room

    • B.

      Tight chamber

    • C.

      Live room

    • D.

      Anechoic chamber

    Correct Answer
    D. Anechoic chamber
    Explanation
    An anechoic chamber is a sealed room where all surfaces are designed to absorb sound completely. This means that any sound produced inside the room will be absorbed and not reflected back, creating an environment with no echo or reverberation. This is achieved through the use of materials with high sound absorption properties, such as foam or fiberglass. Anechoic chambers are commonly used for acoustic testing and research purposes, as they provide a controlled environment with minimal sound interference.

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  • 29. 

    A lack of acoustical connection:

    • A.

      Reverberation

    • B.

      Attenuation

    • C.

      Isolation

    • D.

      Loudness

    Correct Answer
    C. Isolation
    Explanation
    Isolation refers to the lack of acoustical connection between two spaces or objects. It is the process of separating or blocking sound waves from one area to another, preventing the transmission of sound. In the context of the given options, isolation is the most suitable choice as it directly relates to the concept of a lack of acoustical connection. Reverberation refers to the persistence of sound in a space, attenuation refers to the reduction in sound intensity, and loudness refers to the subjective perception of sound intensity.

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  • 30. 

    Fluctuating pressure of sound superimposed on the static air pressure:

    • A.

      Sound intensity

    • B.

      Sound pressure

    • C.

      Flutter echo

    • D.

      Echo

    Correct Answer
    B. Sound pressure
    Explanation
    The correct answer is sound pressure. Sound pressure refers to the variation in air pressure caused by the fluctuating pressure of sound waves superimposed on the static air pressure. It is a measure of the force exerted by sound waves on a surface and is commonly used to quantify the loudness or intensity of sound.

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  • 31. 

    No. of cycles per second; measured in "cps" or "Hz"

    • A.

      Frequency

    • B.

      Decibel

    • C.

      Volume

    • D.

      Wavelength

    Correct Answer
    A. Frequency
    Explanation
    Frequency refers to the number of cycles per second in a wave or oscillation. It is measured in units of "cps" or "Hz" (Hertz). This term is commonly used in various fields such as physics, electronics, and telecommunications to describe the rate at which a wave repeats its pattern. The higher the frequency, the more cycles occur in a given time period, resulting in a shorter wavelength. Therefore, frequency is the correct answer in this context.

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  • 32. 

    A quantity expressed in decibels of air-borne sound:

    • A.

      Frequency

    • B.

      Sound intensity level (SIL)

    • C.

      Sound intensity (SI)

    • D.

      Sabin

    Correct Answer
    B. Sound intensity level (SIL)
    Explanation
    Sound intensity level (SIL) is the correct answer because it is a quantity expressed in decibels of air-borne sound. Decibels are used to measure the intensity or loudness of sound, and sound intensity level specifically refers to the level of sound intensity measured in decibels. This measurement is commonly used in various fields to quantify and compare the loudness of different sounds.

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  • 33. 

    The average rate of sound energy flow through a unit area in a given direction.

    • A.

      Sabin

    • B.

      Sound intensity level (SIL)

    • C.

      Sound intensity (SI)

    • D.

      Frequency

    Correct Answer
    C. Sound intensity (SI)
    Explanation
    Sound intensity (SI) is the measure of the average rate of sound energy flow through a unit area in a given direction. It quantifies the amount of sound energy transmitted per unit of time and per unit of area. Sound intensity is typically measured in watts per square meter (W/m²). It is a crucial parameter in understanding the loudness and strength of sound waves and is used in various fields such as acoustics, engineering, and environmental studies.

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  • 34. 

    Distance between two adjacent compressions or rarefactions in a sound wave:

    • A.

      Sound gap

    • B.

      Wave distance

    • C.

      Wavelength

    • D.

      Frequency

    Correct Answer
    C. Wavelength
    Explanation
    The distance between two adjacent compressions or rarefactions in a sound wave is referred to as the wavelength. Wavelength is a fundamental property of a wave and is defined as the distance between two corresponding points on a wave, such as two adjacent compressions or rarefactions in the case of a sound wave. It is measured in meters and is inversely related to the frequency of the wave. Higher frequency waves have shorter wavelengths, while lower frequency waves have longer wavelengths.

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  • 35. 

    Measurement of No. of cycles in one second in a sound wave:

    • A.

      Pitch

    • B.

      Hertz (Hz)

    • C.

      Decible (dB)

    • D.

      Sabin

    Correct Answer
    B. Hertz (Hz)
    Explanation
    The measurement of the number of cycles in one second in a sound wave is referred to as Hertz (Hz). Hertz is the unit of frequency and represents the number of cycles or vibrations per second. In the context of sound waves, the frequency determines the pitch of the sound. Higher frequency waves have a higher pitch, while lower frequency waves have a lower pitch. Therefore, Hertz is the appropriate measurement for quantifying the frequency or pitch of a sound wave.

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  • 36. 

    Measurement of sound absorption:

    • A.

      Decibel (dB)

    • B.

      Frequency

    • C.

      Hertz (Hz)

    • D.

      Sabin

    Correct Answer
    D. Sabin
    Explanation
    The correct answer is Sabin. Sabin is a unit used to measure sound absorption. It represents the amount of sound absorbed by a material or surface. It is named after Wallace Clement Sabine, who was a pioneer in the field of architectural acoustics. The Sabin value of a material or surface depends on its size, shape, and composition. A higher Sabin value indicates better sound absorption, while a lower value indicates poor sound absorption.

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  • 37. 

    Measurement of sound pressure level, sound intensity level, or sound power level:

    • A.

      Hertz (Hz)

    • B.

      Sabin

    • C.

      Decibel (dB)

    • D.

      Volume

    Correct Answer
    C. Decibel (dB)
    Explanation
    The correct answer is Decibel (dB). The decibel is a unit used to measure the intensity or power of sound. It is a logarithmic scale that compares the sound pressure level, sound intensity level, or sound power level to a reference level. The decibel scale allows for the representation of a wide range of sound levels, from the faintest to the loudest sounds. It is commonly used in fields such as acoustics, audio engineering, and noise measurement to quantify and compare sound levels.

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  • 38. 

    Measure of sound insulation of a partition

    • A.

      Transmission coefficient

    • B.

      Absorption coefficient

    • C.

      Transmission loss (TL)

    • D.

      Reverberation TIme

    Correct Answer
    C. Transmission loss (TL)
    Explanation
    Transmission loss (TL) is the measure of sound insulation of a partition. It quantifies the reduction in sound energy as it passes through a partition, such as a wall or door. TL is expressed in decibels (dB) and represents the difference in sound intensity between the source side and the receiving side of the partition. A higher TL value indicates better sound insulation, as it means less sound is transmitted through the partition. TL takes into account both the transmission and absorption of sound, making it a comprehensive measure of the partition's sound insulation capabilities.

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  • 39. 

    Fraction of sound energy absorbed by a surface

    • A.

      Absorption coefficient

    • B.

      Reflection coefficient

    • C.

      Insulation coefficient

    • D.

      Transmission coefficient

    Correct Answer
    A. Absorption coefficient
    Explanation
    The absorption coefficient refers to the fraction of sound energy that is absorbed by a surface. It is a measure of how well a material or surface absorbs sound waves. A higher absorption coefficient indicates that more sound energy is absorbed, while a lower coefficient indicates that more sound energy is reflected or transmitted. This coefficient is important in various applications, such as designing acoustic treatments in rooms or selecting materials for soundproofing.

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  • 40. 

    A measure of the sound reflective property of a surface

    • A.

      Absorption coefficient

    • B.

      Reflection coefficient

    • C.

      Transmission coefficient

    • D.

      Transmission loss (TL)

    Correct Answer
    B. Reflection coefficient
    Explanation
    The reflection coefficient is a measure of the sound reflective property of a surface. It indicates the amount of sound that is reflected back from the surface compared to the incident sound. A higher reflection coefficient indicates a more reflective surface, while a lower reflection coefficient indicates a more absorptive surface.

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  • 41. 

    Ratio of transmitted sound energy to incident sound energy

    • A.

      Reflection coefficient

    • B.

      Absorption coefficient

    • C.

      Noise reduction coefficient

    • D.

      Transmission coefficient

    Correct Answer
    D. Transmission coefficient
    Explanation
    The transmission coefficient refers to the ratio of transmitted sound energy to incident sound energy. It measures the effectiveness of a material or medium in allowing sound to pass through it. A high transmission coefficient indicates that a large amount of sound energy is able to pass through the material, while a low transmission coefficient suggests that the material is effective in blocking or attenuating sound.

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  • 42. 

    Single number rating of the sound insulation rating of a partition

    • A.

      Outdoor-Indoor transmission class (OITC)

    • B.

      Noise isolation class (NIC)

    • C.

      Sound transmission class (STC)

    • D.

      Noise reduction coefficient (NRC)

    Correct Answer
    C. Sound transmission class (STC)
    Explanation
    The correct answer is Sound transmission class (STC). STC is a single number rating that measures the sound insulation performance of a partition. It represents the ability of a partition to reduce sound transmission from one side to the other. A higher STC rating indicates better sound insulation. OITC measures the sound transmission between outdoor and indoor spaces, NIC measures the sound isolation between adjacent spaces, and NRC measures the sound absorption capabilities of materials. However, none of these ratings specifically measure the sound insulation performance of a partition like STC does.

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  • 43. 

    Single number rating derived from the measured value of noise reduction between two rooms:

    • A.

      Sound transmission class (STC)

    • B.

      Outdoor-Indoor transmission class (OITC)

    • C.

      Noise reduction coefficient (NRC)

    • D.

      Noise isolation class (NIC)

    Correct Answer
    D. Noise isolation class (NIC)
    Explanation
    The correct answer is Noise isolation class (NIC). Noise isolation class is a single number rating that measures the effectiveness of a building element, such as a wall or floor, in reducing sound transmission between two rooms. It takes into account the transmission loss at different frequencies and provides an overall rating, indicating how well the element isolates noise. STC, OITC, and NRC are also rating systems for sound transmission and noise reduction, but they measure different aspects such as airborne sound transmission, outdoor-indoor sound transmission, and sound absorption respectively.

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  • 44. 

    Single number rating of the sound reduction effectiveness of a partition that separates the interior from the exterior:

    • A.

      Indoor-Outdoor transmission class (IOTC)

    • B.

      Outdoor-Indoor transmission class (OITC)

    • C.

      Sound Transmission Class (STC)

    • D.

      Exterior-Interior transmission class

    Correct Answer
    B. Outdoor-Indoor transmission class (OITC)
    Explanation
    The correct answer is Outdoor-Indoor transmission class (OITC). OITC is a single number rating that measures the sound reduction effectiveness of a partition that separates the exterior from the interior. It takes into account the transmission loss of sound through the partition at different frequencies and provides a comprehensive evaluation of the partition's ability to reduce sound transmission from outdoor to indoor spaces. STC, on the other hand, is a similar rating but specifically measures the sound reduction effectiveness of a partition that separates two interior spaces. IOTC and Exterior-Interior transmission class are not recognized terms in the field of acoustics.

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  • 45. 

    Single number rating derived from values of sound absorption coefficient

    • A.

      Noise isolation class (NIC)

    • B.

      Noise reduction coefficient (NRC)

    • C.

      Transmission coefficient

    • D.

      Sound transmission class (STC)

    Correct Answer
    B. Noise reduction coefficient (NRC)
    Explanation
    The Noise Reduction Coefficient (NRC) is a single number rating that is derived from the values of sound absorption coefficient. It is used to measure the effectiveness of a material or surface in reducing the amount of sound energy reflected back into a space. A higher NRC value indicates better sound absorption properties, meaning that the material or surface is more effective in reducing noise levels in a room.

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  • 46. 

    Human's ear's response to pressure fluctuations in the air caused by vibrating objects; travels in space by a phenomenon called "wave motion"

    • A.

      Noise

    • B.

      Sound

    • C.

      Volume

    • D.

      Tone

    Correct Answer
    B. Sound
    Explanation
    Sound is the correct answer because the given explanation describes the response of the human ear to pressure fluctuations in the air caused by vibrating objects. This response is perceived by humans as sound. The explanation also mentions that sound travels in space by a phenomenon called "wave motion," further reinforcing that sound is the correct answer.

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  • 47. 

    Science which deals w/ the production, control, transmission, reception, and effects of sound in an enclosed space

    • A.

      Acoustics

    • B.

      Auditory

    • C.

      Sonics

    • D.

      Phonics

    Correct Answer
    A. Acoustics
    Explanation
    Acoustics is the correct answer because it is the branch of science that specifically focuses on the production, control, transmission, reception, and effects of sound in an enclosed space. Acoustics studies how sound waves behave in different environments, such as rooms or concert halls, and how they can be manipulated for various purposes like improving sound quality or reducing noise. It also examines the impact of sound on human perception and physiology. Therefore, Acoustics is the most appropriate term to describe the science described in the question.

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  • 48. 

    Distinct reflection of original sound which results when the path of reflected sound is 20m (65ft) or more than the path of direct sound

    • A.

      Pitch

    • B.

      Echo

    • C.

      Flutter Echo

    • D.

      Creep

    Correct Answer
    B. Echo
    Explanation
    An echo is a distinct reflection of the original sound that occurs when the path of the reflected sound is significantly longer than the path of the direct sound. This results in a delay between the original sound and its reflection, creating a repetition or reverberation effect. The phenomenon of an echo is commonly observed in large open spaces or in the outdoors where sound waves can bounce off surfaces such as walls, mountains, or buildings, and travel back to the listener.

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  • 49. 

    A rapid succession of sound caused by highly reflective parallel surfaces:

    • A.

      Tinnitus

    • B.

      Flutter echo

    • C.

      Echo

    • D.

      Rapide

    Correct Answer
    B. Flutter echo
    Explanation
    A flutter echo is a rapid succession of sound caused by highly reflective parallel surfaces. This phenomenon occurs when sound waves bounce back and forth between two parallel surfaces, creating a series of repeated echoes. Unlike a regular echo, which is a single reflection of sound, a flutter echo is characterized by a rapid repetition of echoes, giving it a distinct fluttering or vibrating sound. This can be commonly heard in spaces with parallel walls, such as stairwells or empty rooms, where the sound waves bounce back and forth multiple times before dissipating.

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  • 50. 

    Caused by concave surfaces which causes a sound to converge at certain points w/ resulting in loss of energy in other parts of a room.

    • A.

      Reverberation

    • B.

      Undue focusing of sound

    • C.

      Creep

    • D.

      Resonance

    Correct Answer
    B. Undue focusing of sound
    Explanation
    Undue focusing of sound is the correct answer because when sound waves encounter concave surfaces, they converge at certain points in a room. This concentration of sound energy at specific points leads to an excessive focusing of sound, causing an imbalance in the distribution of sound energy throughout the room. As a result, other parts of the room experience a loss of sound energy, leading to an uneven and distorted sound experience known as undue focusing of sound.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 16, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 02, 2020
    Quiz Created by
    Luis
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