This set of Building Materials Interview Questions and Answers for Experienced people focuses on “Acoustic Design of Auditorium”.
1. The word Acoustic is originally derived from a Greek word meaning _________
a) to write
b) to speak
c) to hear
d) to absorb
Explanation: Hence, the Acoustic is defined as the science of sound and as such, discusses the origin, propagation and auditory sensation of sound.
2. A _______________ is produced when part of the atmosphere is compressed suddenly.
Explanation: The compression produced in the atmosphere is propagated or spread away from the source. Hence, the Sound travels in the form of waves and when these waves come near over ear drums, we feel sensation of hearing.
3. A _________________ produced by sound may shatter windows and can cause damage to the Plaster of walls.
a) Wind blow
b) Sonic boom
Explanation: A sonic boom is very destructive in nature. But the most unfortunate case is when the sound damages the delicate organ to receive it, namely, the human ear. Hence, the sound pollution is an very concern problem.
4. The speed at which the sound wave travels or passed through any medium is termed as the ______________
a) Sound speed
b) Sound velocity
c) Sound intensity
Explanation: Sound velocity depends on the nature and the temperature of the medium through which the sound Travels. The sound velocity is different for different mediums.
5. For atmospheric air medium, the sound velocity at 20°C is about ________
Explanation: The speed at which the sound wave travels or passed through any medium is termed as the Sound velocity. It depends on the nature and the temperature of medium through which sound travels.
6. The ________________ is defined as the number of pressure variation which a sounding body makes in each unit of time.
Explanation: The greater the number of variations, the higher will be the Pitch. The intensity of sound is defined as the flow of sound energy per unit of time through unit area.
7. ______________ is a measure of quantity of sound energy.
Explanation: The difference between the two terms intensity of sound and loudness should also be noted. The intensity of sound is purely a physical quantity which can be accurately measured and it is independent of ear of listener.
8. The ________________ is the degree of sensation.
Explanation: The intensity of sound and loudness are totally different terms. The intensity of sound is purely physical quantity whereas loudness is not wholly physical, but partly subjective and it does depend on the ear of listener.
9. According to International agreement, the frequency is measured in ________
Explanation: The range of human ear is very wide extending from 20 Hz to 20000 Hz. It may be noted that the range from the lowest to the highest note of piano is about 27.5 Hz to 4186 Hz.
10. The speed of sound is taken as __________
a) 340 m/s
b) 3.40 m/s
c) 3400 m/s
d) 0.34 m/s
Explanation: The wavelength of sound i.e. the physical distance in air from one wave top to the next can be found out by knowing its speed and frequency with the help of formula or equation. For acoustics and sound measurement purposes, the speed of sound is taken as 340 m/s.
11. The range of audible sound too painful noise varies from ________ decibel.
a)1000000 to 1
b) 1 to 1000000
c) 10000 to 10000000
d) 1 to 130
Explanation: But this wide range is covered on logarithmic scale between 1 to 130 db units. One db unit is approximately the smallest change of sound intensity which the human ear is able to appreciate.
12. ______________ of sound is affected by frequency of sound.
Explanation: The Phon indicates the level of sounds of equal loudness at all frequencies point for convenience, The Phon and decibels differ so slightly that they may be treated as synonyms.
Sanfoundry Global Education & Learning Series – Construction and Building Materials.
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