This set of Audio Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Nature of Sound – 2”.
1. What can be termed as the intensity of compressions and rarefaction produced in the medium?
a) Frequency
b) Cycle
c) Wavelength
d) Amplitude
View Answer
Explanation: The amplitude of a wave relates to the maximum amount of displacement of a particle on the medium from its rest position. In short, the amplitude is the total distance from ground (rest) to top of wave (crest).
2. What is termed as a pattern which repeats itself over time?
a) Wavelength
b) Frequency
c) Amplitude
d) Periodic Vibration
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Explanation: A pattern that repeats itself over time is called as periodic vibration. A periodic vibration is performed by ‘tuning fork’, ‘rocking chair’, ‘bouncing ball’, ‘the earth in its orbit around the sun’ and ‘swing in a motion’.
3. What is termed as one repetition of the pattern?
a) Velocity
b) Cycle
c) Frequency
d) Wavelength
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Explanation: The events which are continuously repeated in same order is called a cycle. Thus, cycle is termed as one repetition of the pattern. One cycle of a specified event is measured one second in time which is equal to 1 Hz.
4. What is termed as time required to complete one cycle of vibration?
a) Amplitude
b) Wavelength
c) Period
d) Cycle
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Explanation: Period is termed as time required to complete one cycle of vibration. For example, if 20 cycles are completed in 1 second, the period is 1/20th of the second(s), or 0.05 s. For speech applications, the most commonly used unit of measurement for period is the millisecond.
5. The unit of measurement of frequency is hertz (HZ).
a) True
b) False
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Explanation: Frequency is defined as the number of cycles completed in one second. The unit of frequency is hertz (Hz) and also known as cycles per second (cps). Conceptually, frequency is simply the rate of vibration.
6. Wavelength is given by f = 1 / T.
a) True
b) False
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Explanation: The distance between any point on a wave and the equivalent point on the next cycle is called wavelength. Literally, the length of the wave is called as wavelength. It is given by λ = v / f.
7. What can be expressed as distance travelled in one second?
a) Phase
b) Velocity
c) Period
d) Wavelength
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Explanation: The frequency of waveform is determined by the frequency of the resulting source. Velocity can be expressed as distance travelled in one second. It is a vector quantity, which means we need both magnitude (speed) and direction to define velocity.
8. What is the velocity at 0° C?
a) 331 m/s
b) 339 m/s
c) 351 m/s
d) 431 m/s
View Answer
Explanation: Velocity can be expressed as distance travelled in one second. The pressure of air is obviously caused by the velocity of the air molecules. At 0° C the speed of sound in air is approximately 331.5 m/s. The velocity at 0° C is about 331 m/s.
Sanfoundry Global Education & Learning Series – Audio Engineering.
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