CBSE Questions for Class 8 Physics Sound Quiz 5 - MCQExams.com

What all are the sources of noise pollution?
  • Household sources like mixers, grinders, vacuum cleaners etc.
  • Social events with loud speakers
  • Transportation noises, traffic jams
  • All of the above
Water animals are also subjected to noise pollution.
  • True
  • False
Which of the following voices is likely to have minimum frequency?
  • Baby girl
  • Baby boy
  • A man
  • A woman
According to WHO (World Health Organisation), what is the loudness limit of sound in industries?
  • $$50\ dB$$
  • $$75\ dB$$
  • $$100\ dB$$
  • $$80\ dB$$
A hummingbird beats its wings $$ 3,300$$ times per minute. Find out the frequency produced by the bird?
  • $$0.003\ Hz$$
  • $$0.018\ Hz$$
  • $$6\ Hz$$
  • $$55\ Hz$$
  • $$3300\ Hz$$
The property of ultrasonic waves used in manufacturing emulsion for photographic films is its ________.
  • High speed
  • High frequency
  • Higher wavelength
  • High amplitude
Identify which of the following wave parameter is related to the pitch of a sound?
  • frequency
  • amplitude
  • wavelength
  • period
  • speed
Identify which of the following wave parameter is related to the volume of a sound?
  • amplitude
  • speed
  • wavelength
  • period
  • frequency
Elephants communicate with
  • Sonic sound
  • Infrasonic sound
  • Ultrasonic sound
  • None of these
A wave source produces $$10$$ oscillations in $$100\ ms$$. Find the time period of the wave.
  • $$1\ s$$
  • $$0.01\ s$$
  • $$10\ s$$
  • $$0.1\ s$$
The audible range in humans is ____________.
  • $$20 Hz$$ to $$2000 Hz$$
  • $$200 Hz$$ to $$20,000 Hz$$
  • $$20 Hz$$ to $$20,000 Hz$$
  • $$200 Hz$$ to $$20 kHz$$
Which one has higher frequency?
  • Infrasonic sound
  • Ultrasonic sound
  • Audible sound
  • All of the above have same frequency
What is the unit for measuring the amplitude of a sound?
  • decibel
  • coulomb
  • hum
  • cycles
Noise is produced by
  • Vibration with high frequency
  • Regular vibration
  • Regular and periodic vibration
  • Irregular and non-periodic vibration
Which of the following is the vibrating part of Banjo?
  • Stretched- Membrane
  • Stretched- String
  • Air column
  • None of the above
Men sound on the ground at a fixed distance from a siren which emits the sound of fixed amplitude. The man hears the sound to be louder in a clear night than on a clear day.
  • True
  • False
When the pitch of note produced by a harmonium is lowered, then the wavelength of the note:
  • decreases
  • first decreases and then increases
  • increases
  • remains the same
What is the approximate range of audible sound frequencies for a human with good hearing?
  • From $$20Hz$$ to $$2000Hz$$
  • From $$20Hz$$ to $$20000Hz$$
  • From $$200Hz$$ to $$20000Hz$$
  • From $$200Hz$$ to $$200000Hz$$
Which one of the following is correct about the above statements?
  • Statement 1 is true and 2 is false
  • Statement 1 is false and 2 is true
  • Both 1 and 2 are false
  • Both a and 2 are true
  • None of these
A particle vibrates 10 times in 1 sec. What is the time period of vibration of the particle?
  • 10 sec
  • 1 sec
  • 0.1 sec
  • 0.01 sec
Which of the following statement best describes frequency?
  • the maximum disturbance caused by a wave
  • the number of complete vibrations per second
  • the distance between one crest of a wave and the next one
  • the distance travelled by a wave per second
Write true or false for the following statements :
The audible range of frequencies is $$ 20\, Hz - 20 \, KHz $$ . 
  • True
  • False
The unit of loudness of sound is decibel (db) 
  • True
  • False
Time taken to complete one vibration is called 
  • Frequency
  • Time period
  • Amplitude
  • None of these
Sound corresponding to which frequency is ultrasonic sound?
  • 30 Hz
  • 300 Hz
  • 3000 Hz
  • 30,000 Hz
When we change feeble sound to loud sound we increase its :
  • frequency
  • amplitude
  • velocity
  • wavelength
The loudness of sound is determined by the
  • amplitude of vibration
  • ratio of amplitude and frequency of vibration
  • frequency of vibration
  • product of amplitude and frequency of vibration
In the bell jar experiment, as air is removed from the jar :
  • intensity of sound falls
  • speed of sound falls
  • intensity of sound increase
  • speed of sound increases.
1 hertz is equal to
  • 1 vibration per minute
  • 10 vibrations per minute
  • 60 vibrations per minute
  • 600 vibrations per minute
A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case
  • sound will be louder but pitch will not be different
  • sound will be louder and pitch will also be higher
  • sound will be louder but pitch will be lower
  • both loudness and pitch will remain unaffected
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