CBSE Questions for Class 8 Physics Sound Quiz 12 - MCQExams.com

Match the following columns and select the correct option from the codes given below.
Column IColumn II
(i) Pressure(p) Pattern formed due to multiple reflections
(ii) Decibel(q) Unit of loudness
(iii) Richter(r) Force per unit area
(iv) Kaleidoscope(s) Scale to measure the intensity of the earthquake
  • (i) - (r), (ii) - (q), (iii) - (s), (iv) - (p)
  • (i) - (q), (ii) - (p), (iii) - (s), (iv) - (r)
  • (i) - (p), (ii) - (s), (iii) - (r), (iv) - (q)
  • (i) - (p), (ii) - (r), (iii) - (s), (iv) - (q)
A small bee produces sound while it moves. The sound is created due to
  • Grinding its teeth as it moves
  • Friction due to air
  • Flapping of wings
  • Sound due to its vocal chord
Larger the amplitude of vibration , larger is the wavelenth of the wave
  • True
  • False
The tip of a pencil attached to a spring oscillates vertically, thereby etching an overlapping straight line on a white sheet of paper. The length of this line is $$5 \ cm$$. What is the amplitude of the vibration
  • $$5 \ cm$$
  • $$10 \ cm$$
  • $$2.5 \ cm$$
  • Cannot be found
The maximum displacement of a particle in a vibratory motion is known as 
  • Time period
  • Wavelength
  • Amplitude
  • frequency
A particle completes one vibration in 2 secs. How long does it take to vibrate 25 vibrations
  • 25 sec
  • 10 sec
  • 5 sec
  • 50 sec
A sound wave, whose time period is $$3\ s$$ passes through a medium for $$30\ s$$. The number of waves that had passed through is:
  • $$10$$ waves
  • $$5$$ waves
  • $$1$$ wave
  • $$3$$ waves
A particle performs $$20$$ vibrations in $$5\ s$$. The time period of vibration is:
  • $$2.5\ s$$
  • $$0.1\ s$$
  • $$0.25\ s$$
  • $$4\ s$$
A sound wave has a speed of 200 m/s in a medium and it travels a distance of 1 m. What is the time taken by the wave to cross the medium
  • 50 ms
  • 100 ms
  • 10 ms
  • 5 ms
A particle takes 0.01 s to complete 5 vibrations, what is its frequency
  • 5 Hz
  • 10 Hz
  • 50 Hz
  • 500 Hz
Which of these picture shows the way of sound vibrations travel
Ultrasonics can be detected by:
  • Bats only
  • Human beings only
  • Bats and human beings
  • Neither bats nor human beings
The period of a source of a sound wave whose frequency is $$400 Hz$$
  • $$2.5\ s$$
  • $$2.5\ ms$$
  • $$2.5\ \mu s$$
  • $$25\ s$$
A vibrating particle displacement is zero in every 2 secs. The frequency of vibration is
  • 5 Hz
  • 0.5 Hz
  • 20 Hz
  • 2 Hz
Bell jar experiment showing sound can travel in vacuum.
  • True
  • False
Sound waves having the following frequency are audible to human beings:
  • $$5$$ cycles/sec
  • $$27000$$ cycles/sec
  • $$5000$$ cycles/sec
  • $$50,000$$ cycles/sec
An astronaut can not hear his companion's sound at the surface of moon because:
  • produced frequencies are above the audio frequency
  • sound wave does not propagate through vaccum
  • temperature is too low during night and high during day
  • none of the above
A musical instrument is producing a continuous note. This note can not be heard by a person having a normal hearing range. This note must then be passing through:
  • water
  • wax
  • vacuum
  • empty vessel
Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
  • Stretched strings
  • Stretched membranes
  • Metal plates
  • Air columns
Write true or false for below statement 
The frequency is measured in hertz. 
  • True
  • False
The loudness of sound is determined by the 
  • Amplitude of vibration
  • The ratio of amplitude and frequency of vibration
  • Frequency of vibration
  • Product of amplitude and frequency of vibration
The audible range for a normal human being is : 
  • $$ 10 $$ Hz to $$ 20, 000 $$ Hz
  • $$ 20 $$ Hz to $$ 20 $$ KHz
  • $$ 10 $$ Hz to $$ 50 $$ KHz
  • $$ 20 $$ Hz to $$ 1000 $$ Hz
Female voice is shriller than the male voice.
  • True
  • False
We can hear sound of frequency 
  • $$ 10 \,Hz $$
  • $$ 500 \,Hz $$
  • $$ 100,000\,Hz $$
  • $$ 50,000\,Hz $$
A man can hear the sound of frequency:
  • $$1\,Hz$$
  • $$1000\,Hz$$
  • $$200\,kHz$$
  • $$5\,MHz$$
Decibel is the unit of pitch of a sound.
  • True
  • False
The pitch of sound depends on frequency.
  • True
  • False
The safe limit of loudness of audible sound is 
  • 0 to 80 db
  • above 80 db
  • 120 db
  • above 120 db
Low sound such as normal breathing has loudness up to 
  • $$5$$ decibel
  • $$20-30$$ decibel
  • $$10$$ decibel
  • $$50-60$$ decibel
The sound of frequency less than $$20\ Hz$$ is known as:
  • Ultrasonic
  • Infrasonic
  • Audible
  • None of these
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