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CBSE Questions for Class 8 Physics Sound Quiz 7 - MCQExams.com

The heart of a man beats 75 times a minute. What is its time period?
  • 0.75s
  • 1.33s
  • 1.25s
  • 0.8s
Two people can hear the sound of each other on the moon's surface. 
  • True
  • False
Complete the following sentence.

Sound can not travel through ..............................., but it requires a ................... .
  • air,medium
  • water,medium
  • solids,medium
  • vacuum,medium
The sketches I to IV in Fig. show sound waves, all formed in the same time interval. Which diagram shows a bass (low frequency) note?
178172_c8b9dbffd86c4a8d866f768a497fbf6d.png
  • I
  • II
  • III
  • IV
The heart of a man beats 75 times a minute. What is its frequency?
  • 1.25 s1
  • 2.5 s1
  • 7.5 s1
  • 75 s1
Different musical instruments sound different even when they play a note with the same pitch.
  • True
  • False
  • Ambiguous
  • Data insufficient
No sound is possible in a .......... .
  • Vacuum
  • Solid
  • Gases
  • Medium
Sound waves requires a .......... to travel through.
  • Medium
  • Vacuum
  • Both A and B
  • None of these
A sound of wave produces 40 crests and 40 troughs in 0.4s. What is the frequency of the wave?
  • 10 Hz
  • 50 Hz
  • 100 Hz
  • 150 Hz
A sound wave has a frequency of 192 Hz and travels the length of a football field, 91.4 m, in 0.27 s. What is the period of the wave?
  • 1.3×103s
  • 2.6×103s
  • 5.2×103s
  • 7.8×103s
The waves that transfer vibrations and disturbance are:
  • Sound waves
  • Ultrasonic waves
  • Infrared waves
  • All of the above
The relation between frequency(f) and time period(T) is given by
  • f = T
  • f = 1T
  • T = f2
  • T = f3
Water waves in a shallow dish are 6cm long. At one point, the water moves up and down at a rate of 4.8 oscillations/s. What is the time period of the water waves?
  • 0.280 s
  • 0.408 s
  • 0.208 s
  • 0.308 s
In a ripple tank, 10 full ripples/s are produced. The distance between peaks of consecutive trough and crest is 15 cm. Calculate the frequency.
  • 5Hz
  • 10Hz
  • 15Hz
  • 20Hz
What is necessary for the production and transmission of sound?
  • Medium
  • Acceleration
  • Reciever
  • None of the above
Which figure indicates vibrations of sound produced by noise
270321_51d2e4a0a4b8401984bfc74387c00532.png
  • (i) only
  • (ii) only
  • (i) and (ii)
  • None
How are noise and music interrelated?
  • Noise is unpleasant whereas music is pleasant
  • Noise pollution causes health hazards whereas music has soothing effect
  • When musical instruments produce loud sound it becomes noise
  • All of the above
Sound waves travel in all directions from the source through a medium.
  • True
  • False
Unwanted sound is called .......... .
  • Echo
  • Noise
  • Decibel
  • Vibration
The audible range of sound for human is:
  • 20Hz to 20000Hz
  • 20Hz to 2000Hz
  • 20Hz to 200000Hz
  • 5Hz to 10000Hz
Which graph represents music ?
270326_78401365cd874e31adc0547684b6b15c.png
  • (i)
  • (ii)
  • Both (i) and (ii)
  • None of the above
Why can supernova explosions in space be seen but not heard on earth?
  • Because sound cannot travel in vacuum but light can.
  • Because light cannot travel in vaccum but sound can
  • Because sound produced is beyond audible range of human ears.
  • None of these.
Pattern of wave in noise is____.
  • Regular
  • Irregular
  • Sinusoidal
  • None of the above
The highness or lowness of sound is -
  • Frequency
  • Pitch
  • Vibrations
  • None
I am the cause of production of all sounds.
  • Vibrations
  • Amplitude
  • Frequency
  • Echo
(7) Which is an undesirable sound and harmful for health.
  • Noise
  • Echo
  • Music
  • None of the above
(6) I am the kind of sound produced by earthquakes.
  • Infrasonic sound
  • Ultrasonic sound
  • Audible sound
  • None of these
The pitch is determined by the _________________ of the vibrating body.
  • Frequency
  • Amplitude
  • Speed
  • Loudness
Sound of frequency below 20 Hz is called
  • Audio sounds
  • Infrasonics
  • Ultrasonics
  • Supersonics
The frequency of a given sound is 1.5kHz. How many vibrations does it complete in one second?
  • 1.5
  • 750
  • 1500
  • 6.6×104
0:0:2


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