CBSE Questions for Class 8 Physics Sound Quiz 6 - MCQExams.com

Which of the above two graphs (a) and (b) representing the human voice is likely to be the male voice ? Give a reason for your answer.

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  • A and B
  • A
  • B
  • Cannot be determined
The loudness of sound depends on:
  • its amplitude
  • its frequency
  • its time period
  • its speed

Time period of a sound wave is $$10\ ms$$. What is the frequency of the sound wave?
  • 50 Hz
  • 100 Hz
  • 200 Hz
  • 400 Hz
The frequency of sound waves can be expressed in
  • Hz
  • $$\dfrac{\text{Cycles}}{\text{second}}$$
  • $$s^{-1}$$
  • All of these
Which of the following cannot travel through vacuum?
  • Light waves
  • Heat waves
  • X-rays
  • Sound waves
If a wave completes 20 vibrations in 2.5s, then its frequency is
  • 20 Hz
  • 8 Hz
  • 200 Hz
  • 50 Hz
Hertz is the unit of:
  • Wavelength
  • Amplitude
  • Frequency
  • None of these
If a wave completes $$24$$ cycles in $$0.8 \ s$$, the time period of the above wave would be (in seconds)
  • 0.03
  • 30 
  • 0.3
  • none of these
The sounds having frequency less than $$20\ Hz$$ are called ultrasonic.
  • True
  • False
Loudness of a note increases with the increase in frequency.
  • True
  • False
Imagine a cannon being fired on the surface of the moon. Then the sound will
  • Be heard at the surface of the earth during all seasons
  • Not be heard at the surface of the earth
  • Be heard at the surface of the earth during the rainy season
  • Not be heard on the earth or on the moon
A body produces sound only if, it is
  • Made of steel
  • Made of glass
  • Plucked
  • Vibrating
Why is sound heard when a ball strikes the floor?
  • The air particles from the floor flow into our ears.
  • The air particles from the floor vibrate and pass the signal to our ears.
  • The air particles from the floor vibrate and produce transverse waves which flow through the air into our ears.
  • The wavelength of the sound wave is large enough to produce the sound.
Medium is necessary for sound to propagate.
  • True
  • False
A vibrating body :
  • Will always produce sound
  • May or may not produce sound if the amplitude of vibration is low
  • Will produce sound which is audible to humans.
  • None of the above
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Assertion is incorrect but Reason is correct
Sound cannot travel through
  • Solids
  • Liquids
  • Vacuum
  • Gases.
Which of the following statements is true?
  • Sound and light both require medium for propagation.
  • Sound can travel through vacuum, but light cannot.
  • Sound needs medium, but light doesn't need medium for its propagation.
  • Sound and light both can not travel in a medium.
Loudness does not change with change in frequency.
  • True
  • False
________ is the characteristic of a musical sound by a which a loud sound can be distinguished from a faint sound even though both have the same pitch.
  • Loudness
  • Pitch
  • Quality
  • None of these
Vibrating bodies produce ........
  • Sound
  • Heat
  • Light
  • None of these
A bomb explodes on the moon. How long will it take for the sound to reach the earth?
  • 10 seconds
  • 1000 seconds
  • 1 day
  • None of these
The amplitude of vibration and frequency can abruptly change in a what kind of sound?
  • Pitch
  • Musical sound
  • Noise
  • All of the above
Two waves of the same pitch have amplitude in the ratio 1 :What will be the ratio of their frequencies ?
  • 3 : 1
  • 1 : 3
  • 2 : 1
  • 1 : 1
The lowest pitch out of the following sources is that of a
  • Man
  • Boy
  • Lion
  • Mosquito
What is the safe limit of sound level (in $$dB$$) for our ears?
  • $$12\ dB$$
  • $$120\ dB$$
  • $$180\ dB$$
  • $$10\ dB$$
The time period of a simple pendulum is $$2 \ s$$. Find its frequency?
  • $$0.5 \ Hz$$
  • $$1 \ Hz$$
  • $$1.5 \ Hz$$
  • $$2 \ Hz$$
Choose the correct option. 
Sound cannot travel in:
  • Iron
  • Water
  • Air
  • Vacuum
Bats detect the obstacles in their path by receiving the reflected
  • infrasonic waves
  • ultrasonic waves
  • micro waves
  • radio waves
A progressive sound wave of frequency 500Hz is travelling through air with a speed of $$ 350 ms^{-1} $$. A compression maximum appears at a place at a given instant. The minimum time interval after which the rarefraction maximum occurs at the same point , is
  • $$ 200 s $$
  • $$\dfrac{1}{250} s$$
  • $$\dfrac{1}{500} s $$
  • $$\dfrac{1}{1000} s$$
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