CBSE Questions for Class 8 Physics Sound Quiz 10 - MCQExams.com

A guitar string when struck exhibits :
  • vibratory motion
  • rotational motion
  • translatory motion
  • circular motion
With the length of vocal cords, voice quality:
  • Changes
  • Remains same
  • May or may not change
  • Remains same but loudness changes
What does a body produce when it vibrates?
  • Heat
  • Sound
  • Light
  • Electricity
Why does a guitarist need to tighten the strings of the guitar to get the correct music and sound ?
  • Tight strings force the entire guitar to vibrate.
  • It is easy to play a guitar with tight strings.
  • Tight strings look good and enhance the look of the guitar.
  • It is not important to tighten the string.
When a glass filled with water is struck with a stick, ripples are produced in the water. This indicates that
  • the glass is not vibrating.
  • the glass may or may not be vibrating.
  • the glass is vibrating.
  • none of the above is true.
What produces sound?
  • Electric current
  • Friction
  • Force
  • Vibration
A rubber string is tied to a nail on the wall. The rubber string is pulled gently and stretched slightly then:
  • sound is produced
  • rubber string moves up and down
  • the quality of sound changes with the tension of the string
  • all
What happens when you strike a metal plate with a metal stick?
  • The plate vibrates and produces sound.
  • The plate vibrates and does not produce sound.
  • The plate does not vibrate but produces sound.
  • The plate neither vibrates nor produces sound.
Why do musical instruments create sound on being played?
  • Because they vibrate.
  • Because they have a secret music player in them.
  • Both A and B
  • Can't say
Which of the following musical instruments is a wind instruments?
  • Flute
  • Drums
  • Piano
  • All of these
Sound can be
  • seen
  • touched
  • heard
  • seen, touched and heard at the same time
What is a vibration?
  • A slow to and fro motion of an object.
  • A rapid to and from motion of an object
  • A slow up and down motion of an object
  • All of these.
Noise pollution can be harmful to human beings because:
  • it can cause hearing loss
  • it can cause sleeplessness
  • can cause hypertension
  • all
How does a sound making object differ from one that is silent?
  • sound making objects vibrate
  • sound making objects oscillates
  • sound making objects shows up and down motion
  • none
Which of the following order is correct?
  • Sound $$\rightarrow$$ ear $$\rightarrow$$ inner ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ brain $$\rightarrow$$ hearing
  • Ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ Inner ear $$\rightarrow$$ hearing $$\rightarrow$$ brain $$\rightarrow$$ vibration
  • Sound $$\rightarrow$$ ear $$\rightarrow$$ inner ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ hearing $$\rightarrow$$ brain
  • Sound $$\rightarrow$$ ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ inner ear $$\rightarrow$$ brain $$\rightarrow$$ hearing
Sound can be produced by
  • striking a tuning fork
  • plucking a stretched rubber string
  • flicking a thin ruler
  • all the actions above
If a pendulum oscillates $$180$$ times in $$3$$ min, then find its frequency and time period?
  • $$20\ Hz, 3\ sec$$
  • $$1\ Hz, 18\ sec$$
  • $$4\ Hz, 10\ sec$$
  • $$1\ Hz, 1\ sec$$
Sound of explosion taking on other planets are not heard by a person on the earth. Why?
  • The sound of explosion is not so high to reach the earth.
  • Only air is present between the planets and the earth
  • There is a region of vacuum in between the planets and the earth
  • The distance between the planets and the earth is too large for the sound to travel.
How sound is produced in flute or clarinet?
  • Air in the tube vibrates
  • Skin of flute vibrates
  • The holes of the flute vibrate
  • No vibration is produced
Two astronauts on the surface of the moon cannot talk to each other. Why
  • The sounds cant propagate
  • There is no atmosphere on the surface of the moon
  • There is no medium in between the two astronauts
  • All

A child inserted a needle in a man's ear. The man became deaf. Why?
  • The needle damaged the oval window
  • The needle damaged the stirrup
  • The needle damaged the ear drum
  • All of the above
Which of the following measure can be taken to control noise pollution in our surroundings?
  • By using silencers in vehicles
  • Planting trees
  • Using noise mufflers
  • All
When we hit a thin plastic ruler firmly on a bench:
  • the free end of the ruler vibrates and produces sound
  • the end held by hand vibrates and produces sound
  • even after it stops vibrating it continues to produce sound
  • none of the above occur
Loud sound can travel a __________ distance as it is associated with_________ energy.
  • Larger, higher
  • Smaller, lower 
  • Smaller, higher
  • All can be true according to the conditions.
What is the frequency of a vibrating body whose time-period is 0.05 second?
  • 10 Hz
  • 20 Hz
  • 40 Hz
  • none
In the bell jar experiment, after starting the vacuum pump the sound gradually become fainter and finally we hear a feeble sound. Why?
  • The Vacuum pump absorbs the sound
  • The medium is sucked by the pump
  • The bell jar behaves as isolated medium
  • The bell do not produce such strong sound as it was producing earlier.
The loudness or softness of a sound is determined basically by ________.
  • frequency
  • pitch
  • amplitude
  • phase
How does sound is produced by humans?
  • In humans sound is produced by the voice box.
  • In humans sound is produced by the larynx.
  • In humans sound is produced by the upper part of the wind pipe.
  • All
If a vibrator strikes the water $$50$$ times in $$5s$$, then the frequency of wave is
  • $$10 Hz$$
  • $$0.5 Hz$$
  • $$5 Hz$$
  • $$0.1 Hz$$
A source of wave produces $$1$$ crest and $$1$$ trough in $$16\ s.$$ Find the frequency of the wave.
  • $$0.0625\ Hz$$
  • $$16\ Hz$$
  • $$100\ Hz$$
  • $$10\ Hz$$
0:0:1


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