CBSE Questions for Class 8 Physics Sound Quiz 3 - MCQExams.com

A tuning fork produces 20 vibrations per second. What is the frequency of the tuning fork:
  • $$40\ Hz$$
  • $$20\ Hz$$
  • $$10\ Hz$$
  • $$0\ Hz$$
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
  • 0 Hz
The back and forth motion of an object is called
  • vibration
  • rotation
  • translation
  • linear motion
Fill in the blank.
Shrillness : ______: : Loudness : Amplitude
  • Pitch
  • Speed
  • Frequency
  • None of the above
Which of the following are examples of noise pollution?
  • Sounds from factories
  • Sounds from explosion of fire crackers
  • Sounds from aircrafts
  • All of the above
Which of the following is/are example(s) of a sound having high frequency?
  • A baby's cry
  • A woman's scream
  • Chirping of birds
  • All of the above
Fill in the blank.
The length of the vocal chords in men and women is approximately _____ and _____ respectively.
  • 15 mm, 20 mm
  • 20 mm, 30 mm
  • 20 mm, 15 mm
  • 25 mm, 15 mm
In humans, the sound is produced because of the vibration of the larynx.
  • True
  • False
Unpleasant sound : Noise : : Pleasant sound :______. Fill in the blank. 
  • Audible sound
  • Infrasound
  • Music
  • Ultrasound
Presence of excessive or unwanted sounds in the environment is called 
  • music
  • sound
  • noise pollution
  • all of the above
Which of the following sounds have the highest frequency?
a) A man shouting.
b) The sound of a whistle.
c) A lion's roar.
d) The sound of a drum.
  • a
  • b
  • c
  • d
High frequency sound has a .......... pitch.
  • higher
  • softer
  • lower
  • none of the above
Sound travels the fastest in which medium ?
  • Gaseous
  • Liquid
  • Solid
  • Vacuum
If an object oscillates $$20$$ times in $$5\ sec$$, then what is the frequency of the object?
  • $$4\ Hz$$
  • $$20\ Hz$$
  • $$5\ Hz$$
  • $$100\ Hz$$
Which are the most important properties of sound?
  • Amplitude
  • Frequency
  • Loudness
  • Both A and B
If 1500 oscillations are produced in $$5$$ seconds, what is the frequency in hertz?
  • $$300\ Hz$$
  • $$150\ Hz$$
  • $$550\ Hz$$
  • None
Which of the following are true for noise pollution?
a) Noise pollution is unpleasant and discomforting.
b) Noise pollution can cause health problems.
c) Long term exposure to loud noises can cause temporary or ever permanent hearing impairment.
d) Noise pollution is caused by extremely loud sounds.
  • a and d
  • b and c
  • a, b and d
  • All of the above
Sound is a form of:
  • heat
  • vibration
  • energy
  • frequency
Voices of men, Women and children different because of:
  • the pitch
  • the length and the thickness of vocal cords.
  • both
  • none
A high pitch sound is called a ________ sound.
  • hoarse
  • loudness
  • shrill
  • timbre
A low pitch sound is called a __________ sound.
  • pulse
  • intensity
  • hoarse
  • quality
What measures must be taken to reduce noise pollution?
  • Noise creating factories must be set up away from the residential areas.
  • Trees must be planted around buildings to restrict the noise from reaching the buildings.
  • Silencing the devices and automobiles making loud noises.
  • All of the above
Mark the correct statement.
  • Time taken between two consecutive compressions or rarefactions is called the time period of the wave.
  • The sounds of a violin and a flute are different due to the difference in the medium through which they travel.
  • How the brain interprets the frequency of an emitted sound is called wavelength.
  • All the above are true
How does Sound 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
What is the name of the strings which vibrate in our voice box when we talk?
  • Oesophagus
  • Pharyngeal slits
  • Vocal cords
  • None of these
State whether given statement is True or False :
Music for one person can be noise to others.
  • True
  • False

Which of the following frequency of sound can be heard by a dog but not by a man?
  • $$50,000 \ hertz$$
  • $$15,000 \ hertz$$
  • $$42,000 \ hertz$$
  • None
The frequency of a wave traveling at a speed of $$500 m/s$$ is $$25 Hz$$. Its time period will be :
  • $$20 s$$
  • $$0.05 s$$
  • $$25 s$$
  • $$0.04 s$$

Why do we not hear the screams of a bat 
  • screams are below 30,000Hz
  • the screams are infrasonic
  • the screams are ultrasonic
  • all

Which of the following is not a characteristic of a musical sound?
  • Pitch
  • Wavelength
  • Quality
  • Loudness
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