CBSE Questions for Class 8 Physics Sound Quiz 1 - MCQExams.com

State whether given statement is True or False
Noise pollution can cause partial hearing impairment.
  • True
  • False
Frequency ($$\nu$$) and time period $$(T)$$ are related as
  • $$\nu$$$$\times  T = 1$$
  • $$\nu$$$$/T=1$$
  • $$\nu$$$$ = T/2$$
  • $$\nu$$ = $$T^2$$
The frequencies below 20 Hz are known as infrasonic sounds.
  • True
  • False
The pitch of a given sound can be measured by its ....................
  • Frequency
  • Wavelength
  • Time period
  • Intensity
Which of the following frequencies can be heard by a normal human being?
  • $$10^4 Hz$$
  • $$10^5 Hz$$
  • $$10^6 Hz$$
  • $$10^7 Hz$$
Pitch of sound depends upon frequency of a vibrating body.
  • True
  • False
The amplitude of the vibration of an ordinary conversation between two persons is approximately
  • 10-7 metres
  • 10-9 metres
  • 10-11 metres
  • 10-13 metres
If the amplitude of a sound is doubled, then its
  • Velocity is doubled
  • Frequency is doubled
  • Wavelength is doubled
  • None of the above
If frequency of a wave is 5 Hz, then it is
  • Ultrasonics
  • Microwaves
  • Infrasonics
  • Radio waves
If the time period of a wave increases, then its frequency will
  • Increase
  • Decrease
  • Remain the same
  • First increases then decreases
The pitch of sound of a stringed instrument can be varied by varying its length.
  • True
  • False
Name the sounds of the frequencies given below $$10Hz$$.
  • $$ultrasonic$$
  • $$infrasonic$$
  • $$supersonic$$
  • None of the above
The unit of frequency is:-
  • Hertz
  • Joule
  • Ohm
  • Kilo Calorie
State whether true or false:
The frequency of a sounding body of time period 0.01 sec is 100 Hz.
  • True
  • False
1 Hz is:
  • 1 vibration per minute.
  • 360 vibration per minute.
  • 10 vibration per minute.
  • 60 vibration per minute.
Which of the following frequencies of sound elephants produce ?
  • ultrasonic
  • infrasonic
  • both A & B
  • cant say
Frequency of the sound is equivalent to 
  • Pitch
  • Wavelength
  • Amplitude
  • Waveform
Which of the following instrument is not a percussion instrument?
  • Mridangam
  • Dholak
  • Guitar
  • Tabla
Infrasound can be heard by
  • dog
  • bat
  • rhinoceros
  • human beings
Sound is produced in a bamboo flute because:
  • air starts vibrating
  • bamboo starts vibrating
  • air hits the bamboo
  • direction of air is changed
 Which of the following voice is likely to have minimum frequency?
  • Baby girl
  • Baby boy
  • A man
  • A woman
An object oscillates 50 times in one second. What would be its frequency?
  • 0.2 hz
  • 0.02 hz
  • 0.002hz
  • 50Hz
The difference between a muscial sound and noise is:
  • amplitude
  • loudness
  • vibration
  • all of the above
A source is producing 15 oscillations (waves) in 3 seconds. Find its frequency?
  • 15 Hz
  • 5 Hz
  • 0.2Hz
  • 0.66Hz
Noise pollution can cause:
  • insmonia
  • hypertension
  • hearing impairment
  • all of the above
$$Hertz$$ stands for:
  • $$second$$
  • $$second^{-1}$$
  • $$meter$$
  • $$meter^{1}$$
Which of the following sound is NOT a cause of noise pollution?
  • loud speaker
  • horn of vehicle
  • explosion
  • television
In humans, the sound is produced by:
  • larynx
  • wind pipe
  • vocal cords
  • lungs
The velocity of sound in vacuum is:
  • $$332 ms^{-1}$$
  • $$330 ms^{-1}$$
  • $$288 ms^{-1}$$
  • 0
One can be recognised by his voice due to the uniqueness of:
  • quality
  • amplitude
  • pitch
  • all of the above
0:0:1


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