Extra 40 multiple-choice questions (MCQs) "Sound" chapter:10 of Class 8 CBSE Science, along with their answers:-
MCQs on Sound (Class 8 CBSE Science):
Sound is produced by:
(a) Light
(b) Vibrations
(c) Heat
(d) Electricity
Answer: (b) Vibrations
The number of vibrations per second is called:
(a) Amplitude
(b) Loudness
(c) Frequency
(d) Time period
Answer: (c) Frequency
The unit of frequency is:
(a) Decibel (dB)
(b) Hertz (Hz)
(c) Meter (m)
(d) Second (s)
Answer: (b) Hertz (Hz)
Loudness of sound is determined by:
(a) Frequency
(b) Amplitude
(c) Pitch
(d) Speed
Answer: (b) Amplitude
The unit of loudness is:
(a) Hertz (Hz)
(b) Meter (m)
(c) Decibel (dB)
(d) Second (s)
Answer: (c) Decibel (dB)
The pitch of sound depends on:
(a) Amplitude
(b) Frequency
(c) Loudness
(d) Speed
Answer: (b) Frequency
Sound can travel through:
(a) Solids only
(b) Liquids only
(c) Gases only
(d) Solids, liquids, and gases
Answer: (d) Solids, liquids, and gases
Sound cannot travel through:
(a) Water
(b) Steel
(c) Vacuum
(d) Air
Answer: (c) Vacuum
The voice box in humans is called:
(a) Eardrum
(b) Larynx
(c) Cochlea
(d) Auditory canal
Answer: (b) Larynx
The eardrum is a part of the:
(a) Voice box
(b) Eye
(c) Ear
(d) Nose
Answer: (c) Ear
Unpleasant sound is called:
(a) Music
(b) Noise
(c) Melody
(d) Harmony
Answer: (b) Noise
Noise pollution can cause:
(a) Hearing loss
(b) Sleeplessness
(c) Hypertension
(d) All of the above
Answer: (d) All of the above
To reduce noise pollution, we should:
(a) Play loud music
(b) Plant more trees
(c) Use vehicle horns frequently
(d) Burst crackers
Answer: (b) Plant more trees
The audible range of human hearing is:
(a) 20 Hz to 20,000 Hz
(b) Less than 20 Hz
(c) More than 20,000 Hz
(d) 10 Hz to 10,000 Hz
Answer: (a) 20 Hz to 20,000 Hz
Sound of frequency lower than 20 Hz is called:
(a) Ultrasound
(b) Infrasound
(c) Audible sound
(d) Noise
Answer: (b) Infrasound
Sound of frequency higher than 20,000 Hz is called:
(a) Infrasound
(b) Audible sound
(c) Ultrasound
(d) Noise
Answer: (c) Ultrasound
Which of the following produces sound by vibrating strings?
(a) Flute
(b)
Tabla
(c) Sitar
(d) Harmonium
Answer: (c) Sitar
Which of the following produces sound by vibrating air column?
(a) Drum
(b) Guitar
(c) Flute
(d) Cymbals
Answer: (c) Flute
The time taken for one complete oscillation is called:
(a) Frequency
(b) Amplitude
(c) Time period
(d) Loudness
Answer: (c) Time period
When amplitude of vibration is large sound produced is:
(a) feeble
(b) Loud
(c) high pitch
(d) low pitch
Answer: (b) Loud
When frequency of vibration is high, sound produced is:
(a) Low pitch
(b) high pitch
(c) low amplitude
(d) high amplitude
Answer: (b) high pitch
The middle part of the ear is called:
(a) outer ear
(b) inner ear
(c) middle ear
(d) ear drum
Answer: (c) middle ear
The inner part of the ear is called:
(a) outer ear
(b) inner ear
(c) middle ear
(d) ear drum
Answer: (b) inner ear
The external part of the ear is called:
(a) outer ear
(b) inner ear
(c) middle ear
(d) ear drum
Answer: (a) outer ear
The vibrating membrane in a drum is called:
(a) strings
(b) membrane
(c) air
column
(d) vocal cords
Answer: (b) membrane
Sound travels fastest in:
(a) Gases
(b) Liquids
(c) Solids
(d) Vacuum
Answer: (c) Solids
Sound travels slowest in:
(a) Gases
(b) Liquids
(c) Solids
(d) Vacuum
Answer: (a) Gases
The irregular and unwanted sound is called:
(a) Music
(b) Noise
(c) Melody
(d) Harmony
Answer: (b) Noise
The pleasant sound is called:
(a) Noise
(b) Music
(c) Loud sound
(d) Irregular sound
Answer: (b) Music
Which of the following is a source of noise pollution?
(a) Musical instruments
(b) Traffic noise
(c) Chirping of birds
(d) Flowing water
Answer: (b) Traffic noise
What is the range of ultrasound?
(a) Below 20Hz
(b) 20Hz to 20,000Hz
(c) Above 20,000Hz
(d) any audible sound.
Answer: (c) Above 20,000Hz
What is the range of infrasound?
(a) Below 20Hz
(b) 20Hz to 20,000Hz
(c) Above 20,000Hz
(d) any audible sound.
Answer: (a) Below 20Hz
The ossicles are present in which part of the ear?
(a) Outer ear
(b) Middle ear
(c) Inner ear
(d) Ear drum
Answer: (b) Middle ear
The cochlea is present in which part of the ear?
(a) Outer ear
(b) Middle ear
(c) Inner ear
(d) Ear drum
Answer: (c) Inner ear
The pinna is part of the:
(a) outer ear
(b) middle ear
(c) inner ear
(d) larynx
Answer: (a) outer ear
The speed of sound is maximum in:
(a) water
(b) air
(c) Steel
(d) vacuum
Answer: (c) Steel
Sound waves are:
(a) transverse waves
(b) longitudinal waves
(c) light waves
(d) radio waves
Answer: (b) longitudinal waves
The to and
for
motion of an object is called:
(a) rotation
(b) vibration
(c) revolution
(d) circular motion
Answer: (b) vibration
The time taken to complete one oscillation is called:
(a) frequency
(b) amplitude
(c) time period
(d) loudness
Answer: (c) time period
Sound is a form of:
(a) light
(b) heat
(c) energy
(d) matter
Answer: (c) energy
