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Sound — Class 8 CBSE Science MCQs with Solutions
Free Class 8 CBSE Science Sound MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — easy
Sound cannot travel through:
A. solids
B. liquids
C. gases
D. vacuum ✓ Correct
Solution: Sound needs a medium; a vacuum has none.
Q2 — easy
The number of vibrations per second is called:
A. amplitude
B. frequency ✓ Correct
C. wavelength
D. pitch
Solution: Frequency is measured in hertz.
Q3 — easy
The unit of frequency is the:
A. decibel
B. hertz ✓ Correct
C. newton
D. joule
Solution: One hertz is one vibration per second.
Q4 — easy
In humans, sound is produced by the:
A. lungs
B. voice box (larynx) ✓ Correct
C. nose
D. ears
Solution: Vocal cords in the larynx vibrate.
Q5 — hard
A person hears an echo because sound:
A. is absorbed
B. is reflected from a distant surface ✓ Correct
C. travels in a vacuum
D. changes frequency
Solution: Reflected sound heard separately is an echo.
Q6 — hard
Two sounds have the same loudness but different pitch. They differ in:
A. amplitude
B. frequency ✓ Correct
C. speed only
D. medium only
Solution: Pitch depends on frequency.
Q7 — hard
Planting trees along roadsides helps reduce noise pollution because leaves:
A. reflect all sound
B. absorb sound ✓ Correct
C. increase frequency
D. produce sound
Solution: Foliage absorbs and scatters sound waves.
Q8 — medium
The shrillness or pitch of sound depends on its:
A. amplitude
B. frequency ✓ Correct
C. loudness
D. medium
Solution: Higher frequency gives higher pitch.
Q9 — medium
Sound travels fastest in:
A. air
B. water
C. steel ✓ Correct
D. vacuum
Solution: Particles are closest in solids.
Q10 — medium
The audible range of frequency for humans is about:
A. 2 to 200 Hz
B. 20 to 20,000 Hz ✓ Correct
C. 200 to 2,000 Hz
D. 2,000 to 200,000 Hz
Solution: Humans hear roughly 20 Hz to 20 kHz.
Q11 — medium
Unwanted or unpleasant sound is called:
A. music
B. noise ✓ Correct
C. echo
D. pitch
Solution: Noise is unpleasant sound.