Sound Waves — Important Questions
Kerala Board · Class 10 · Physics
43 important questions from Sound Waves for Kerala Board Class 10 Physics, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Sound Waves
Which of the following are characteristics of longitudinal waves?
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Particles vibrate parallel to wave direction, Forms compressions and rarefactions, Creates pressure variations
Longitudinal waves have particles vibrating parallel to wave propagation, creating alternating compressions (high pressure) and rarefactions (low pressure). Crests and troughs are features of transverse waves.
What is the minimum distance required between a person and a reflecting surface to hear an echo distinctly? (Speed of sound = 350 m/s)
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17.5 m
For distinct echo, sound must travel for 0.1 s (persistence of hearing). Distance = speed × time = 350 × 0.1 = 35 m (total). Minimum distance to reflecting surface = 35/2 = 17.5 m.
The frequency range audible to humans is:
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20 Hz to 20,000 Hz
The normal human hearing range is from 20 Hz (lower limit) to 20,000 Hz or 20 kHz (upper limit). Sounds below 20 Hz are infrasonic, and above 20 kHz are ultrasonic.
When the length of a simple pendulum increases, what happens to its frequency?
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Decreases
As the length of a pendulum increases, its period increases, and since frequency is inversely proportional to period (f = 1/T), the frequency decreases.
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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