Sound Quiz - ICSE Class 10 Physics

Free practice quiz: Sound (ICSE Class 10 Physics). 54 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. A sound wave in air has a frequency of 200 Hz and a wavelength of 1.5 m. What is the speed of sound in air?

   1. 200 m/s
   2. 300 m/s
   3. 400 m/s
   4. 150 m/s
   Show answer

   Answer: B. 300 m/s

   The speed of a wave (v) is related to its frequency (f) and wavelength (λ) by the equation v = fλ. Given f = 200 Hz and λ = 1.5 m, the speed v = 200 Hz * 1.5 m = 300 m/s.

2. A sound wave has an amplitude of 5 units. If the amplitude is doubled, the intensity of the sound will:

   1. Remain the same
   2. Double
   3. Become four times
   4. Become half
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   Answer: C. Become four times

   The intensity of a wave is proportional to the square of its amplitude (I ∝ A²). If the amplitude is doubled (A becomes 2A), the intensity becomes (2A)² = 4A², meaning it becomes four times the original intensity.

3. Two sound waves have frequencies of 250 Hz and 500 Hz. Which sound is likely to be perceived as louder?

   1. The 250 Hz sound
   2. The 500 Hz sound
   3. Both will be equally loud if their amplitudes are the same
   4. Loudness is not related to frequency
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   Answer: C. Both will be equally loud if their amplitudes are the same

   Loudness is primarily determined by the amplitude (or intensity) of the sound wave, not its frequency. While human hearing sensitivity varies with frequency, for the same amplitude, both sounds would have the same perceived loudness.

4. What is the primary characteristic of sound that determines its loudness?

   1. Frequency
   2. Wavelength
   3. Amplitude
   4. Speed
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   Answer: C. Amplitude

   Loudness is a subjective perception of sound intensity, which is directly related to the amplitude of the sound wave. A larger amplitude corresponds to a louder sound.

5. The loudness of a sound is related to its:

   1. Amplitude
   2. Frequency
   3. Speed
   4. Wavelength
   Show answer

   Answer: A. Amplitude

   Loudness is a subjective perception of sound intensity, which is directly proportional to the square of the amplitude of the sound wave. A larger amplitude means a louder sound.

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