Sound Quiz - ICSE Class 8 Science

Free practice quiz: Sound (ICSE Class 8 Science). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following characteristics of sound determines its loudness?

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

   Answer: B. Amplitude

   Loudness of a sound is directly related to its amplitude. Higher amplitude corresponds to a louder sound, and lower amplitude corresponds to a softer sound.

2. The phenomenon of 'beats' in sound occurs when:

   1. Two sound waves of the same frequency interfere.
   2. Two sound waves of very different frequencies interfere.
   3. Two sound waves of slightly different frequencies interfere.
   4. A single sound wave is reflected.
   Show answer

   Answer: C. Two sound waves of slightly different frequencies interfere.

   Beats are produced by the superposition of two waves of nearly equal frequencies. The resulting sound intensity varies periodically, creating a 'wavering' effect.

3. What is the audible range of human hearing?

   1. 20 Hz to 20,000 Hz
   2. 2 Hz to 2,000 Hz
   3. 200 Hz to 200,000 Hz
   4. 20 kHz to 200 kHz
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   Answer: A. 20 Hz to 20,000 Hz

   The typical range of frequencies that humans can hear is from approximately 20 Hertz (Hz) to 20,000 Hertz (20 kHz).

4. Which instrument utilizes the principle of resonance to produce a continuous musical tone?

   1. Drum
   2. Guitar
   3. Flute
   4. Triangle
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   Answer: C. Flute

   A flute produces sound by blowing air across an opening. The air column inside the flute vibrates at its natural frequencies, and by changing the length of the air column (using keys), different resonant frequencies are produced, creating different notes.

5. If a sound source is moving away from a stationary observer, the observed frequency will be:

   1. Higher than the emitted frequency
   2. Lower than the emitted frequency
   3. Equal to the emitted frequency
   4. Zero
   Show answer

   Answer: B. Lower than the emitted frequency

   According to the Doppler effect, when the source of sound moves away from the observer, the observed frequency decreases, resulting in a lower pitch.

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