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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
Perforated card boards are used in halls, for:
  • A
    Reflection of sound
  • ✓
    Absorption of sound
  • C
    Refraction of sound
  • D
    As a decorative material
✓

Answer

Correct option: B.
Absorption of sound
Perforated cardboard gypsum boards are an economical and efficient option to incorporate into projects, absorbing the sound and reducing the noise level generated by the reverberation through different patterns and shapes.

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