1. An echo is heard when the reflected sound reaches the ear after at least:, 0.01 s, 0.05 s, 0.1 s, 0.5 s, The minimum distance between a person and a reflecting surface to hear an echo (speed of sound = 340 m/s) is:, 10 m, 17 m, 34 m, 100 m, 3. Reverberation is caused due to:, Absorption of sound, Multiple reflections of sound, Refraction of sound, Diffraction of sound, 4. Which of the following helps to reduce reverberation in a hall?, Marble walls, Glass windows, Heavy curtains and carpets, Concrete floor, Echo is an example of:, Refraction of sound, Reflection of sound, Diffraction of sound, Interference of sound, Which material is best for sound absorption?, Wood, Iron, Plastic, Foam, 7. Excessive reverberation makes the sound:, Louder and clearer, Softer and clearer, Distorted and unclear, Pleasant.

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