With what material are the roofs and walls covered to avoid undesirable excessive
reverberation in auditorium?

Correct option is C

The correct answer is (c) Sound-absorbent.
· In auditoriums, roofs and walls are covered with sound-absorbent materials to avoid undesirable excessive reverberation. These materials help to absorb sound waves and reduce echoes, providing better acoustics and clarity in sound transmission.
Information Booster:
· Sound-absorbent materials include items like acoustic panels, foam, carpets, and curtains, which help in minimizing sound reflection.
· Hard and Opaque materials are generally reflective and do not reduce reverberation effectively.
· Translucent refers to materials that allow light to pass through but does not relate to sound absorption.