The auditorium rear wall should be concave in shape.

For atmospheric air medium, the sound velocity at 20°C is about ____

The location of _____ depends on various factors such as structural features, composition of openings, height of room, e…

In which of the following absorbents, absorption takes place due to the frictional losses occurring due to the to and fr…

__________________ is an index which combines the effect of air movement, humidity and temperature.

Which of the following is not an acoustical defect?

Sound foci is a defect caused by _________ interior surfaces.

Clean air should contain less than ______ of suspended impurity per cubic metre.