In a studio, the noise level should be brought down to _______

Which of the following is not an acoustical defect?

Sound waves reflected at a convex surface are diminished.

_____________ is the process by which the required amount of moisture is added in the air.

__________________ are used to collect the valuable chemical or mineral dusts.

The value of __________ depends on type of activity, geographical conditions, age of occupants, etc.

Colouring of sound quality is caused due to _____

The rate of amount of water vapour present to the amount it would have contained, had it been saturated, is known as the…