Insulation of ______ over a base concrete floor is obtained by using resilient surface material on floors.

Which of the following is not a property of good acoustic materials?

________________ are made of sheet metal of suitable size and shape to convey the conditioned air.

According to the Indian Standard Code IS: 3362-1977, in the case of natural ventilation, flow per unit area of the openi…

Sound waves reflected at a convex surface are diminished.

In winter, it becomes necessary to supplied slightly _____ air to the inside of the building.

Because of high concentration of reflected sound at the Sound foci, there is a deficiency of reflected sound at some poi…

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