The content of oxygen is normally ________% in air.

Related MCQs

• The term __________ is used to indicate the science of controlling air with respect to humidity, temperature, movement of air, bacteria content, etc.
• the difference of temperature between the outside air and inside air tends to the deposition of moisture in the room surfaces known as ___________
• ________________ Gas hampers oxygen from reaching the brain.
• Oxygen and Nitrogen gas in hospitals is one type of
• For comfortable working, the ___________ content should be limited to about 0.6% by volume.
• The term _________ is used to mean the free passage of clean air in a structure.
• It is quite evident that the incoming air for ventilation should be ________ in summer and ________ in winter before it enters the room.
• Exhaust system, supply system, air conditioning, etc. comes under ________ type of ventilation system.
• _____________ is the process by which the required amount of moisture is added in the air.
• the maximum rate of air change is ______