Question

It is seen that in proper ventilation of building, windows must be opened near the bottom and the top of the walls, so as to let pass.

• A. In hot near the roof and cool air out near the bottom
• B. Out hot air near the roof
• C. In cool air near the bottom and hot air out near the roof
• D. In more air

Answer 1

The correct option is C In cool air near the bottom and hot air out near the roof

Breathening at a place increases moisture and temperature. Moist and hot air being lighter rises up and leaves the room through the ventilator near the roof and fresh air rushes into the room through the doors. If there had been no ventilator, hot air will accumulate near the roof in the room and increasing pressure will stop the entry of fresh air into the room through the door or ventilator near the bottom. This will result in suffocation.