A) Conduction
B) Convection
C) Radiation
D) Condensation
Correct Answer: B
Solution :
The phenomenon of convection is involved. Breathing by human beings increases the percentage of moisture and carbondioxide in air in the room. Moreover, the air gets warmer. The moist, warm air containing carbon dioxide becomes lighter, and hence, rises up. This air then passes out through ventilators. This causes a drop in pressure within the room. Thus, the cold and fresh air from doors and windows flows in. This continuous circulation of air is maintained within the room by the phenomenon of convection.
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