Q. For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass
A) In more air
B) In cool air near the bottom and hot air out near the roof
C) In hot air near the roof and cool air out near the bottom
D) Out hot air near the roof
Explanation
(b) Density of hot air is lesser than the density of cold air so hot air rises up
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.