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HPSC Prelims 2021GS-IIQ. 77 of 198
Q. 771 markMedium
HPSC Prelims 2021·GS-II
During expiration the air will leave the lungs when the pressure inside the lungs must become
(a)equal to the atmospheric pressure
(b)lower than atmospheric pressure
(c)higher than atmospheric pressure
(d)diaphragm must contract