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QUESTION
Q62) Volume of air which remains in conducting airways and is not available for gas exchange is ... [ JKCET 2012 ]

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Vital capacitythe greatest volume of air that can be expelled from the lungs after taking the deepest possible breath.
Anatomic dead space is the total volume of the conducting airways from the nose or mouth down to the level of the terminal bronchioles, and is about 150 ml on the average in humans.
Functional residual capacity the volume of gas remaining in the lungs at the end of a normal expiration; it is the sum of expiratory reserve volume and residual volume.
Forced expiratory volume Forced expiratory volume (FEV) measures how much air a person can exhale during a forced breath
Answer : (b)