@Adarsh
in this question they are asking that what will be the pulmonary volume inhaled by the person immediately under the normal condition without applying any extra effort after exhaling out forcefully then it will be equal to the tidal volume and expiratory reserve volume (TV+ERV). Where, expiratory reserve volume (ERV) is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume.
Posted by
Priyanka Kumari