Q.

A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of

A. gravitational force between train and man.
B. illusion of the man
C. the centripetal force
D. pressure difference due to fast moving air in between
Answer» D. pressure difference due to fast moving air in between
Explanation: When a fast-moving train passes a man standing on the platform at rest, the air between train and person also moves with greater speed. This rapidly moving air, by Bernoulli's principle will have a lower pressure than the still air a few feet away. The still air, having higher pressure, and being behind the man standing close will tend to push him toward the train.
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