7. A fountain pen works on the principle of A.Flow of liquids from higher to lower potential B.Capillary action C.Bernoulli's principle D.Viscosity of liquids
Option B Solution: A fountain pen is a nib pen that, unlike its predecessor, the dip pen, contains an internal reservoir of liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action.
