1.

In which of the following does friction play a helpful role? (i) Striking a match stick (ii) Playing snooker (iii) Writing on the blackboard    

A.    Only (i) and (ii)
B.  Only (ii) and (iii)
C.  Pressure at a given depth inside a stationary liquid is different at all points on the horizontal plane.
D.  (i), (ii) and (iii)
Answer» E.


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