1.

In cities, water from an overhead tank is supplied to houses using the principle of (i) difference in pressure. (ii) gravitational force. (iii) decrease of friction m pipes.

A.  Only (i)                               
B.  Only (i) and (ii)
C.         Only (ii) and (iii)
D.         (i), (ii) and (iii)
Answer» C.         Only (ii) and (iii)


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