Surge wave in a rectangular channel is an example of _______.

i)    steady flow
ii)   unsteady flow
iii)    uniform flow
iv)    non-uniform flow
The correct answer is
a)    (i) and (iii)
b)    (ii) and (iii)
c)    (i) and (:v)
d)    (ii) and (iv)

Ans: d