Question

Figures (a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?

Answer 1

Fig. (a) is incorrect. Accoridng to equation of continuity, i.e., av = Constant, where area of cross-section of tube is less, the velcoity of liquid flow is more. So the velocity of liquid flow at a constriction of tube is more than the other portion of tube.
Accroding to Bernoulli's Theorem,
$P+\frac{1}{2}\rho v^2$ = Constant,
where v is more, P is less and vice versa.