i. gripped the imagination of: received much attention
ii. dawned upon: realised it for the first time
iii. ushered in: began the new idea
iv. passed into current coin: have been brought into use
v. passport of the future: a thing that makes something possible or enables one to achieve it, authorization of growth
Figures 9.20(a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?