Fluid Mechanics
Specific speed of a centrifugal pump relates it with another pump having the

Same efficiency
Dynamic similarity
Same speed
Geometrical similarity

ANSWER DOWNLOAD EXAMIANS APP

Fluid Mechanics
A stream line is

Fixed in space in steady flow
Always the path of particle
Drawn normal to the velocity vector at every point
A line connecting the mid points of flow cross-section

ANSWER DOWNLOAD EXAMIANS APP