For an incompressible fluid, ρ_P = ρ_R = ρ_Q (density is constant). Substituting this into the general continuity equation ρ_P A_P v_P = ρ_R A_R v_R = ρ_Q A_Q v_Q gives:
C. A_P v_P = A_R v_R = A_Q v_Q (velocities inversely proportional to areas)
16.
The planes perpendicular to the direction of fluid flow in NCERT Fig 9.7(b) are chosen such that 'their boundaries are determined by the same set of streamlines.' This means:
A.
Temperature is constant on the planes
B.
Pressure is constant on the planes
C.
Fluid can cross the streamline walls of the flow tube
D.
No fluid enters or exits through the lateral streamline boundaries — all fluid stays within the tube formed by the streamlines
D. No fluid enters or exits through the lateral streamline boundaries — all fluid stays within the tube formed by the streamlines
17.
Water flows through a horizontal pipe of cross-sectional area 8 cm² at velocity 2 m/s. At a constriction, the area is 2 cm². The velocity at the constriction is:
