GATE MT 2020 Q45. Figure shows schematic of a venturi meter. The cross sectional area is 100 mm^2 at A and is 50 mm^2 at B. If air is flowing through the venturi meter at a flow rate of 10^-3 m^3. S^-1, the height H in the air over-water manometer is _____________ mm (round off to the nearest integer). A. Incompressible flow with no friction losses.B. Density of air is 1 kg m^-3. C. Density water is 1000 kg m^-3. D. Acceleration due to gravity is 9.8 m s^-2.