List of top Fluid Mechanics Questions asked in GATE ES

A cylindrical roller gate of diameter 6.0 m and length 10.0 m is placed on a dam to store water behind it, as shown in figure.

The magnitude of the resultant force due to water acting on that gate when the water is about to spill is ______ × 106 N (rounded off to two decimal places).

Consider acceleration due to gravity (g) = 9.81 m/s2;

density of water (ρ) = 1000 kg/m3; and π = 3.14.

Water is flowing at the rate of 15 m3/s through a rectangular channel of 5 m width. If the acceleration due to gravity (g) is 9.81 m/s2, the critical velocity for the flow is ______ m/s (rounded off to three decimal places).
Consider the following statements regarding the pressure measured at a point in a fluid.
S1: Absolute pressure is gauge pressure plus atmospheric pressure.
S2: Gauge pressure is measured by considering absolute zero pressure as datum.
S3: Absolute pressure is measured by considering atmospheric pressure as datum.
S4: Vacuum pressure is negative pressure obtained by subtracting absolute pressure from atmospheric pressure.
Which ONE of the following options lists all the TRUE statements?