Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because
a. It is easier to see through the glass tube
b. Glass tube is cheaper than a metallic tube
c. It is not possible to conduct this experiment with any other tube
d. All of the above
Q. To avoid an interruption in the flow of a siphon, an air vessel is provided
a. At the inlet
b. At the outlet
c. At the summit
d. At any point between inlet and outlet
Q. When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is
a. 1.84(L - 0.1nH)H3/2
b. 1.84(L - nH)H2
c. 1.84(L - 0.1nH)H5/2
d. 1.84(L - nH)H3
Q. In an isothermal atmosphere, the pressure
a. Decreases linearly with elevation
b. Remain constant
c. Varies in the same way as the density
d. Increases exponentially with elevation
Q. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be
a. 2 meters of water column
b. 3 meters of water column
c. 5 meters of water column
d. 6 meters of water Column
Q. The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to
a. Buoyancy
b. Equilibrium of a floating body
c. Archimedes' principle
d. Bernoulli's theorem
Q. The liquid used in manometers should have
a. Low density
b. High density
c. Low surface tension
d. High surface tension
Q. Which of the following instrument can be used for measuring speed of an aeroplane?
a. Venturimeter
b. Orifice plate
c. Pitot tube
d. Rotameter
Q. Buoyant force is
a. Resultant force acting on a floating body
b. Equal to the volume of liquid displaced
c. Force necessary to keep a body in equilibrium
d. The resultant force on a body due to the fluid surrounding it
Q. In case of flow through parallel pipes,
a. The head loss for all the pipes is same
b. The total discharge is equal to the sum of discharges in the various pipes
c. The total head loss is the sum of head losses in the various pipes
d. Both (A) and (B)
Q. Rotameter is a device used to measure
a. Absolute pressure
b. Velocity of fluid
c. Flow
d. Rotation
Q. In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.
a. Equal to
b. One-third
c. Two-third
d. Three-fourth
Q. When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as
a. Centre of pressure
b. Centre of gravity
c. Centre of buoyancy
d. Metacentre