Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. The property of a fluid which enables it to resist tensile stress is known as
a. Compressibility
b. Surface tension
c. Cohesion
d. Adhesion
Q. The loss of pressure head in case of laminar flow is proportional to
a. Velocity
b. (Velocity)2
c. (Velocity)3
d. (Velocity)4
Q. The surface tension of mercury at normal temperature compared to that of water is
a. More
b. Less
c. Same
d. More or less depending on size of glass tube
Q. An air vessel is provided at the summit in a siphon to
a. Avoid interruption in the flow
b. Increase discharge
c. Increase velocity
d. Maintain pressure difference
Q. The unit of viscosity is
a. Metres² per sec
b. kg-sec/metre
c. Newton-sec per metre²
d. Newton-sec per meter
Q. Select the correct statement
a. Weber's number is the ratio of inertia force to elastic force.
b. Weber's number is the ratio of gravity force to surface tension force.
c. Weber's number is the ratio of viscous force to pressure force.
d. Weber's number is the ratio of inertia force to surface tension force.
Q. Choose the wrong statement. Alcohol is used in manometer, because
a. Its vapour pressure is low
b. It provides suitable meniscus for the inclined tube
c. Its density is less
d. It provides longer length for a given pressure difference
Q. When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid
a. Remains horizontal
b. Becomes curved
c. Falls on the front end
d. Falls on the back end
Q. A pressure of 25 m of head of water is equal to
a. 25 kN/ m²
b. 245 kN/ m²
c. 2500 kN/m²
d. 2.5 kN/ m²
Q. The hammer blow in pipes occurs when
a. There is excessive leakage in the pipe
b. The pipe bursts under high pressure of fluid
c. The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
d. The flow of fluid through the pipe is gradually brought to rest by closing of the valve
Q. The resultant upward pressure of the fluid on an immersed body is called
a. Up-thrust
b. Buoyancy
c. Center of pressure
d. All the above are correct
Q. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
a. Narrow-crested weir
b. Broad-crested weir
c. Ogee weir
d. Submerged weir
Q. If the surface of liquid is convex, men
a. Cohesion pressure is negligible
b. Cohesion pressure is decreased
c. Cohesion pressure is increased
d. There is no cohesion pressure
Q. The atmospheric pressure with rise in altitude decreases
a. Linearly
b. First slowly and then steeply
c. First steeply and then gradually
d. Unpredictable
Q. Dynamic viscosity of most of the gases with rise in temperature
a. Increases
b. Decreases
c. Remain unaffected
d. Unpredictable