List of top Water Science and Technology Questions on Fluid Mechanics

Given below are two statements:
Statement (I): Surge irrigation is technically advanced furrow irrigation method in which water is supplied in cyclic form i.e. pulses
Statement (II): Deep percolation at upstream and runoff losses at downstream are minimum with surge irrigation.
In light of the above statements, choose the most appropriate answer from the options given below.

Estimate the friction losses of 50 m long PVC pipe having inside diameter 50 mm. The velocity of flowing water is 1.0 m/s and friction factor of pipe is 0.05.

Match List-I with List-II
List-I & List-II
(A). Steady flow & (I). Velocity changes along the length
(B). Uniform flow & (II). Velocity and depth of flow changes with time
(C). Non-uniform flow & (III). Velocity and depth of flow remains constant with time
(D). Unsteady flow & (IV). Velocity remains constant along the length

Choose the correct answer from the options given below:

Given below are two statements:
Statement (I): Shaft horse power is always less than water horse power.
Statement (II): For direct driven pump, shaft horse power is equal to brake horse power.
In light of the above statements, choose the most appropriate answer from the options given below.

A liquid flows through two similar pipes 1 and 2. If the ratio of their flow velocities V$_1$:V$_2$ be 2:3, what will be the ratio of the head loss in the two pipes?

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Surface tension is the result of cohesive forces between molecules in the bulk of a liquid.
Reason (R) : Surface tension is a measure of the energy required to increase the surface area of a liquid due to the attractive forces between molecules at the surface.
In light of the above statements, choose the correct answer from the options given below.

Froude's number is defined as the ratio of _____________

Which factor affects the surface tension of a liquid?

The hydraulic radius in channel ____________ with ____________ in wetted perimeter for a given cross-sectional area

Which of the following formula is used to calculate the hydrostatic pressure at a given depth in a fluid?

According to the Bernoulli's Theorem the sum of pressure head, velocity head, and potential head is _____________

The discharge through a trapezoidal channel is maximum when

Followings are the statements related to soil colloids.
(A). Soil colloids are inorganic in nature.
(B). Soil colloids are of extremely small size, so that they can not be seen with an ordinary light microscope.
(C). Soil colloids exhibit a large specific surface area.
(D). Soil colloids are always positively charged.
Choose the correct answer from the options given below:

Which method of drilling wells uses water and bentonite mixture (mud) as drilling fluid ?

Which of the followings statements related to pressure are correct ?
(A) Gage pressure = Absolute pressure \(-\) Atmospheric pressure
(B) Absolute pressure = Gage pressure \(-\) Atmospheric pressure
(C) Absolute pressure = Atmospheric pressure \(+\) Vacuum pressure
(D) Gage pressure = Atmospheric pressure \(+\) Vacuum pressure
Choose the correct answer from the options given below:

A swimmer is at 2 meter above the bottom in an 8 m deep rectangular pond which is filled to \(3/4^{\text{th}}\) of its depth. What will be the pressure on the swimmer?

In a hydraulic conductivity study, a 15 cm thick water-saturated soil layer was allowed a 15 cm water layer above it vertically, and the water was allowed to pass through the soil for 45 minutes. A total of 540 cc of water was collected. The cross-sectional area of the soil layer was 30 cm². Calculate the discharge rate of flow of water through the soil.

Which of the following equation expresses the velocity of settling particles as described by Stokes law ?