Fluid Mechanics MCQ Question with Answer

Fluid Mechanics MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 15
A perfect gas

Has constant viscosity

Has zero viscosity

Is in compressible

None of the above

Question No : 16
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by

dQ/Q = 3/2 × (dH/H)

dQ/Q = 2 × (dH/H)

dQ/Q = 5/2 × (dH/H)

dQ/Q = 3 × (dH/H)

Question No : 17
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be

1000 kg

4000 kg

2000 kg

8000 kg

Question No : 18
Buoyant force is

The resultant force acting on a floating body

The resultant force on a body due to the fluid surrounding it

Equal to the volume of liquid displaced

The force necessary to maintain equilibrium of a submerged body

Question No : 19
Property of a fluid by which its own molecules are attracted is called

Adhesion

Cohesion

Viscosity

Compressibility

Question No : 20
A weir, generally, used as a spillway of a dam is

Narrow crested weir

Broad crested weir

Ogee weir

Submerged weir

Question No : 21
A balloon lifting in air follows the following principle

Law of gravitation

Archimedes principle

Principle of buoyancy

All of the above