**Fluid Mechanics Civil Engineering MCQ Questions Answers**

Fluid mechanics is a fascinating branch of physics and engineering that deals with the behavior of fluids (liquids, gases, and plasmas) and their interactions with forces and the environment. It plays a pivotal role in various fields, from designing efficient transportation systems to understanding natural phenomena like ocean currents and atmospheric dynamics. To delve deeper into the realm of fluid mechanics, one must not only grasp its theoretical concepts but also apply them to practical scenarios. Multiple Choice Questions (MCQs) provide an excellent way to test and reinforce one’s understanding of fluid mechanics. In this article, we’ll explore a set of fluid mechanics MCQs along with their answers to sharpen your knowledge in this dynamic field.

**1) The liquid used in manometers should have**

a) low density

b) high density

c) low surface tension

d) high surface tension

**2) A Newtonian fluid is defined as the fluid which**

(a) is highly viscous

(b) is compressible and non-viscous

(c) is incompressible and viscous

(d) obeys Newton’s law of viscocity

**3) An ideal fluid is one which is**

a) compressible

b) elastic and viscous

c) non-viscous and incompressible

d) of low density

**4) The line that connects all particles passing through a point is known as**

(a) streamline

(b) pathline

(c) streakline

(d) all the above.

**5) For laminar flow in circular pipes, the Darcy’s friction factor f is equal to**

a) 16/Re

b) 32/Re

c) 64/Re

d) None of these

**6) Gauge pressure is**

(a) pressure measured above complete vacuum

(b) absolute pressure + local atmospheric pressure

(c) absolute pressure – local atmospheric pressure

(d) none of the above.

**7) The pressure, in meters of oil (sp.gr.0.8) equivalent to 80 m of water is**

a) 64

b) 80

c) 100

d) 88

**8) A venturimeter is having a exit cone of**

(a) diverging angle 20°

(b) diverging angle of 5° to 7°

(c) converging angle of 20°

(d) converging angle of 5° to 7°

**9) Pressure of 200 kPa is equivalent to a head of h metres of carbon tetrachloride of relative density 1.59 where h is equal to**

a) 11.62

b) 11.92

c) 12.82

d) 13.12

**10) The nominal thickness of boundary layer may be considered the distance between the solid**

**boundary and the layer where the velocity of fluid particles is ______ of free stream velocity.**

(a) 90%

(b) 95%

(c) 99%

(d) 100%