# Objective Type Questions on Fluid Mechanics

**Objective Type Questions on Fluid Mechanics**

**1-A Differential manometer measures**

(A) difference in pressure between two points

(B) difference in total energy between two points

(C) local atmospheric pressure

(D) absolute pressure at a point

**2-The condition of ‘No slip’ at rigid boundaries is applicable to flow of**

(A) all non-Newtonian fluids

(B) all real fluids

(C) ideal fluids only

(D) Newtonian fluids only

**3-Pitot tube is used for measurement of**

(A) discharge

(B) velocity at a point

(C) flow of ideal fluids only

(D) low pressures

**4-The frictional resistance of a pipe varies approximately with the ___ of the liquid.**

(A) cube of velocity

(B) square of velocity

(C) velocity

(D) pressure

**5-The lift force on a body is**

(A) due to drag on the body

(B) the component of the resultant force in a direction normal to relative velocity

(C) the component of the resultant force in the vertical direction

(D) due to buoyant force

**6-For subsonic flow, if the area of flow increases**

(A) velocity is infinity

(B) velocity decreases

(C) velocity increases

(D) velocity is constant

**7-The difference between the total head line and the hydraulic grade line represents**

(A) the elevation head

(B) the pressure head

(C) the piezometric head

(D) the velocity head

**8-The equation of motion for laminar flow of a real fluid is known as**

(A) Reynold’s equation

(B) Navier-Strokes equation

(C) Bernoulli’s equation

(D) Euler’s equation

**9-The following is not a dimension-less number**

(A) Coefficient of Velocity (C_{V})

(B) Manning’s coefficient (n)

(C) Coefficient of drag (C_{D})

(D) Darcy-Weisbach friction factor (f)

**10-The notch angle for maximum discharge over a triangular notch is**

(A) 90°C

(B) 75°C

(C) 60°C

(D) 45°C

**ANSWERS:**

**1-(A), 2-(B), 3-(B), 4-(B), 5-(B), 6-(B), 7-(D), 8-(B), 9-(B), 10-(A)**