Fluid Dynamics MCQs
Multiple choice questions.
1.) An object moving through a fluid experiences a retarding force called.
a) tangential force. b) drag force
c) gravitational force. d) centripetal force
Ans : b) drag force
2.) The drag force increases as the speed of the object is,
a) increases. b) decreases
c) equal. d) zero
Ans : a) increases
3.) Complete the formula of drag force, F = 6πη_____
a)rv.
b) rv²
c) vr².
d) r²v²
Ans : a) rv
4.) The net force on the water droplet can be written as,
Net force = _______ – Drag force
a) Radius. b) Weight
c) Velocity. d) Gravity
Ans : b) Weight
5.) Complete the formula of terminal velocity, vt = 2gr²ρ/______
a)η². b) 9η
c) 3η². d) 3η
Ans : b) 9η
6.) The irregular or unsteady flow of the fluid is called,
a)Laminar flow. b) Turbulent flow
c) Compressible flow. d) Incompressible flow
Ans : b) Turbulent flow
7.) The fluid is Incompressible, it means it’s density is _______
a) constant. b) zero
c) equal. d) infinite
Ans : a) constant
8.) Complete the equation of continuity, A1/A2 = _________
a)v1/v2
b) v2/v1
c) 2v2/v1.
d) 2v1/v2
Ans : b) v2/v1
9.) The product of cross sectional area of the pipe and the fluid speed at any point along the pipe is _______
a) zero. b) constant
c) -one. d) equal
Ans : b) constant
10.) Complete the equation of Bernoulli’s equation
P +½ ρv² +_______= Constant
a) ρg. b) ρgh
c) ρvh. d) ρgh²
Ans : b) ρgh
11.) Complete equation of Torricelli’s theorem, v = √(2g(_____))
a)(h2 – h1).
b) (h1 – h2)
c) (h2 + h1).
d) (h1 – h2)
Ans : b) (h1 – h2)
12.) The speed of efflux is equal to the velocity gained by the fluid in falling through the _______ under action of gravity.
a) velocity. b) distance
c) acceleration. d) force
Ans : b) distance
13.) Complete the formula of venturi reaction. P1 – P2 = _______
a)½(ρv1).
b) ½(v2 – v1)
c) ½ ρv2².
d) ½(v1 – v2)
Ans : c) ½ ρv2²
14.) Layers of fluid side smoothly past eachother, it is an,
a)Laminar flow.
b) Turbulent flow
c) Compressible flow.
d) Incompressible flow
Ans : a) Laminar flow
15.) The maximum and constant velocity of an object falling vertically downwards is called,
a) Terminal velocity
b) Acceleration due to gravity
c) Orbital velocity
d) Vertical velocity
Ans : a) Terminal velocity
16.) The effect of the decrease in pressure with the increase in speed of fluid in a horizontal pipe is known as,
a)Zeeman effect.
b) Bernoulli’s effect
c) Pressure effect.
d) Venturi effect
Ans : d) Venturi effect
17.) One millimetre of mercury is equal to one __________
a)torr.
b) Newton
c) Kelvin.
d) Curie
Ans : a) torr
18.) One torr is the SI unit of
a) Force. b) Pressure
c) Angular velocity. d) Conservative field
Ans : b) Pressure
19.) If a water droplet has density ρ and volume V then the mass of that water droplet will be.
a)ρV.
b) (4/3)ρV
c) ρ/V.
d) (4/3)ρV³
Ans : a) ρV
20.) A water droplet has radius r that volume of that droplet is V = ________
a)⅓ πr².
b) 2πr
c) (4/3) πr³.
d) (¾)πr³
Ans : c) (4/3) πr³