chap.6 Fluid mechanics MCQs with solution

Fluid mechanics

1)	The study of properties of fluids in motion is    called    a) Fluid                              b) Fluid statics    c) Fluid dynamics           d) None	C
2)	The dimensions of coefficient of viscosity   are.    a) ML1T-1                            b) M2L1T1    c) M L-1T-1                                     d) M2 L-1T-1	C
3)	𝜂 Is denoted for coefficient of:    a) Friction                          b) Viscosity    c) Linear expansion       d) Gravitational customer	B
4)	The SI unit of coefficient of viscosity is:    a) 𝑘𝑔 𝑚−1 𝑠 −1                 b) 𝑘𝑔 𝑚−2 𝑠 −1    c) 𝑘𝑔 𝑚−2 𝑠 −2                 d) 𝑘𝑔 𝑚2 𝑠	A
5)	An object moving through a fluid experience   a retarding force called    a) Drag force                     b) Gravitational force    c) Terminating force     d) Frictional force	a
6)	The maximum constant velocity of an object    falling vertically downward is called:    a) Final velocity              b) Terminal velocity    c) Initial velocity            d) None of these	B
7)	The drag force increases as the speed of the    object    a) Increases                       b) Decreases    c) Remain constant        d) None of these	A
8)	The equation 𝐹 = 6𝜋𝜂𝑟𝑣 is called:    a) Newton’s law              b) Stoke’s law    c) Ohm’s law                     d) Lenz’s law	B
9)	Stokes law is applicable if body has   __________ shape.    a) Rough                             b) Square    c) Circular                          d) Spherical	D
10)	The drag force F on a sphere of radius r    moving slowly with speed v through a fluid     of viscosity 𝜂 is     a) 6𝜋𝜂 𝑟2 𝑣                         b) 6𝜋𝜂 𝑟 𝑣     c) 6𝜋 2 𝜂 𝑟 𝑣                       d) 6𝜋𝜂 𝑟 𝑣 2	B
11)	Drag force is given by     a) Newton’s law              b) Pascal’s law     c) Gauss’s law                   d) Stoke’s law	D
12)	When weight of an object falling freely    becomes equal to the drag force, then the    body will move with     a) Increasing speed        b) Decreasing speed     c) Constant speed           d) None of them	C
13)	When the body reaches its terminal velocity,    the acceleration of the body becomes     a) Maximum speed        b) Minimum speed     c) Zero                                 d) Constant quantity	c
14)	As the water falls from tap, its speed     increases and cross sectional area:     a) Zero                                 b) Increases     c) Decreases                      d) Remains constant	C
15)	If radius of droplet becomes half then its     terminal velocity will be     a) Half                                  b) Double     c) One forth                       d) Four times	C
16)	Turbulent flow is: a)Unsteady and regular               b)Steady and regular c)Unsteady and irregular d)Steady and regular	C
17)	The flow of ideal fluid is always: a…Turbulent                     b)Streamline c)Irregular                         d)Straight line	B
18)	Irregular flow of fluid is called: a)Streamline                     b)Turbulent c)Uniform                          d)Laminar	B
19)	According to equation of continuity, A1V1 =    A2V2 = constant. The constant is equal to: a)Flow rate                        b)Volume of fluid c)Mass of fluid                 d)Density of fluid	A
20)	Equation of continuity is obtained by    applying law of conservation of     a) Mass                                b) Energy     c) Momentum                  d) All	A
21)	If cross-sectional area of pipe decreases, the    speed of fluid must increase according to: a)Venturi relation b)Bernoulli’s equation c)Equation of continuity d)Torricelli’s theorem	c
22)	In equation of continuity, the units of Av is     given as: a)Cubic meter b)Cubic meter per second c)Square meter per second d)Square meter	B
23)	The law of conservation of mass gives:     a) Bernoulli’s equation     b) Equation of continuity     c) Torricelli theorem     d) None of these	B
24)	Bernoulli’s theorem applies to: a)Solids                               b)Plasma state c)Fluids                               d)Liquids	C
25)	Velocity of fluid increases where the    pressure is: a)Low                                  b)High c)Constant                         d)Changes continuously	A
26)	Speed of efflux can be determined by    applying: a)Pressure-velocity relationship b)Torricelli’s theorem c)Venture relation d)All	B
27)	Venturi meter is a device used to measure:     a) Pressure of the fluid     b) Speed of fluid     c) Density of fluid     d) Viscosity of the fluid	B
28)	A man standing near a fast moving train     may fall.     a) Away from the train     b) Towards the train     c) On himself     d) None of these	B
29)	Bernoulli’s equation is obtained by applying     law of conservation of.     a) Mass                                b) Energy     c) Momentum                  d) Fluid	b
30)	Ideal fluid is.     a) Non-viscous     b) Incompressible     c) Steady flow     d) Possess all properties	D
31)	Velocity of efflux is measured by relation b)                                                 b) c)                             d)	C