Hydraulics And Fluid Mechanics Set 23 MCQs

Q1 | According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.

Agree

Disagree

Q2 | When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

narrow-creasted weir

broad-crested weir

Ogee weir

submerged weir

Q3 | A manometer is used to measure

low pressure

moderate pressure

high pressure

atomospheric pressure

Q4 | Stoke is the unit of

kinematic viscosity in C.G.S. units

kinematic viscosity in M.K.S. units

dynamic viscosity in M.K.S. units

dynamic viscosity in S.I. units

Q5 | Coefficient of resistance is the ratio of

actual velocity of jet at vena contracta to the theoretical velocity

area of jet at vena contracta to the area of orifice

loss of head in the orifice to the head of water available at the exit of the orifice

actual discharge through an orifice to the theoretical discharge

Q6 | The discharge in an open channel corresponding to critical depth is

zero

minimum

maximum

Q7 | The line of action of the force of buoyancy acts through the centre of gravity of the volume of the liquid displaced.

TRUE

FALSE

Q8 | Bulk modulus of a fluid is the ratio of

shear stress to shear strain

increase in volume to the viscosity of fluid

increase in pressure to the volumetric strain

critical veloity to the viscosity of fluid

Q9 | The tangential velocity of the water element having a free vortex is

directly proportional to its distance from the centre

inversely proportional to its distance from the centre

directly proportional to its (distance)2 from the centre

inversely proportional to its (distance)2 from the centre

Q10 | When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of

a triangle

a paraboloid

an ellipse

none of these

Q11 | The vlow in a pipe is neither laminar nor turbulent when Reynold number is

less than 2000

between 2000 and 2800

more than 2800

none of these

Q12 | When the Mach number is more than 6, the flow is called

sub-sonic flow

sonic flow

super-sonic flow

hyper-sonic flow

Q13 | A flow in which

elastic

surface tension

viscous

inertia

Q14 | The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

The bodies A and B have equal stability

The body A is more stable than body B

The body B is more stable than body A

The bodies A and B are unstable

Q15 | When a body is placed over a liquid, it is subjected to gravitational force and upthrust of the liquid.

TRUE

FALSE

Q16 | The discharge of a depressed nappe is 6 to 7 percent

less than

more than

Q17 | The ratio of the inertia force to the gravity force is called Froud's number.

Agree

Disagree

Q18 | When the corfficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84 (L-0.1 nH) H3/2

1.84 (L-nH) H2

1.84 (L-0.1 nH) H5/2

1.84 (L-nH) H3

Q19 | The specific weight of water in S.I. units is taken as

9.81 kN/m3

9.81 x 103 N/m3

9.81 x 10-6 N/mm3

any of these

Q20 | The vacuum pressure can be measured with the help of a piezometer tube.

TRUE

FALSE

Q21 | A flow through a long pipe at decreasing rate is called

steady

unsteady

Q22 | A venturiflume is a flumed structure constructed across a channel by restricting its width.

TRUE

FALSE

Q23 | The specific gravity of an oil whose specific weight is 7.85 kN / m3, is

0.8

1

1.2

1.6

Q24 | When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water.

TRUE

FALSE

Q25 | In case of flow through parallel pipes,

the head loss for all the pipes is same

the total discharge is equal to the sum of discharges in the various pipes

the total head loss is the sum of head losses in the various pipes

all of the above