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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 23

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