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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 13

Q1 | Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as

- Lift
- Drag
- Stagnation pressure
- Bulk modulus

Q2 | Which of the following is dimensionless?

- Specific weight
- Specific volume
- Specific speed
- Specific gravity

Q3 | 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

Q4 | Mercury does not wet glass. This is due to property of liquid known as

- Adhesion
- Cohesion
- Surface tension
- Viscosity

Q5 | A flow in which __________ force is dominating over the viscosity is called turbulent flow.

- Elastic
- Surface tension
- Viscous
- Inertia

Q6 | Specific weight of sea water is more that of pure water because it contains

- Dissolved air
- Dissolved salt
- Suspended matter
- All of the above

Q7 | In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

- Less than
- More than
- Equal to
- None of these

Q8 | An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submergedin a fluid having specific gravity of

- 1
- 1.2
- 0.8
- 0.75

Q9 | The factional resistance of a pipe varies approximately with __________ of the liquid.

- Pressure
- Velocity
- Square of velocity
- Cube of velocity

Q10 | For measuring flow by a Venturimeter, if should be installed in

- Vertical line
- Horizontal line
- Inclined line with flow downward
- In any direction and in any location

Q11 | The ratio of the inertia force to the elastic force is called

- Reynold's number
- Froude's number
- Weber's number
- Mach number

Q12 | All the terms of energy in Bernoulli's equation have dimension of

- Energy
- Work
- Mass
- Length

Q13 | The pressure at a point 4 m below the free surface of water is

- 19.24 kPa
- 29.24 kPa
- 39.24 kPa
- 49.24 kPa

Q14 | Specific weight of water in S.I. units is equal to

- 1000 N/m 3
- 10000 N/m3
- 9.81 × 103 N/m3
- m3

Q15 | In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

- Less than
- More than
- Equal to
- None of these

Q16 | Poise is the unit of

- Surface tension
- Capillarity
- Viscosity
- Shear stress in fluids

Q17 | Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow.

- Sum
- Different
- Product
- Ratio

Q18 | The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

- Equal to
- Less than
- More than
- None of these

Q19 | 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

Q20 | The horizontal component of buoyant force is

- Negligible
- Same as buoyant force
- Zero
- None of the above

Q21 | A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.

- Steady
- Streamline
- Turbulent
- Unsteady

Q22 | The divergent portion of a Venturimeter is made longer than convergent portion in order to

- Avoid the tendency of breaking away the stream of liquid
- To minimise frictional losses
- Both (A) and (B)
- None of these

Q23 | According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C =Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)

- A × m × i)
- C × m × i)
- AC × m × i)
- mi × A × C)

Q24 | In a free vortex motion, the radial component of velocity everywhere is

- Maximum
- Minimum
- Zero
- Nonzero and finite

Q25 | Coefficient of contraction is the ratio of

- Actual velocity of jet at vena contracta to the theoretical velocity
- Loss of head in the orifice to the head of water available at the exit of the orifice
- Loss of head in the orifice to the head of water available at the exit of the orifice
- Area of jet at vena-contracta to the area of orifice