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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 9

Q1 | The velocity of the liquid flowing through the divergent portion of a Venturimeter

- Remains constant
- Increases
- Decreases
- Depends upon mass of liquid

Q2 | The volumetric change of the fluid caused by a resistance is known as

- Volumetric strain
- Volumetric index
- Compressibility
- Adhesion

Q3 | If the depth of water in an open channel is less than the critical depth, the flow is called

- Critical flow
- Turbulent flow
- Tranquil flow
- Torrential flow

Q4 | Choose the wrong statement

- Fluids are capable of flowing
- Fluids conform to the shape of the containing vessels
- When in equilibrium, fluids cannot sustain tangential forces
- When in equilibrium, fluids can sustain shear forces

Q5 | An orifice is said to be large, if

- The size of orifice is large
- The velocity of flow is large
- The available head of liquid is more than 5 times the height of orifice
- The available head of liquid is less than 5 times the height of orifice

Q6 | A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?

- The metal piece will simply float over the mercury
- The metal piece will be immersed in mercury by half
- Whole of the metal piece will be immersed with its top surface just at mercury level
- Metal piece will sink to the bottom

Q7 | The centre of pressure acts __________ the centre of gravity of immersed surface.

- At
- Above
- Below
- None of these

Q8 | Dynamic viscosity of most of the liquids with rise in temperature

- Increases
- Decreases
- Remain unaffected
- Unpredictable

Q9 | The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

- (8/15) Cd. 2g. H
- (8/15) Cd. 2g. H3/2
- (8/15) Cd. 2g. H²
- (8/15) Cd. 2g. H5/2

Q10 | A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is

- 9,000 kg
- 13,500 kg
- 18,000 kg
- 27,000 kg

Q11 | Select the correct statement

- Local atmospheric pressure depends upon elevation of locality only
- Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
- Local atmospheric pressure is always below standard atmospheric pressure
- A barometer reads the difference between local and standard atmospheric pressure

Q12 | The shear stress-strain graph for a Newtonian fluid is a

- Straight line
- Parabolic curve
- Hyperbolic curve
- Elliptical

Q13 | The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as

- One dimensional flow
- Uniform flow
- Steady flow
- Turbulent flow

Q14 | Uniform flow occurs when

- The direction and magnitude of the velocity at all points are identical
- The velocity of successive fluid particles, at any point, is the same at successive periods of time
- The magnitude and direction of the velocity do not change from point to point in the fluid
- The fluid particles move in plane or parallel planes and the streamline patterns are identical in each pleasure

Q15 | At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

- Minimum
- Maximum
- Zero
- Could be any value

Q16 | The discharge through a channel of trapezoidal section is maximum when

- Width of channel at the top is equal to twice the width at the bottom
- Depth of channel is equal to the width at the bottom
- The sloping side is equal to half the width at the top
- The sloping side is equal to the width at the bottom

Q17 | Piezometer is used to measure

- Pressure in pipe, channels etc.
- Atmospheric pressure
- Very low pressures
- Difference of pressure between two points

Q18 | The point at which the resultant pressure on an immersed surface acts, is known as

- Centre of gravity
- Centre of depth
- Centre of pressure
- Centre of immersed surface

Q19 | Choose the wrong statement

- Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
- Buoyant force is equal to the weight of the liquid displaced
- The point through which buoyant force acts, is called the center of buoyancy
- Center of buoyancy is located above the center of gravity of the displaced liquid

Q20 | The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be

- 2 metres of water column
- 3 metres of water column
- 3.5 metres of water column
- 4 m of water column

Q21 | The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is

- Directly proportional to (radius)2
- Inversely proportional to (radius)2
- Directly proportional to (radius)4
- Inversely proportional to (radius)4

Q22 | The flow which neglects changes in a transverse direction is known as

- One dimensional flow
- Uniform flow
- Steady flow
- Turbulent flow

Q23 | The mass per unit volume of a liquid at a standard temperature and pressure is called

- Specific weight
- Mass density
- Specific gravity
- None of these

Q24 | A large Reynold number is indication of

- Smooth and streamline flow
- Laminar flow
- Steady flow
- Highly turbulent flow

Q25 | Which of the following statement is wrong?

- A flow whose streamline is represented by a curve is called two dimensional flow.
- The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
- The length of divergent portion in a Venturimeter is equal to the convergent portion.
- A pitot tube is used to measure the velocity of flow at the required point in a pipe.