**Fluid Mechanics Problems And Solutions**

Get **Fluid Mechanics Problems and Solutions **from here! Fluid Mechanics is a study related to mechanics of fluid, this study area engages with many of the diversified problems. The questions of Fluid Mechanics are asked in many of the competitive examination. Candidates who are searching for Fluid Mechanics Question and Answers (multiple choice questions) can get complete quiz from here! Check out Fluid Mechanics Problems and Solutions by scrolling down the page!

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**Fluid Mechanics Problems and Solutions**

Question 1 According to Archimede’s principle, if a body is immersed partially or fully in a fluid then the buoyancy force is _______ the weight of fluid displaced by the body.

- Equal to
- Less than
- More than
- Unpredictable

Answer: 1

Question 2 Bernoulli’s equation cannot be applied when the flow is

- Rotational
- Turbulent
- Unsteady
- All of the above

Answer: 4

Question 3 Streamline and equipotential lines in a flow field

- Are parallel to each other
- Are identical to each other
- Are perpendicular to each other
- Intersect at acute angles

Answer: 3

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Question 4 What is the normal range of exit cone angle of a venturimeter ?

- 7 to 15
- 15 to 25
- 2 to 5
- >25

Answer: 1

Question 5 What is the correct formula for absolute pressure?

- Pabs = Patm – Pgauge
- Pabs = Pvacuum – Patm
- Pabs = Pvacuum + Patm
- Pabs = Patm+ Pgauge

Answer: 4

Question 6 Relative density of mercury is

- 1
- 8
- 6
- 1000

Answer: 3

Question 7 A Newtonian fluid is defined as the fluid which

- Obeys Hook’s law
- Is compressible
- Obeys Newton’s law of viscosity
- Is incompressible

Answer: 3

Question 8 Most commonly used joint in the underground pipe lines is the

- Expansion joint
- Flange
- Sleevejoint
- Coupling

Answer: 3

Question 9 Bulk modulus is the ratio of

- shear stress to volumetric strain
- volumetric strain to shear stress
- compressive stress to volumetric strain
- volumetric strain to compressive stress

Answer: 3

Question 10 Which type of body is an airfoil?

- Streamline body
- Wave body
- Bluff body
- Induced body

Answer: 1

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Question 11 If the Reynolds number is less than 2000, the flow in a pipe is

- Turbulent
- Laminar
- Transition
- None of the above

Answer: 2

Question 12 A flow is called super-sonic if the

- Velocity of flow is very high
- Discharge is difficult to measure
- Mach number is between 1 and 5
- Mach number is less than 1

Answer: 3

Question 13 The unit of pressure one bar is

- 1 Pascal
- 1 kilo Pascal
- 100 kPascal
- 1000 kPascal

Answer: 3

Question 14 Foot valves provided in pumps are __________ valves.

- Three/four way
- Relief
- Directional control
- Pressure reducing

Answer: 3

Question 15 The component of the total force exerted by fluid on a body in the direction parallel to the direction of motion is called as

- Lift
- Drag
- Both a. And b.
- None of the above

Answer: 2

Question 16 Boundary layer thickness is the distance from the boundary to the point where velocity of the fluid is

- Equal to 10% of free stream velocity
- Equal to 50% of free stream velocity
- Equal to 90% of free stream velocity
- Equal to 99% of free stream velocity

Answer: 4

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Question 17 Reynolds number signifies the ratio of

- Gravity forces top viscous forces
- Inertial forces to viscous forces
- Inertia forces to gravity forces
- Buoyant forces to inertia forces

Answer: 2

Question 18 In pipe flow the critical Reynolds number is about

- 640
- 5 × 105
- 2000
- 64000

Answer: 3

Question 19 Anemometer is used to measure

- Velocity
- Pressure
- Viscosity
- Density

Answer: 1

Question 20 Molten soap mass is transported by a __________ pump.

- Centrifugal
- Gear
- Reciprocating
- Diaphragm

Answer: 2

Question 21 The velocity profile for turbulent flow through a closed conduit is

- Parabolic
- Hyperbolic
- Linear
- Logarithmic

Answer: 4

Question 22 The component of acceleration due to change in the direction of velocity vector is called as

- Direction acceleration
- Tangential acceleration
- Normal acceleration
- Cannot say

Answer: 3

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Question 23 Viscous forces are not present in

- Rotational flow
- Irrotational flow
- Laminar flow
- None of the above

Answer: 2

Question 24 Which acceleration has a nonzero value in uniform flow?

- Local acceleration
- Convective acceleration
- Both local as well as convective acceleration
- Unpredictable

Answer: 1

Question 25 Property of fluid that describes its internal resistance is known as:

- Viscosity
- Friction
- Resistance
- Internal energy

Answer: 1

Question 26 Which fluid does not experience shearing stress during flow?

- Pseudoplastic
- Dilatant
- Newtonian
- Inviscid

Answer: 4

Question 27 Stress strain relationship for Newtonian fluid is

- Parabolic
- Hyperbolic
- Linear
- Inverse type

Answer: 3

Question 28 With increasing flow rate, the hydraulic efficiency of a centrifugal pump

- Remains constant.
- Decreases and then increases.
- Monotonically decreases.
- Increases and then decreases.

Answer: 3

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Question 29 The fluid will rise in capillary when the capillary is placed in fluid, if

- The adhesion force between molecules of fluid and tube is less than the cohesion between liquid molecules
- The adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules
- The adhesion force between molecules of fluid and tube is equal to the cohesion between liquid molecules
- Cannot say

Answer: 2

Question 30 The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.

- Bingham
- Perfect
- Newtonion
- None of these

Answer: 2

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