### Fluid Dynamics, What Is Fluid Dynamics, Applications of Fluid Dynamics, Bernoulli equation, Computational Fluid Dynamics.

Immerse yourself in the fascinating world of fluid dynamics at Nokryan.com, where clarity intersects with discovery. Starting with “Fluid Dynamics,” we explore the complex study of fluid motion, encompassing both liquids and gases, to pave the way for further exploration. Seamlessly transitioning to “What Is Fluid Dynamics,” we clarify this area of physics, explaining its range and importance in comprehending natural phenomena and engineering applications. Following that, we examine “Applications of Fluid Dynamics,” demonstrating its varied uses in fields such as aerospace, automotive engineering, and environmental science, emphasizing its practical significance. At Nokryan.com.

1. The viscosity of fluid is described by

None of these- Flowing speed of fluid
- Resistive forces of fluid
- Frictional effect between different layers of a fluid
**correct**

2. Viscosity of ethanol at 30⁰C in Nsm¯²

- 0.954 x 10¯³
- 1.000 x 10¯³
**correct** - 1.012 x 10¯³
- 1.014 x 10¯³

3. Viscosity of water at 30⁰C in Nsm¯²

- 0.711 x 10¯³
- 0.812 x 10¯³
- 0.787 x 10¯³
- 0.801 x 10¯³
**correct**

4. The Bernoulli’s equation is based on the

- Law of conservation of momentum
- Law of conservation of mass
- Law of conservation of energy
**correct** - None of these

5. Substances which flow easily have coefficient of viscosity as

- Very large
- Large
- Very Small
- Small
**correct**

6. The drag force F on a sphere of radius ‘r’ moving slowly with speed V through a fluid of viscosity η by Stake’s law?

- F = 6πηrω
- F = 6πηrv
**correct** - F = πηra
- F = 6πηrav

7. The study of fluids is relatively complicated; this can be simplified by using

- A and B
**correct** - Law of conservation of mass
- Law of conservation of momentum
- Law of conservation of energy

8. At high speeds the force is no longer

- Simply proportional
**correct** - Proportional
- No proportion
- None of these

9. The equation of continuity of fluid is based on the

- Law of conservation of energy
- All of these
- Law of conservation of mass
**correct** - Law of conservation of momentum

10. Even the small viscosity of the air causes a retarding force on car at high speed is

- Large
**correct** - Small
- Very large
- None of these

11. Viscosity of acetone at 30⁰C in Nsm¯²

- 0.295 x 10¯³
**correct** - 0.198 x 10¯³
- 0.301 x 10¯³
- 0.224 x 10¯³

12. A retarding force experienced by an object, when it moves through a liquid is called

- Drag force
**correct** - Restoring force
- Applied force
- All of these

13. Viscosity of methanol at 30⁰C in Nsm¯²

- 0.357 x 10¯³
- 0.369 x 10¯³
- 0.341 x 10¯³
- 0.510 x 10¯³
**correct**

Question was not answered14. Substances which flow easily are

- Petrol
- Kerosene oil
- All of these
**correct** - Water

15. Substances which do not easily flow have coefficient of viscosity as

- Very small
- Large
**correct** - Small
- None of these

16. Substances that don’t flow easily are

- All of these
**correct**

Mobile oil- Thick tar
- Honey

17. Viscosity of plasma at 30⁰C in Nsm¯²

- 1.67 x 10¯³
- 1.595 x 10¯³
- 1.6 x 10¯³
**correct** - 1.96 x 10¯³

18. Viscosity of air at 30⁰C in Nsm¯²

- 0.015 x 10¯³
- 0.151 x 10¯³
- 0.019 x 10¯³
**correct** - 0.0179 x 10¯³

19. Viscosity of water at 30⁰C in Nsm¯²

- 0.594 x 10¯³

0.599 x 10¯³- 0.521 x 10¯³
- 0.564 x 10¯³
**correct**

20. The drag force increases as the speed of the object

- Decreases rapidly
- None of these
- Decreases
- Increases
**correct**

**Entry Test 2021 Physics Fluid Dynamics MCQS Online Preparation Sample Paper 2 Questions with Answer**

1. The expression for the terminal velocity Vt when mass of the droplet is considered is

- Vt = 4grp/9η
- Vt = 4gr²p/9η
**correct** - Vt = 2grp/9η
- Vt = 4gr³p/9η

2. The flow is said to be streamline or laminar when every particle

- Slowly moves in one direction
- None of these
- Moves along the same path as
**correct** - Moves in different direction

3. Every streamline can

- Some what cross each other
- Cross each other
- Not cross each other
**correct** - None of these

4. In equation of continuity, if the fluid is incompressible and the flow is steady, the mass of the fluid is?

- Not conserved
- Some what conserved

None of these- Conserved
**correct**

5. A water hose of internal diameter of 20 mm discharges. 30 kg of water in 60 sec. Calculate speed of water (p for water is 1000 kg m¯³)

- 1.6 ms¯¹
**correct** - 1.8 ms¯¹
- 1.2 ms¯¹
- 2.1 ms¯¹

6. Above a certain velocity the fluid flow, the motion of the fluid becomes

- Steady
- Irregular
- Unsteady
- B and C
**correct**

7. In Bernoulli’s equation, the work done due to fluid is

- W = (P₂ – P₁) ρ /m
- W = (P₁ – P₂) ρ /m
- W = (P₁ – P₂) m/ρ
**correct** - W = (P₂ – P₁) m/ρ

8. If r = 1.0 x 10¯⁴m p = 1000 kgms¯³ η = 19 x 10¯⁶ kgm¯¹ s¯¹ find Vt terminal velocity

- 1.1 ms¯¹
**correct** - 0.12 x 10¯³ ms¯¹
- 1.02 x 10¯³ ms¯¹
- 1.21 ms¯¹

9. At terminal velocity the net force acting on it is

- None of these
- Minimum
- Zero
**correct** - Maximum

10. As the droplet accelerates the net force acting on it is

- None of these
- Zero
- Increase
- Decreases
**correct**

11. When the density is constant for the steady flow of incompressible fluid equation of continuity becomes

- ρ₁ m₁ A₁ V₁= ρ₁ m₁ A₂V₂
- A₁ V₁ = A₂ V₂
**correct** - None of these
- ρ₁ A₁ V₁ = ρ₂ A₂ V₂

12. Viscosity of glycerin at 30⁰C in Nsm¯²

- 6.12x 10¯³
- 6.79x 10¯³
- 6.18x 10¯³
- 6.29x 10¯³
**correct**

13. The expression for the terminal velocity Vt is given by

- Vt = mg/36πη
- Vt = mg/6 πηr
**correct** - Vt= mg/ 6 π²ηr
- Vt = mg/6 πηa

14. The irregular flow of the fluid is called

- Al of these
- Steady flow
- Streamline
- Turbulent flow
**correct**

15. Bernoulli’s equation related to pressure, fluid speed and height which is?

- Fundamental equation
**correct** - Principal equation
- An important equation
- None of these

16. As the droplet accelerates, the upward drag force on it

- Increases
**correct** - Suspended
- None of these
- Decreases

17. When the fluid is incompressible, for which the density is

- Change
- Both
- None of these
- Constant
**correct**

18. In relation Vt = 2gr²p/9η. Terminal velocity is directly proportional to

- r
- None of these
- r²
**correct** - r³

19. In deriving Bernoulli’s equation, it is assumed that the fluid is

- Non-viscous
- In a steady state
- Incompressible
- All of these
**correct**

20. The characteristics of steady flow is

- Streamline
- All of these
**correct** - Incompressible
- Non-viscous

**Entry Test 2021 Physics Fluid Dynamics MCQS Online Preparation Sample Paper 3 Questions with Answer**

1. The relation P₁ – P₂ = ½ ρV₂² shows the

- Venture relation

correct - Bernoulli’s equation
- None of these
- Torricelli’s theorem

2. The viscosity of red blood cells increase than water is from

- 2 to 3 times
- 4 to 5 times
- 3 to 5 times
**correct** - 3 to 4 time

3. The blood pressure inside is greater than the

- None of these
- Both of them
- External atmospheric pressure
**correct** - Internal atmospheric pressure

4. The blood vessels are inflated even in

- None of these
- Relaxed states between heart beat
**correct** - Working state between heart beat
- Occasionally

5. In Torricelli’s theorem, the speed of efflux is equal to

- None of these
- (h₁ – h₂) and falling under gravity
**correct** - Action of gravity
- h₁ – h₂

6. A tall chimney has the advantage/advantages

- Reduce top pressure
- Force
- All of these
**correct** - Upward flow of smoke

7. V₂ = √2g(h₁ – h₂) shows the

- Equation of continuity
- Torricelli’s
**correct** - Bernoulli’s theorem
- None of these

8. Blood vessels are not

- Rigid
**correct** - Flexible
- None of these
- Some times flexible

9. The high blood pressure is known as

- Diastolic
- None of these
- Systolic
**correct** - High blood pressure

10. The venture meter is a device used to measure the fluid

- Speed
**correct** - Temperature
- Quantity
- Pressure

11. Blood is an incompressible fluid having density nearly equal to

- Honey
- None of these
- Milk
- Water
**correct**

12. A car engine is based on the principle of

None of these- Bernoulli’s equation
- Verdure relation
**correct** - Torricelli’s theorem

13. The Bernoulli’s equation often expressed in

- P + ½ ρV + ρgh = constant
- P + ½ ρV² + ρgh = constant
**correct** - P +ρV² + ρgh = constant
- P + ½ ρV² + gh = constant

14. Blood vessels under normal condition are inflate

- None of these
- Occasionally
- All the times
**correct** - Some times

15. A result of the Bernoulli’s equation is that the pressure will be low where the speed of the fluid is

- None of these
- Very high
- Low
- High
**correct**

16. The high blood pressure is

- 130 torr
- 120 torr
**correct** - 110 torr
- 100 torr

17. Applying PA + ½ ρVA² = PB+ ½ ρ VB² where VA = 0.20ms¯¹, VB = 2.0 ms¯¹ ρ = 1000 kgm¯³ and we get (PA – PB) is

- 1999 Nm¯²
- 1750 Nm¯²
- 1980 Nm¯²
**correct** - 1975 Nm¯²

18. When V₁ is approximately zero then Bernoulli’s equation reduces to

- Torricelli’s theorem
**correct** - Venture relation
- Equation of continuity
- None of these

19. A chimney works best when it is

- Exposed to air currents
- Not tall but wide
- A and B
**correct** - Tall

20. The concentration of red blood cells in blood is

- ~ 50 %
**correct** - ~ 40 %
- ~ 30%
- ~ 45 %