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 %