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Physics Fluid Dynamics Online Mcqs Test

Mustansar KhanLast Updated: October 13, 2025

Important Fluid Dynamics Question and Answer

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Fluid Dynamics Practice Test Online With Explanation

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1. What is terminal velocity?

The highest speed of a car

The maximum constant speed of a falling object in a fluid

The speed at which pressure becomes zero

The speed of sound

2. How does fluid viscosity affect terminal velocity?

Has no effect

Increases it

Decreases it

Makes it infinite

3. Which object would reach terminal velocity the quickest when dropped from the same height?

Crumpled paper

Feather

Steel ball

Wooden cube

4. What is the terminal velocity of an object dependent on?

Object’s shape, size, and mass

Volume only

Color and texture

Sound produced

5. Which of the following best represents a real-world example of terminal velocity?

A parachutist falling at constant speed

A car accelerating on a highway

A ball rolling on a table

A stone thrown upward

6. Which force opposes the motion of an object moving through a fluid?

Gravitational force

Drag force

Normal force

Magnetic force

7. The drag force acting on an object is caused by:

The relative motion between the object and fluid

Buoyancy

Gravitational field

The object’s mass

8. Which of the following factors increases drag on a moving object?

Decreasing speed

Increasing surface smoothness

Increasing fluid density

Reducing area

9. Which of the following best describes fluid drag?

Attractive force in liquids

Upthrust acting downward

Resistance force exerted by fluid

Force of gravity in fluid

10. What happens to acceleration after terminal velocity is reached?

Becomes negative

Increases

Becomes zero

Decreases

11. If mass increases but surface area remains constant, terminal velocity:

Stays constant

Increases

Becomes zero

Decreases

12. Which of the following is not a factor in determining fluid drag?

Speed of object

Shape of object

Density of fluid

Color of object

13. Which factor will decrease the terminal velocity of a falling object?

Increasing its mass

Increasing gravitational acceleration

Decreasing fluid viscosity

Increasing its surface area

14. How does terminal velocity vary with mass?

Directly proportional

Inversely proportional

Not related

Constant

15. Which force balances weight at terminal velocity?

Electromagnetic force

Drag force

Normal force

Centrifugal force

16. Which quantity becomes constant at terminal velocity?

Mass

Momentum

Velocity

Acceleration

17. What causes a skydiver to reach terminal velocity?

Air resistance increasing with speed

Gravity only

Constant acceleration

Lack of friction

18. How does an object behave in fluid if drag force is less than weight?

It accelerates downward

It comes to rest

It sinks with constant velocity

It floats

19. Which of the following affects terminal velocity?

Shape and surface area

Volume only

Temperature of the object

Color of the object

20. What does a higher viscosity fluid mean for an object falling through it?

Less resistance

No change in velocity

Constant acceleration

Greater resistance

21. Which of the following objects will have the lowest terminal velocity?

Water droplet

Parachute

Smooth steel ball

Iron rod

22. The net force on an object falling at terminal velocity is:

Equal to air resistance

Zero

Equal to weight

Negative

23. What does ‘ρ’ represent in Stokes' Law?

Viscosity

Fluid density

Object radius

Density of the object

24. What happens to the net force on an object at terminal velocity?

It increases linearly

It becomes maximum

It equals the weight

It becomes zero

25. Which fluid property affects drag the most?

Density

Color

Odor

Transparency

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26. Terminal velocity occurs when:

Drag force = weight

No force acts on the object

Drag force = 0

Drag force > weight

27. The faster an object moves through a fluid, the:

More the lift

Lower the pressure

Greater the drag

Less the drag

28. What is the shape of an object that experiences minimum drag?

Spherical

Streamlined

Irregular

Flat

29. Which term refers to the force opposing motion through water?

Compression

Fluid drag

Tension

Friction

30. In which fluid will a ball fall with the lowest terminal velocity?

Oil

Honey

Air

Water

31. Which law explains the viscous drag on small spheres in a fluid?

Newton’s Second Law

Bernoulli’s Principle

Stokes’ Law

Archimedes' Law

32. In which situation is fluid drag negligible?

Rain falling

Vacuum

Stone in water

Skydiver falling

33. Which of the following increases both buoyant force and drag?

Increased volume

Decreased density

Increased color

Increased mass

34. Which of the following is an incorrect statement about fluid drag?

It increases when mass increases

It always acts opposite to motion

It depends on velocity

It is absent in a vacuum

35. What happens to drag force as velocity increases in turbulent flow?

Decreases

Remains constant

Becomes zero

Increases with square of velocity

36. Why does a feather fall slower than a stone?

Stronger gravity

Less weight

Higher drag to weight ratio

More mass

37. The direction of drag force is always:

Downward

Along velocity

Opposite to motion

Perpendicular to motion

38. Which object is most affected by air resistance?

Plastic ball

Iron nail

Flat sheet of paper

Glass marble

39. At what point does an object stop accelerating during free fall?

At maximum height

At the beginning of fall

When net force becomes zero

Just before hitting the ground

40. Which term describes motion at constant velocity through a fluid?

Accelerated motion

Terminal motion

Free motion

Uniform motion

41. What is the SI unit of drag force?

Joule

Pascal

Newton

Watt

42. Which of these equations best expresses terminal velocity (vₜ) under Stokes’ law for a sphere?

vₜ = mg/r²

vₜ = ηg/ρ

vₜ = (2r²g(ρ - σ)) / 9η

vₜ = (rη)/(2ρg)

43. If a skydiver opens their parachute, what happens to their terminal velocity?

Increases

Stays the same

Becomes zero

Decreases

44. How can terminal velocity be increased?

Decrease object mass

Decrease surface area

Increase surface area

Increase fluid density

45. What is drag?

Upward force acting in vacuum

Frictional force exerted by fluids

Centripetal force

Downward force in a solid

46. What is the relation between drag force and velocity for a spherical object in laminar flow?

Inversely proportional to velocity

Independent of velocity

Directly proportional to velocity

Proportional to square of velocity

47. At terminal velocity, which of the following is true?

Acceleration is zero

Speed keeps increasing

Acceleration is constant

Speed is zero

48. What happens to terminal velocity in a vacuum?

Decreases

Increases

Does not exist

Becomes infinite

49. How is terminal velocity useful in designing parachutes?

Helps increase falling speed

Helps reduce upward motion

Eliminates the effect of gravity

Helps control and limit descent speed

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Mustansar KhanLast Updated: October 13, 2025

Physics Fluid Dynamics Online Mcqs Test

Important Fluid Dynamics Question and Answer

Physics Fluid Dynamics Practice Test Online With Explanation

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