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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 causes a skydiver to reach terminal velocity?

Constant acceleration

Gravity only

Air resistance increasing with speed

Lack of friction

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

Equal to weight

Negative

Equal to air resistance

Zero

3. Which force balances weight at terminal velocity?

Centrifugal force

Electromagnetic force

Drag force

Normal force

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

More mass

Higher drag to weight ratio

Stronger gravity

Less weight

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

Viscosity

Density of the object

Fluid density

Object radius

6. What is the SI unit of drag force?

Pascal

Newton

Watt

Joule

7. Which of the following best describes fluid drag?

Upthrust acting downward

Resistance force exerted by fluid

Attractive force in liquids

Force of gravity in fluid

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

Increasing surface smoothness

Reducing area

Decreasing speed

Increasing fluid density

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

Increased volume

Decreased density

Increased mass

Increased color

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

Spherical

Streamlined

Irregular

Flat

11. The direction of drag force is always:

Opposite to motion

Perpendicular to motion

Along velocity

Downward

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

Archimedes' Law

Bernoulli’s Principle

Stokes’ Law

Newton’s Second Law

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

Uniform motion

Terminal motion

Accelerated motion

Free motion

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

Greater the drag

Less the drag

Lower the pressure

More the lift

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

Buoyancy

The relative motion between the object and fluid

Gravitational field

The object’s mass

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

Compression

Friction

Fluid drag

Tension

17. Which of the following affects terminal velocity?

Volume only

Shape and surface area

Temperature of the object

Color of the object

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

It comes to rest

It floats

It sinks with constant velocity

It accelerates downward

19. 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

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

Greater resistance

Less resistance

No change in velocity

Constant acceleration

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

Directly proportional to velocity

Proportional to square of velocity

Inversely proportional to velocity

Independent of velocity

22. Which quantity becomes constant at terminal velocity?

Momentum

Acceleration

Velocity

Mass

23. What happens to terminal velocity in a vacuum?

Increases

Decreases

Becomes infinite

Does not exist

24. How can terminal velocity be increased?

Decrease surface area

Decrease object mass

Increase fluid density

Increase surface area

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

It becomes maximum

It equals the weight

It becomes zero

It increases linearly

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

Smooth steel ball

Parachute

Iron rod

Water droplet

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

A ball rolling on a table

A parachutist falling at constant speed

A car accelerating on a highway

A stone thrown upward

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

Speed keeps increasing

Speed is zero

Acceleration is constant

Acceleration is zero

29. What is terminal velocity?

The speed at which pressure becomes zero

The highest speed of a car

The speed of sound

The maximum constant speed of a falling object in a fluid

30. How does fluid viscosity affect terminal velocity?

Increases it

Has no effect

Decreases it

Makes it infinite

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

Increases

Decreases

Becomes zero

Becomes negative

32. Which object is most affected by air resistance?

Glass marble

Iron nail

Flat sheet of paper

Plastic ball

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

vₜ = (2r²g(ρ - σ)) / 9η

vₜ = (rη)/(2ρg)

vₜ = mg/r²

vₜ = ηg/ρ

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

Water

Oil

Honey

Air

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

Decreases

Becomes zero

Stays constant

Increases

36. What is drag?

Centripetal force

Frictional force exerted by fluids

Downward force in a solid

Upward force acting in vacuum

37. Terminal velocity occurs when:

Drag force = 0

Drag force = weight

Drag force > weight

No force acts on the object

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

Normal force

Magnetic force

Drag force

Gravitational force

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

Sound produced

Object’s shape, size, and mass

Volume only

Color and texture

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

Crumpled paper

Wooden cube

Steel ball

Feather

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

Color of object

Speed of object

Density of fluid

Shape of object

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

Stays the same

Increases

Decreases

Becomes zero

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

Increasing its surface area

Increasing gravitational acceleration

Increasing its mass

Decreasing fluid viscosity

44. In which situation is fluid drag negligible?

Rain falling

Stone in water

Vacuum

Skydiver falling

45. How does terminal velocity vary with mass?

Inversely proportional

Not related

Constant

Directly proportional

46. Which fluid property affects drag the most?

Odor

Transparency

Color

Density

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

Decreases

Increases with square of velocity

Becomes zero

Remains constant

48. How is terminal velocity useful in designing parachutes?

Helps control and limit descent speed

Eliminates the effect of gravity

Helps increase falling speed

Helps reduce upward motion

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

When net force becomes zero

At the beginning of fall

Just before hitting the ground

At maximum height

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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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