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

Equal to weight

Equal to air resistance

Zero

Negative

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

Air

Water

Honey

Oil

3. What happens to terminal velocity in a vacuum?

Becomes infinite

Decreases

Does not exist

Increases

4. 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

5. 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)

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

Becomes zero

Decreases

Becomes negative

Increases

7. In which situation is fluid drag negligible?

Stone in water

Rain falling

Skydiver falling

Vacuum

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

Normal force

Gravitational force

Magnetic force

Drag force

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

No change in velocity

Less resistance

Constant acceleration

Greater resistance

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

At maximum height

At the beginning of fall

Just before hitting the ground

When net force becomes zero

11. Which of the following affects terminal velocity?

Color of the object

Shape and surface area

Volume only

Temperature of the object

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

It becomes zero

It increases linearly

It becomes maximum

It equals the weight

13. Which quantity becomes constant at terminal velocity?

Velocity

Momentum

Mass

Acceleration

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

Decreased density

Increased volume

Increased color

Increased mass

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

Viscosity

Fluid density

Object radius

Density of the object

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

Fluid drag

Tension

Friction

Compression

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

Decreases

Becomes zero

Stays constant

Increases

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

A parachutist falling at constant speed

A ball rolling on a table

A stone thrown upward

A car accelerating on a highway

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

Feather

Wooden cube

Steel ball

Crumpled paper

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

Decreases

Becomes zero

Increases

Stays the same

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

Irregular

Flat

Streamlined

Spherical

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

Increasing gravitational acceleration

Increasing its mass

Increasing its surface area

Decreasing fluid viscosity

23. Which of the following best describes fluid drag?

Resistance force exerted by fluid

Upthrust acting downward

Force of gravity in fluid

Attractive force in liquids

24. Which fluid property affects drag the most?

Density

Odor

Color

Transparency

25. Terminal velocity occurs when:

Drag force > weight

Drag force = weight

Drag force = 0

No force acts on the object

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26. How does terminal velocity vary with mass?

Constant

Inversely proportional

Not related

Directly proportional

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

Shape of object

Density of fluid

Color of object

Speed of object

28. 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

29. Which force balances weight at terminal velocity?

Centrifugal force

Normal force

Electromagnetic force

Drag force

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

It sinks with constant velocity

It accelerates downward

It comes to rest

It floats

31. What is drag?

Downward force in a solid

Centripetal force

Frictional force exerted by fluids

Upward force acting in vacuum

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

Remains constant

Increases with square of velocity

Decreases

Becomes zero

33. How can terminal velocity be increased?

Decrease object mass

Increase fluid density

Decrease surface area

Increase surface area

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

Less the drag

More the lift

Greater the drag

Lower the pressure

35. How does fluid viscosity affect terminal velocity?

Increases it

Makes it infinite

Decreases it

Has no effect

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

Bernoulli’s Principle

Newton’s Second Law

Stokes’ Law

Archimedes' Law

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

Directly proportional to velocity

Independent of velocity

Inversely proportional to velocity

Proportional to square of velocity

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

Parachute

Smooth steel ball

Iron rod

Water droplet

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

Speed keeps increasing

Speed is zero

Acceleration is zero

Acceleration is constant

40. What causes a skydiver to reach terminal velocity?

Constant acceleration

Air resistance increasing with speed

Gravity only

Lack of friction

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

Buoyancy

Gravitational field

The object’s mass

The relative motion between the object and fluid

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

It always acts opposite to motion

It depends on velocity

It increases when mass increases

It is absent in a vacuum

43. The direction of drag force is always:

Opposite to motion

Along velocity

Perpendicular to motion

Downward

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

Increasing surface smoothness

Increasing fluid density

Decreasing speed

Reducing area

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

Uniform motion

Terminal motion

Free motion

Accelerated motion

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

Sound produced

Volume only

Object’s shape, size, and mass

Color and texture

47. What is the SI unit of drag force?

Newton

Joule

Pascal

Watt

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

Stronger gravity

Higher drag to weight ratio

More mass

Less weight

49. Which object is most affected by air resistance?

Glass marble

Plastic ball

Iron nail

Flat sheet of paper

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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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