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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 the SI unit of drag force?

Joule

Watt

Pascal

Newton

2. In which situation is fluid drag negligible?

Rain falling

Vacuum

Stone in water

Skydiver falling

3. Which force balances weight at terminal velocity?

Electromagnetic force

Centrifugal force

Drag force

Normal force

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

Speed of object

Color of object

Density of fluid

Shape of object

5. How does terminal velocity vary with mass?

Directly proportional

Not related

Inversely proportional

Constant

6. Which object is most affected by air resistance?

Iron nail

Glass marble

Flat sheet of paper

Plastic ball

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

Object’s shape, size, and mass

Sound produced

Color and texture

Volume only

8. How can terminal velocity be increased?

Decrease object mass

Increase surface area

Decrease surface area

Increase fluid density

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

Increasing gravitational acceleration

Decreasing fluid viscosity

Increasing its mass

Increasing its surface area

10. Which of the following affects terminal velocity?

Volume only

Temperature of the object

Color of the object

Shape and surface area

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

Lower the pressure

More the lift

Greater the drag

Less the drag

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

Becomes zero

Increases with square of velocity

Remains constant

Decreases

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

Parachute

Smooth steel ball

Iron rod

Water droplet

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

Buoyancy

The object’s mass

Gravitational field

The relative motion between the object and fluid

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

When net force becomes zero

At maximum height

At the beginning of fall

Just before hitting the ground

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

Decreases

Increases

Becomes zero

Stays the same

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

Tension

Fluid drag

Friction

Compression

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

Equal to weight

Equal to air resistance

Zero

Negative

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

Increasing fluid density

Decreasing speed

Reducing area

Increasing surface smoothness

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

vₜ = ηg/ρ

vₜ = (rη)/(2ρg)

vₜ = mg/r²

vₜ = (2r²g(ρ - σ)) / 9η

21. Which fluid property affects drag the most?

Transparency

Color

Density

Odor

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

Gravitational force

Normal force

Drag force

Magnetic force

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

It comes to rest

It sinks with constant velocity

It accelerates downward

It floats

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

Inversely proportional to velocity

Directly proportional to velocity

Independent of velocity

Proportional to square of velocity

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

Newton’s Second Law

Archimedes' Law

Bernoulli’s Principle

Stokes’ Law

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

Constant acceleration

Greater resistance

No change in velocity

Less resistance

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

Uniform motion

Terminal motion

Accelerated motion

Free motion

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

Feather

Steel ball

Crumpled paper

Wooden cube

29. How is terminal velocity useful in designing parachutes?

Helps reduce upward motion

Helps control and limit descent speed

Helps increase falling speed

Eliminates the effect of gravity

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

Decreases

Increases

Becomes zero

Stays constant

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

It depends on velocity

It is absent in a vacuum

It increases when mass increases

It always acts opposite to motion

32. 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

33. How does fluid viscosity affect terminal velocity?

Decreases it

Has no effect

Increases it

Makes it infinite

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

Object radius

Fluid density

Density of the object

Viscosity

35. What causes a skydiver to reach terminal velocity?

Gravity only

Lack of friction

Constant acceleration

Air resistance increasing with speed

36. What is drag?

Centripetal force

Upward force acting in vacuum

Frictional force exerted by fluids

Downward force in a solid

37. Which quantity becomes constant at terminal velocity?

Momentum

Acceleration

Mass

Velocity

38. What happens to terminal velocity in a vacuum?

Decreases

Increases

Becomes infinite

Does not exist

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

Water

Air

Honey

Oil

40. The direction of drag force is always:

Opposite to motion

Along velocity

Downward

Perpendicular to motion

41. Terminal velocity occurs when:

Drag force = weight

No force acts on the object

Drag force = 0

Drag force > weight

42. Which of the following best describes fluid drag?

Resistance force exerted by fluid

Attractive force in liquids

Upthrust acting downward

Force of gravity in fluid

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

Speed is zero

Acceleration is zero

Speed keeps increasing

Acceleration is constant

44. What is terminal velocity?

The speed at which pressure becomes zero

The highest speed of a car

The maximum constant speed of a falling object in a fluid

The speed of sound

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

A stone thrown upward

A car accelerating on a highway

A ball rolling on a table

A parachutist falling at constant speed

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

Less weight

Stronger gravity

Higher drag to weight ratio

More mass

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

Spherical

Irregular

Flat

Streamlined

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

Increased volume

Decreased density

Increased mass

Increased color

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

Becomes negative

Decreases

Increases

Becomes zero

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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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