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MDCAT Physics Fluid Dynamics Test Online

Mustansar KhanLast Updated: June 16, 2025

Physics Fluid Dynamics MCQS Online Test

MDCAT Physics Fluid Dynamics Chapter Online Test

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

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

Increased mass

Increased volume

Decreased density

Increased color

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

Spherical

Streamlined

Irregular

Flat

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

Speed of object

Color of object

Density of fluid

Shape of object

4. What is drag?

Frictional force exerted by fluids

Downward force in a solid

Upward force acting in vacuum

Centripetal force

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

Increasing gravitational acceleration

Increasing its surface area

Increasing its mass

Decreasing fluid viscosity

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

Accelerated motion

Uniform motion

Free motion

Terminal motion

7. Which of the following affects terminal velocity?

Color of the object

Shape and surface area

Temperature of the object

Volume only

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

Object’s shape, size, and mass

Sound produced

Color and texture

Volume only

9. In which situation is fluid drag negligible?

Vacuum

Rain falling

Stone in water

Skydiver falling

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

Iron rod

Water droplet

Smooth steel ball

Parachute

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

Equal to weight

Zero

Equal to air resistance

Negative

12. Which fluid property affects drag the most?

Density

Odor

Color

Transparency

13. How does terminal velocity vary with mass?

Inversely proportional

Directly proportional

Constant

Not related

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

Gravitational field

The relative motion between the object and fluid

Buoyancy

The object’s mass

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

Becomes zero

Increases

Decreases

Stays the same

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

It always acts opposite to motion

It increases when mass increases

It depends on velocity

It is absent in a vacuum

17. Which of the following best describes fluid drag?

Upthrust acting downward

Force of gravity in fluid

Attractive force in liquids

Resistance force exerted by fluid

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

Reducing area

Increasing fluid density

Decreasing speed

Increasing surface smoothness

19. What happens to terminal velocity in a vacuum?

Becomes infinite

Does not exist

Decreases

Increases

20. How does fluid viscosity affect terminal velocity?

Decreases it

Increases it

Makes it infinite

Has no effect

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

Increases with square of velocity

Remains constant

Decreases

Becomes zero

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

Feather

Crumpled paper

Wooden cube

Steel ball

23. Which quantity becomes constant at terminal velocity?

Velocity

Mass

Acceleration

Momentum

24. What is terminal velocity?

The highest speed of a car

The speed of sound

The speed at which pressure becomes zero

The maximum constant speed of a falling object in a fluid

25. Which force balances weight at terminal velocity?

Normal force

Drag force

Centrifugal force

Electromagnetic force

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26. 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

27. How is terminal velocity useful in designing parachutes?

Helps control and limit descent speed

Helps increase falling speed

Eliminates the effect of gravity

Helps reduce upward motion

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

Speed keeps increasing

Speed is zero

Acceleration is zero

Acceleration is constant

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

It comes to rest

It floats

It accelerates downward

It sinks with constant velocity

30. What is the SI unit of drag force?

Watt

Pascal

Newton

Joule

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

Oil

Water

Air

Honey

32. The direction of drag force is always:

Perpendicular to motion

Opposite to motion

Downward

Along velocity

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

Becomes zero

Increases

Decreases

Becomes negative

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

Newton’s Second Law

Stokes’ Law

Bernoulli’s Principle

Archimedes' Law

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

Friction

Tension

Compression

Fluid drag

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

Stays constant

Becomes zero

Increases

Decreases

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

Greater resistance

No change in velocity

Constant acceleration

Less resistance

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

More mass

Higher drag to weight ratio

Less weight

Stronger gravity

39. Which object is most affected by air resistance?

Flat sheet of paper

Glass marble

Plastic ball

Iron nail

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

Normal force

Gravitational force

Magnetic force

Drag force

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

At maximum height

Just before hitting the ground

When net force becomes zero

At the beginning of fall

42. What causes a skydiver to reach terminal velocity?

Air resistance increasing with speed

Constant acceleration

Gravity only

Lack of friction

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

It increases linearly

It equals the weight

It becomes zero

It becomes maximum

44. Terminal velocity occurs when:

Drag force = 0

Drag force = weight

Drag force > weight

No force acts on the object

45. How can terminal velocity be increased?

Increase fluid density

Decrease object mass

Increase surface area

Decrease surface area

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

Object radius

Viscosity

Fluid density

Density of the object

47. 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

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

vₜ = (rη)/(2ρg)

vₜ = (2r²g(ρ - σ)) / 9η

vₜ = ηg/ρ

vₜ = mg/r²

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

More the lift

Lower the pressure

Less the drag

Greater the drag

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Mustansar KhanLast Updated: June 16, 2025

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MDCAT Physics Fluid Dynamics Test Online

Physics Fluid Dynamics MCQS Online Test

MDCAT Physics Fluid Dynamics Chapter Online Test

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Physics Fluid Dynamics MCQS Online Test

MDCAT Physics Fluid Dynamics Chapter Online Test

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Mustansar Khan

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