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

Spherical

Flat

Streamlined

Irregular

2. Which force balances weight at terminal velocity?

Normal force

Drag force

Centrifugal force

Electromagnetic force

3. 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

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

The relative motion between the object and fluid

Gravitational field

The object’s mass

Buoyancy

5. Which of the following affects terminal velocity?

Temperature of the object

Volume only

Color of the object

Shape and surface area

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

Object radius

Density of the object

Viscosity

Fluid density

7. How does fluid viscosity affect terminal velocity?

Increases it

Has no effect

Decreases it

Makes it infinite

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

It is absent in a vacuum

It depends on velocity

It always acts opposite to motion

It increases when mass increases

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

Bernoulli’s Principle

Stokes’ Law

Archimedes' Law

Newton’s Second Law

10. 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

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

Decreases

Becomes zero

Increases with square of velocity

Remains constant

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

At the beginning of fall

At maximum height

Just before hitting the ground

When net force becomes zero

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

Less weight

Higher drag to weight ratio

More mass

Stronger gravity

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

Increases

Stays constant

Decreases

Becomes zero

15. How is terminal velocity useful in designing parachutes?

Helps control and limit descent speed

Helps reduce upward motion

Helps increase falling speed

Eliminates the effect of gravity

16. What is the SI unit of drag force?

Joule

Watt

Newton

Pascal

17. 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)

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

Less the drag

Greater the drag

More the lift

Lower the pressure

19. In which situation is fluid drag negligible?

Rain falling

Vacuum

Stone in water

Skydiver falling

20. Terminal velocity occurs when:

No force acts on the object

Drag force = 0

Drag force = weight

Drag force > weight

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

Speed of object

Color of object

Shape of object

Density of fluid

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

No change in velocity

Less resistance

Greater resistance

Constant acceleration

23. Which quantity becomes constant at terminal velocity?

Acceleration

Momentum

Velocity

Mass

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

It floats

It sinks with constant velocity

It accelerates downward

It comes to rest

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

Increased mass

Increased volume

Increased color

Decreased density

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26. What is drag?

Centripetal force

Frictional force exerted by fluids

Downward force in a solid

Upward force acting in vacuum

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

Acceleration is constant

Speed is zero

Speed keeps increasing

Acceleration is zero

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

Zero

Negative

Equal to weight

Equal to air resistance

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

Water droplet

Iron rod

Parachute

Smooth steel ball

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

Decreases

Increases

Becomes zero

Becomes negative

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

Increasing its mass

Increasing gravitational acceleration

Increasing its surface area

Decreasing fluid viscosity

32. Which fluid property affects drag the most?

Odor

Color

Density

Transparency

33. 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

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

Fluid drag

Friction

Tension

Compression

35. The direction of drag force is always:

Opposite to motion

Perpendicular to motion

Along velocity

Downward

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

Decreases

Stays the same

Increases

Becomes zero

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

Air

Water

Honey

Oil

38. How can terminal velocity be increased?

Increase surface area

Increase fluid density

Decrease object mass

Decrease surface area

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

A car accelerating on a highway

A stone thrown upward

A ball rolling on a table

A parachutist falling at constant speed

40. What happens to terminal velocity in a vacuum?

Increases

Decreases

Becomes infinite

Does not exist

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

Object’s shape, size, and mass

Volume only

Color and texture

Sound produced

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

Steel ball

Feather

Wooden cube

Crumpled paper

43. How does terminal velocity vary with mass?

Directly proportional

Inversely proportional

Constant

Not related

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

Inversely proportional to velocity

Directly proportional to velocity

Proportional to square of velocity

Independent of velocity

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

Gravitational force

Normal force

Drag force

Magnetic force

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

Free motion

Accelerated motion

Uniform motion

Terminal motion

47. Which object is most affected by air resistance?

Glass marble

Flat sheet of paper

Iron nail

Plastic ball

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

Increasing fluid density

Decreasing speed

Reducing area

Increasing surface smoothness

49. What causes a skydiver to reach terminal velocity?

Lack of friction

Air resistance increasing with speed

Gravity only

Constant acceleration

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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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