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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. 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

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

Streamlined

Irregular

Spherical

Flat

3. 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

4. What is the SI unit of drag force?

Newton

Pascal

Joule

Watt

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

More the lift

Greater the drag

Lower the pressure

Less the drag

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

It is absent in a vacuum

It always acts opposite to motion

It increases when mass increases

It depends on velocity

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

Increasing gravitational acceleration

Decreasing fluid viscosity

Increasing its surface area

Increasing its mass

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

Color of object

Shape of object

Speed of object

Density of fluid

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

Becomes zero

Increases

Becomes negative

Decreases

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

Reducing area

Increasing fluid density

Decreasing speed

Increasing surface smoothness

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

Archimedes' Law

Bernoulli’s Principle

Stokes’ Law

Newton’s Second Law

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

Just before hitting the ground

At maximum height

When net force becomes zero

At the beginning of fall

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

Gravitational force

Drag force

Normal force

Magnetic force

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

It becomes maximum

It equals the weight

It increases linearly

It becomes zero

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

Less resistance

No change in velocity

Greater resistance

Constant acceleration

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

It accelerates downward

It comes to rest

It floats

It sinks with constant velocity

17. What is terminal velocity?

The speed of sound

The speed at which pressure becomes zero

The maximum constant speed of a falling object in a fluid

The highest speed of a car

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

Decreases

Increases

Stays the same

Becomes zero

19. Which of the following affects terminal velocity?

Color of the object

Volume only

Shape and surface area

Temperature of the object

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

Increases with square of velocity

Remains constant

Becomes zero

Decreases

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

Viscosity

Object radius

Density of the object

Fluid density

22. Which force balances weight at terminal velocity?

Drag force

Electromagnetic force

Centrifugal force

Normal force

23. How can terminal velocity be increased?

Decrease object mass

Increase surface area

Increase fluid density

Decrease surface area

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

Wooden cube

Feather

Steel ball

Crumpled paper

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

Iron rod

Parachute

Smooth steel ball

Water droplet

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

Inversely proportional to velocity

Independent of velocity

Proportional to square of velocity

Directly proportional to velocity

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

Free motion

Accelerated motion

Terminal motion

Uniform motion

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

Stays constant

Becomes zero

Increases

Decreases

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

More mass

Higher drag to weight ratio

Stronger gravity

Less weight

30. Which of the following best describes fluid drag?

Force of gravity in fluid

Attractive force in liquids

Resistance force exerted by fluid

Upthrust acting downward

31. In which situation is fluid drag negligible?

Vacuum

Rain falling

Stone in water

Skydiver falling

32. Terminal velocity occurs when:

Drag force = weight

Drag force > weight

Drag force = 0

No force acts on the object

33. Which fluid property affects drag the most?

Transparency

Color

Density

Odor

34. How does fluid viscosity affect terminal velocity?

Has no effect

Makes it infinite

Increases it

Decreases it

35. What happens to terminal velocity in a vacuum?

Increases

Becomes infinite

Does not exist

Decreases

36. Which object is most affected by air resistance?

Iron nail

Glass marble

Flat sheet of paper

Plastic ball

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

Increased mass

Increased volume

Increased color

Decreased density

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

vₜ = ηg/ρ

vₜ = (2r²g(ρ - σ)) / 9η

vₜ = mg/r²

vₜ = (rη)/(2ρg)

39. What causes a skydiver to reach terminal velocity?

Lack of friction

Constant acceleration

Air resistance increasing with speed

Gravity only

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

Equal to weight

Zero

Negative

Equal to air resistance

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

Acceleration is zero

Acceleration is constant

Speed keeps increasing

Speed is zero

42. The direction of drag force is always:

Along velocity

Perpendicular to motion

Downward

Opposite to motion

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

Air

Honey

Oil

Water

44. Which quantity becomes constant at terminal velocity?

Velocity

Mass

Acceleration

Momentum

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

Sound produced

Object’s shape, size, and mass

Volume only

Color and texture

46. How does terminal velocity vary with mass?

Directly proportional

Constant

Not related

Inversely proportional

47. What is drag?

Centripetal force

Frictional force exerted by fluids

Downward force in a solid

Upward force acting in vacuum

48. 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 stone thrown upward

A car accelerating on a highway

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

Tension

Compression

Fluid drag

Friction

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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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