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

Bernoulli’s Principle

Stokes’ Law

Archimedes' Law

Newton’s Second Law

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

Decreases

Becomes zero

Stays constant

Increases

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

Parachute

Water droplet

Smooth steel ball

Iron rod

4. Which quantity becomes constant at terminal velocity?

Mass

Velocity

Momentum

Acceleration

5. 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

6. How does fluid viscosity affect terminal velocity?

Increases it

Has no effect

Makes it infinite

Decreases it

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

Acceleration is constant

Speed keeps increasing

Speed is zero

Acceleration is zero

8. What is the SI unit of drag force?

Newton

Watt

Joule

Pascal

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

Less the drag

Lower the pressure

Greater the drag

More the lift

10. What is terminal velocity?

The speed at which pressure becomes zero

The maximum constant speed of a falling object in a fluid

The speed of sound

The highest speed of a car

11. Which of the following best describes fluid drag?

Upthrust acting downward

Attractive force in liquids

Resistance force exerted by fluid

Force of gravity in fluid

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

Increasing gravitational acceleration

Increasing its mass

Decreasing fluid viscosity

Increasing its surface area

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

It equals the weight

It increases linearly

It becomes zero

It becomes maximum

14. 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 stone thrown upward

A ball rolling on a table

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

Decreasing speed

Increasing surface smoothness

Reducing area

Increasing fluid density

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

Negative

Zero

Equal to weight

Equal to air resistance

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

The relative motion between the object and fluid

Buoyancy

The object’s mass

Gravitational field

18. What causes a skydiver to reach terminal velocity?

Gravity only

Lack of friction

Constant acceleration

Air resistance increasing with speed

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

Object radius

Viscosity

Fluid density

Density of the object

20. The direction of drag force is always:

Along velocity

Opposite to motion

Downward

Perpendicular to motion

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

Greater resistance

Less resistance

Constant acceleration

No change in velocity

22. Which force balances weight at terminal velocity?

Centrifugal force

Electromagnetic force

Normal force

Drag force

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

Normal force

Magnetic force

Gravitational force

Drag force

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

Becomes negative

Decreases

Becomes zero

Increases

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

Becomes zero

Remains constant

Decreases

Increases with square of velocity

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

Volume only

Sound produced

Object’s shape, size, and mass

Color and texture

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

Oil

Air

Honey

Water

28. In which situation is fluid drag negligible?

Skydiver falling

Stone in water

Vacuum

Rain falling

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

Fluid drag

Compression

Friction

Tension

30. Which of the following affects terminal velocity?

Volume only

Shape and surface area

Temperature of the object

Color of the object

31. 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)

32. How does terminal velocity vary with mass?

Constant

Directly proportional

Not related

Inversely proportional

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

Becomes zero

Stays the same

Increases

Decreases

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

Terminal motion

Free motion

Uniform motion

Accelerated motion

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

Steel ball

Wooden cube

Crumpled paper

Feather

36. How is terminal velocity useful in designing parachutes?

Helps reduce upward motion

Helps increase falling speed

Eliminates the effect of gravity

Helps control and limit descent speed

37. Which fluid property affects drag the most?

Color

Odor

Density

Transparency

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

It accelerates downward

It comes to rest

It sinks with constant velocity

It floats

39. Which object is most affected by air resistance?

Plastic ball

Glass marble

Flat sheet of paper

Iron nail

40. How can terminal velocity be increased?

Increase fluid density

Decrease object mass

Increase surface area

Decrease surface area

41. What happens to terminal velocity in a vacuum?

Decreases

Becomes infinite

Does not exist

Increases

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

Directly proportional to velocity

Independent of velocity

Proportional to square of velocity

Inversely proportional to velocity

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

When net force becomes zero

Just before hitting the ground

At maximum height

At the beginning of fall

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

Decreased density

Increased volume

Increased color

Increased mass

45. Terminal velocity occurs when:

Drag force > weight

No force acts on the object

Drag force = weight

Drag force = 0

46. What is drag?

Frictional force exerted by fluids

Upward force acting in vacuum

Centripetal force

Downward force in a solid

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

Less weight

Higher drag to weight ratio

More mass

Stronger gravity

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

Irregular

Spherical

Streamlined

Flat

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

Shape of object

Density of fluid

Color of object

Speed of object

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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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