Physics Fluid Dynamics Online Mcqs Test

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Question 1

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

Answer

vₜ = ηg/ρ

Answer

vₜ = (2r²g(ρ - σ)) / 9η

Answer

vₜ = (rη)/(2ρg)

Answer

vₜ = mg/r²

Question 2

2. How can terminal velocity be increased?

Answer

Increase fluid density

Answer

Increase surface area

Answer

Decrease surface area

Answer

Decrease object mass

Question 3

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

Answer

The relative motion between the object and fluid

Answer

The object’s mass

Answer

Gravitational field

Question 4

4. How is terminal velocity useful in designing parachutes?

Answer

Helps increase falling speed

Answer

Eliminates the effect of gravity

Answer

Helps control and limit descent speed

Answer

Helps reduce upward motion

Question 5

5. Which quantity becomes constant at terminal velocity?

Answer

Acceleration

Question 6

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

Answer

Shape of object

Answer

Density of fluid

Answer

Color of object

Answer

Speed of object

Question 7

7. Terminal velocity occurs when:

Answer

Drag force > weight

Answer

Drag force = weight

Answer

No force acts on the object

Answer

Drag force = 0

Question 8

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

Answer

Lower the pressure

Answer

Less the drag

Answer

Greater the drag

Answer

More the lift

Question 9

9. Which of the following best describes fluid drag?

Answer

Force of gravity in fluid

Answer

Attractive force in liquids

Answer

Resistance force exerted by fluid

Answer

Upthrust acting downward

Question 10

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

Question 11

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

Answer

It is absent in a vacuum

Answer

It increases when mass increases

Answer

It depends on velocity

Answer

It always acts opposite to motion

Question 12

12. What causes a skydiver to reach terminal velocity?

Answer

Constant acceleration

Answer

Gravity only

Answer

Air resistance increasing with speed

Answer

Lack of friction

Question 13

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

Answer

Stays constant

Answer

Becomes zero

Question 14

14. What is the SI unit of drag force?

Question 15

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

Answer

Remains constant

Answer

Becomes zero

Answer

Increases with square of velocity

Question 16

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

Answer

Accelerated motion

Answer

Uniform motion

Answer

Free motion

Answer

Terminal motion

Question 17

17. Which object is most affected by air resistance?

Answer

Glass marble

Answer

Flat sheet of paper

Answer

Plastic ball

Question 18

18. What is drag?

Answer

Centripetal force

Answer

Frictional force exerted by fluids

Answer

Upward force acting in vacuum

Answer

Downward force in a solid

Question 19

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

Answer

Increased mass

Answer

Increased volume

Answer

Decreased density

Answer

Increased color

Question 20

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

Answer

Compression

Answer

Fluid drag

Question 21

21. Which fluid property affects drag the most?

Answer

Transparency

Question 22

22. Which of the following affects terminal velocity?

Answer

Color of the object

Answer

Shape and surface area

Answer

Volume only

Answer

Temperature of the object

Question 23

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

Answer

Volume only

Answer

Object’s shape, size, and mass

Answer

Sound produced

Answer

Color and texture

Question 24

24. What is terminal velocity?

Answer

The highest speed of a car

Answer

The speed of sound

Answer

The maximum constant speed of a falling object in a fluid

Answer

The speed at which pressure becomes zero

Question 25

25. What happens to terminal velocity in a vacuum?

Answer

Does not exist

Answer

Becomes infinite

Question 26

26. The direction of drag force is always:

Answer

Opposite to motion

Answer

Along velocity

Answer

Perpendicular to motion

Question 27

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

Answer

Drag force

Answer

Gravitational force

Answer

Normal force

Answer

Magnetic force

Question 28

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

Answer

Density of the object

Answer

Fluid density

Answer

Object radius

Question 29

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

Answer

Higher drag to weight ratio

Answer

Stronger gravity

Answer

Less weight

Question 30

30. How does fluid viscosity affect terminal velocity?

Answer

Has no effect

Answer

Increases it

Answer

Decreases it

Answer

Makes it infinite

Question 31

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

Answer

Stays the same

Answer

Becomes zero

Question 32

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

Answer

Greater resistance

Answer

Less resistance

Answer

Constant acceleration

Answer

No change in velocity

Question 33

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

Answer

Decreasing speed

Answer

Increasing surface smoothness

Answer

Reducing area

Answer

Increasing fluid density

Question 34

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

Answer

It sinks with constant velocity

Answer

It accelerates downward

Answer

It comes to rest

Question 35

35. Which force balances weight at terminal velocity?

Answer

Drag force

Answer

Centrifugal force

Answer

Normal force

Answer

Electromagnetic force

Question 36

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

Answer

Crumpled paper

Answer

Steel ball

Answer

Wooden cube

Question 37

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

Answer

Increasing gravitational acceleration

Answer

Increasing its mass

Answer

Decreasing fluid viscosity

Answer

Increasing its surface area

Question 38

38. In which situation is fluid drag negligible?

Answer

Stone in water

Answer

Rain falling

Answer

Skydiver falling

Question 39

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

Answer

Directly proportional to velocity

Answer

Independent of velocity

Answer

Inversely proportional to velocity

Answer

Proportional to square of velocity

Question 40

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

Answer

Speed keeps increasing

Answer

Acceleration is constant

Answer

Acceleration is zero

Answer

Speed is zero

Question 41

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

Answer

Streamlined

Question 42

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

Answer

Water droplet

Answer

Smooth steel ball

Question 43

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

Answer

Becomes negative

Answer

Becomes zero

Question 44

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

Answer

Archimedes' Law

Answer

Stokes’ Law

Answer

Newton’s Second Law

Answer

Bernoulli’s Principle

Question 45

45. How does terminal velocity vary with mass?

Answer

Inversely proportional

Answer

Directly proportional

Answer

Not related

Question 46

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

Answer

Equal to air resistance

Answer

Equal to weight

Question 47

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

Answer

A parachutist falling at constant speed

Answer

A stone thrown upward

Answer

A car accelerating on a highway

Answer

A ball rolling on a table

Question 48

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

Answer

It becomes maximum

Answer

It increases linearly

Answer

It equals the weight

Answer

It becomes zero

Question 49

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

Answer

Just before hitting the ground

Answer

When net force becomes zero

Answer

At the beginning of fall

Answer

At maximum height

Question 50

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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 Online Mcqs Test

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Important Fluid Dynamics Question and Answer

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