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 = mg/r²

Answer

vₜ = (rη)/(2ρg)

Answer

vₜ = ηg/ρ

Answer

vₜ = (2r²g(ρ - σ)) / 9η

Question 2

2. Which force balances weight at terminal velocity?

Answer

Centrifugal force

Answer

Drag force

Answer

Electromagnetic force

Answer

Normal force

Question 3

3. How can terminal velocity be increased?

Answer

Increase surface area

Answer

Increase fluid density

Answer

Decrease object mass

Answer

Decrease surface area

Question 4

4. 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 5

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

Answer

Steel ball

Answer

Wooden cube

Answer

Crumpled paper

Question 6

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

Answer

It is absent in a vacuum

Answer

It depends on velocity

Answer

It increases when mass increases

Answer

It always acts opposite to motion

Question 7

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

Answer

Fluid drag

Answer

Compression

Question 8

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

Answer

Stronger gravity

Answer

Higher drag to weight ratio

Answer

Less weight

Question 9

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

Answer

Streamlined

Question 10

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

Answer

When net force becomes zero

Answer

Just before hitting the ground

Answer

At the beginning of fall

Answer

At maximum height

Question 11

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

Answer

Sound produced

Answer

Object’s shape, size, and mass

Answer

Color and texture

Answer

Volume only

Question 12

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

Answer

It accelerates downward

Answer

It comes to rest

Answer

It sinks with constant velocity

Question 13

13. What causes a skydiver to reach terminal velocity?

Answer

Constant acceleration

Answer

Gravity only

Answer

Lack of friction

Answer

Air resistance increasing with speed

Question 14

14. Which of the following best describes fluid drag?

Answer

Upthrust acting downward

Answer

Attractive force in liquids

Answer

Force of gravity in fluid

Answer

Resistance force exerted by fluid

Question 15

15. Which fluid property affects drag the most?

Answer

Transparency

Question 16

16. In which situation is fluid drag negligible?

Answer

Stone in water

Answer

Rain falling

Answer

Skydiver falling

Question 17

17. What is drag?

Answer

Downward force in a solid

Answer

Frictional force exerted by fluids

Answer

Centripetal force

Answer

Upward force acting in vacuum

Question 18

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

Answer

Gravitational force

Answer

Normal force

Answer

Drag force

Answer

Magnetic force

Question 19

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

Answer

Stokes’ Law

Answer

Bernoulli’s Principle

Answer

Newton’s Second Law

Answer

Archimedes' Law

Question 20

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

Answer

Increasing fluid density

Answer

Decreasing speed

Answer

Increasing surface smoothness

Answer

Reducing area

Question 21

21. How is terminal velocity useful in designing parachutes?

Answer

Helps increase falling speed

Answer

Helps reduce upward motion

Answer

Helps control and limit descent speed

Answer

Eliminates the effect of gravity

Question 22

22. The direction of drag force is always:

Answer

Along velocity

Answer

Opposite to motion

Answer

Perpendicular to motion

Question 23

23. What is the SI unit of drag force?

Question 24

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

Answer

Speed of object

Answer

Color of object

Answer

Shape of object

Answer

Density of fluid

Question 25

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

Answer

The object’s mass

Answer

Gravitational field

Answer

The relative motion between the object and fluid

Question 26

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

Answer

Density of the object

Answer

Fluid density

Answer

Object radius

Question 27

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

Question 28

28. What is terminal velocity?

Answer

The maximum constant speed of a falling object in a fluid

Answer

The speed at which pressure becomes zero

Answer

The speed of sound

Answer

The highest speed of a car

Question 29

29. How does terminal velocity vary with mass?

Answer

Inversely proportional

Answer

Directly proportional

Answer

Not related

Question 30

30. How does fluid viscosity affect terminal velocity?

Answer

Increases it

Answer

Has no effect

Answer

Decreases it

Answer

Makes it infinite

Question 31

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

Answer

It becomes maximum

Answer

It becomes zero

Answer

It increases linearly

Answer

It equals the weight

Question 32

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

Answer

Speed keeps increasing

Answer

Speed is zero

Answer

Acceleration is constant

Answer

Acceleration is zero

Question 33

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

Answer

Inversely proportional to velocity

Answer

Independent of velocity

Answer

Proportional to square of velocity

Answer

Directly proportional to velocity

Question 34

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

Answer

Less resistance

Answer

Greater resistance

Answer

No change in velocity

Answer

Constant acceleration

Question 35

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

Answer

Water droplet

Answer

Smooth steel ball

Question 36

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

Answer

Stays the same

Answer

Becomes zero

Question 37

37. Terminal velocity occurs when:

Answer

Drag force = 0

Answer

Drag force > weight

Answer

Drag force = weight

Answer

No force acts on the object

Question 38

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

Answer

Becomes negative

Answer

Becomes zero

Question 39

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

Answer

Accelerated motion

Answer

Terminal motion

Answer

Free motion

Answer

Uniform motion

Question 40

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

Answer

Decreasing fluid viscosity

Answer

Increasing its surface area

Answer

Increasing gravitational acceleration

Answer

Increasing its mass

Question 41

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

Answer

Decreased density

Answer

Increased color

Answer

Increased mass

Answer

Increased volume

Question 42

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

Answer

Becomes zero

Answer

Remains constant

Answer

Increases with square of velocity

Question 43

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

Answer

A stone thrown upward

Answer

A ball rolling on a table

Answer

A parachutist falling at constant speed

Answer

A car accelerating on a highway

Question 44

44. Which object is most affected by air resistance?

Answer

Plastic ball

Answer

Flat sheet of paper

Answer

Glass marble

Question 45

45. Which quantity becomes constant at terminal velocity?

Answer

Acceleration

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 affects terminal velocity?

Answer

Shape and surface area

Answer

Color of the object

Answer

Volume only

Answer

Temperature of the object

Question 48

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

Answer

Becomes zero

Answer

Stays constant

Question 49

49. What happens to terminal velocity in a vacuum?

Answer

Becomes infinite

Answer

Does not exist

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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