MDCAT XI Physics Vectors+ Fluid Dynamics Current Online Test-2

376

Created on July 27, 2025 By

📚 Test Details

Subject: Physics
Class: 1st year / XI
Chapter: Vectors+ Fluid Dynamics
Test: 2
Book: Sindh Textbook
Total No. Of MCQs: 50 MCQs
Time Allowed: 50 Minutes

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Price: Free

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1 / 50

1. The maximum velocity at which the weight of the body is equal to upthrust force of fluid is called as :

a) uniform velocity

b) Terminal velocity

c) Max velocity

d) viscous drag velocity

2 / 50

2. The law which states that the Drag force experienced by a small spherical body in a fluid is related to velocity of the body and viscosity of fluid is called as:

a) Gravitational law

b) law of gravitation

c) Stokes law

d) Bernoulli's law

3 / 50

3. A drop of rain falling with the terminal velocity of 8.7m/s near the surface of earth what will be the radius of this drop if density of water is 1000kg/m³ and density of air is 1kg/m³:

a) 0.4

b) 0.6

c) 0.2

d) 0.3

4 / 50

4. If the mass of small spherical bob is doubled and radius is reduced to half then the drag force on the bob in a fluid will:

a) increase by two times

b) decrease by two times

c) remains the same

d) Quadrupled

5 / 50

5. In a steady flow the velocity of fluid particles at any instant:

a) decreases as time passes

b) increases as time passes

c) remains same as the time passes

d) reaches to maximum from minimum as time passes

6 / 50

6. Unsteady flow of a fluid is characterized by which one of the following characteristics:

a) change in velocity of fluid only

b) change in pressure of fluid only

c) change in density of fluid only

d) change in all parameters of fluid

7 / 50

7. For an incomprehensible fluid the equation of continuity is :

a) p1A1V1=p2A2V2

b) AV=constant

c) A1V1=A2V2

d) none

8 / 50

8. Equation of continuity is the form of law of :

a) conservation of momentum

b) law of conservation of mass

c) law of conservation of energy

d) all of them

9 / 50

9. when the range of Reynolds number (Re)is 2300←Re←4000 then this type of flow of fluid is characterized as:

a) Laminar flow

b) Transient flow

c) Turbulent flow

d) Stokes flow

10 / 50

10. An ideal fluid is characterized with which one of the following properties:

a) compressible and viscous fluid

b) incomprehensible and viscous fluid

c) compressible and non-viscous fluid

d) non-viscous and incomprehensible fluid

11 / 50

11. According to the equation of continuity of the expression is AV=X , Then what are the dimensions of X:

a) m³/s

b) m³/s

c) s/m³

d) m³.s

12 / 50

12. Following the Bernoulli's principle which one of the following relationship can be assumed:

a) If the velocity of fluid is high then pressure also must be high

b) If the velocity of fluid is low also the pressure must be low

c) if the velocity of fluid is low pressure must be high

d) pressure and velocity of fluid are must not be related

13 / 50

13. Bernoulli's principle is the practical example of :

a) law of conservation of mass

b) law of conservation of energy

c) both law of conservation of mass and energy

d) law of conservation of pressure and velocity

14 / 50

14. When a person is standing close to the railway track a fast train passes to him and pulls the person it is idealized condition assumed under the :

a) Newton's 2nd law of motion

b) Newton's 1st law of motion

c) Bernoulli's principle

d) Newton's law of gravitation

15 / 50

15. Flow of blood through blood vessels is the practical application of :

a) Stokes law

b) Bernoulli's principle

c) Doppler's effect

d) equation of continuity

16 / 50

16. The dimensions of coefficient of viscosity are:

a) M L⁻¹ T⁻¹

b) M⁻² L¹ T¹

c) M L T⁻¹

d) M² L⁻¹ T⁻¹

17 / 50

17. Venturi meter is an application of Bernoulli's principle which is used to measure the :

a) Fluid pressure

b) Fluid density

c) Fluid speed

d) all of them

18 / 50

18. The effect of decrease in pressure with the increase of speed of fluid in a horizontal pipe is known as :

a) Bernoulli's effect

b) streamline effect

c) Venturi effect

d) Stokes' effect

19 / 50

19. In which one of the following type of fluid flow the path of fluid particles cannot be tracked :

a) laminar flow

b) streamline flow

c) Turbulent flow

d) Venturi flow

20 / 50

20. Which one of the following equation represents Stokes' law :

a) F=6πnrv²

b) F=6πnr²v

c) F=6πnr²v²

d) F=6πnrv

21 / 50

21. According to the equation of continuity,A1V1=A2V2 = constant,where the constant is equal to:

a) Flow rate

b) volume of fluid

c) mass of fluid

d) density of fluid

22 / 50

22. When the resultant of two forces of equal magnitude is also equal to the magnitude of forces ,then the angle between two forces can be equal to:

a) 30

b) 60

c) 90

d) 120

23 / 50

23. If A.B=A×B then the angle between them can be :

a) 30

b) 45

c) 60

d) 90

24 / 50

24. Which one of the following physical quantity is the result of cross product of the two vectors:

a) work

b) momentum

c) Torque

d) power

25 / 50

25. Assertion: Terminal velocity is attained when net force on the object is zero.

Reason: At terminal velocity, drag and upthrust cancel out the weight of the object.

a) Both A and R are true and R explains A

b) Both A and R are true but R does not explain A

c) A is true, R is false

d) A is false, R is true

26 / 50

26. A single vector having the same effect as all the original vectors taken together is called:

a) resultant vector

b) equal vector

c) positive vector

d) unit vector

27 / 50

27. The resultant of two forces 30N and 40N acting at an angle 90 is equal to:

a) 30N

b) 40N

c) 50N

d) 70N

28 / 50

28. what is the mathematical value of unit vector is equal to:

a) 0

b) 1

c) 2

d) 3

29 / 50

29. A force of 10N is acting along x-axis it's component along y-axis is equal to:

a) 10N

b) 5N

c) 8.66N

d) 0N

30 / 50

30. pick the odd one from the followings:

a) power

b) work

c) torque

d) potential difference

31 / 50

31. Dot product of two non-zero vectors is zero, when the angle between them is equal to:

a) 0

b) 30

c) 45

d) 90

32 / 50

32. The minimum number of unequal forces whose resultant will be zero :

a) 2

b) 3

c) 4

d) 5

33 / 50

33. If A.B=1,A=2,B=1 then the angle between them is equal to:

a) 30

b) 60

c) 90

d) 45

34 / 50

34. The sum of magnitude of two forces is 16N .The resultant force is 8N and it's direction is perpendicular to the minimum force,then the forces are :

a) 6N & 10N

b) 8N & 8N

c) 4N & 12N

d) 2N & 14N

35 / 50

35. If |A|=|B|,then what is the angle between A+B and A-B is equal to:

a) 0

b) 45

c) 60

d) 90

36 / 50

36. When the two forces of magnitude F are multiplied such that the value of resultant force is also equal to F then what will be the angle between two forces :

a) 60

b) 90

c) 120

d) 30

37 / 50

37. When fluid is incomprehensible then:

a) velocity of fluid is constant

b) flow of fluid is straight line

c) density of fluid is constant

d) volume of fluid is constant

38 / 50

38. Two water droplets have radius ratio 2:3 their terminal velocities will be:

a) 4:6

b) 4:9

c) 2:9

d) 4:3

39 / 50

39. Terminal velocity is :

a) Uniform velocity

b) Maximum velocity

c) minimum velocity

d) Uniform and maximum velocity

40 / 50

40. Terminal velocity is given by the equation:

a) Vt=gr²

b) Vt=2pgr²/9n

c) Vt=gr²/9n

d) Vt=9gr²/2n

41 / 50

41. Terminal velocity of the body is directly proportional to the:

a) Radius of the body

b) Mass of the body

c) Size of the body

d) all of them

42 / 50

42. Stokes law is applicable to the :

a) spherical bodies

b) circular bodies

c) rough bodies

d) square bodies

43 / 50

43. When the body reaches to it's terminal velocity,then the acceleration of body becomes:

a) Maximum

b) Minimum

c) Zero

d) constant

44 / 50

44. The acceleration of a falling body in a fluid depends upon :

a) Velocity of body

b) Viscosity of body

c) Density of the body

d) All of them

45 / 50

45. Two forces of 12N and 6N are applied to a body simultaneously. The maximum magnitude of their resultant vector is equal to:

a) 24N

b) 30N

c) 18N

d) 36N

46 / 50

46. The magnitude of the resultant of two forces is 2F. If the magnitude of each force is F,then what will be the angle between these two forces :

a) 0

b) 90

c) 120

d) 180

47 / 50

47. If A=2i+j+2k then the magnitude of this vector is equal to:

a) 9

b) 6

c) 3

d) 1

48 / 50

48. If the scalar product of the two non-zero vectors A&B is zero,the magnitude of their vector product will be:

a) AB

b) ZERO

c) ABSinθ

d) ABCosθ

49 / 50

49. A fluid is going incomprehensible flow which represents that:

a) Pressure at a given point cannot change with time

b) Velocity at a given point cannot change with time

c) The density cannot change with time or location

d) The velocity must be same everywhere

50 / 50

50. The resultant of two forces 5N and 10N cannot be:

a) 4N

b) 6N

c) 9N

d) 15N

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