Smart Guess & Test Papers

Student Name ______________________ Father Name ______________________ Roll Number _______

Class: 1st /year - Physics Marks : 64 Exam Format : Chapter Wise MCQs
Time : notespk.com_Nauman Sadaf | Date _________________ Examiner Sig __________ Chapter#: 6

MCQ's S/Q L/Q Total

Objective Type

‫تس‬
1. Encircle the Correct Option. (1 x 64 = 64) ‫وجاب ےک رگد دارئہ اگلںیئ۔‬ ‫در‬ .1
1) The study of the properties of fluid in motion is called
a) Fluid statics b) Fluid dynamics c) Electro dynamic d) None of these

2) The study of fluid in motion is simplified by using

a) Law of conservation of mass b) Law of conservation energy c) Both of these d) Law of conservation of mass

3) The law of conservation of mass gives us

a) Equation of continuity b) Bernoulli's theorem c) Stokes theorem d) None of them

4) Law of conservation of energy in the basis of

a) Equation of continuity b) Bernoulli's theorem c) Stoke's theorem d) All of these

5) The frictional effect between different layers of a flowing fluid is described in terms of
a) Viscosity of fliud b) Velocity of fluid c) Accelerations of fluid d) All of these

6) Substances that do not flow easily have

a) Small coefficient of b) Large coefficient of c) Zero coefficient of viscosities d) None of these
viscosities viscosities
7) Thick tar and honey have
a) Large co-efficient of b) Zero co-efficient of c) Small co-efficient of d) None of these
viscosities viscosities viscosities

8) The _______ effect between different layers of a fluid is described in terms of viscosity.
a) Frictional b) Gravitational c) Chemical d) Both A & B

9) Water can flow easily , so it has

a) Small co-efficient of b) Large co-efficient of c) Zero co-efficient of viscosity d) None of these
viscosity viscosity

10) When the temperature increase , the viscosity

a) Decreases b) Increases c) Remains constant d) None of these

11) Stokes law holds for bodies moving

a) Slowly b) Moving with velocity of light c) At rest d) None of these

12) An object moving through a fluid exprerience a retarding force called

a) Fluid fraction b) Impulsive force c) Drag force d) Both A & B

13) The drag force increases as the speed of the object

a) Decreases b) Increases c) Remains constant d) None of these

14) According to stoke's law the viscous or drag force on a sphere of radius " r " moving with slowly speed is give by

a) b) c) d)

15) The equation is called

a) Newton's law b) Stoke's law c) Pascal law d) Bragg's law

16) When the magnitude of the drag force becomes equal to weight , the net force acting on the droplet is
a) Maximum b) 9.8 N c) Zero d) None of these

17) The maximum constant velocity attained by a spherical droplet when the drag force and the weight of drop become equal is called
a) Critical velocity b) Variable velocity c) Terminal velocity d) Average velocity

18) A body of mass " m " is falling in a viscous medium with terminal velocity " v " net force on the body will be
a) mg b) Zero c) d) ​

19) When droplet of water attains terminal velocity the acceleration is

a) Maximum b) Negative c) Constant d) Zero
20) The expression for terminal velocity of a fog droplet is

a) b) c) d)

21) Stoke's law holds for bodies when they have

a) Linear shape b) Oblong shape c) Spherical shape d) Curved shape

22) The S.I. unit of co-efficient of viscosity is

a) kgm-1s-2 b) kgm-1s-1 c) Nsm-2 d) Both B & C

23) The dimensions of co-efficient of viscosity are

a) [ MLT-1 ] b) [ MLT-2 ] c) [ ML-1T-1 ] d) [ ML2T-1 ]

24) Drag force does not depend upon

a) Speed of sphere b) Viscosity of medium c) Size of sphere d) None of these

25) When a fluid is in motion , its flow can be

a) Streamline b) Turbulent c) Steady d) All of these

26) If every particle that passes a particular point , moves along exactly the same path , as followed by particular which passed that points
earlier , the flow is said to be
a) Streamline b) Laminar c) Steady d) All of these

27) The different streamlines cannot cross each other , this condition is called
a) Steady flow condition b) Unsteady flow condition c) Turbulent flow condition d) None of these

28) The direction of the streamline is the same as the direction of

a) Force b) Velocity c) Weight d) All of these

29) The irregular or unsteady flow of the fluid is called

a) Streamline flow b) Laminar flow c) Turbulent flow d) None of these

30) Fluid is said to be ideal , if

a) It is non-viscous b) It is in compressible c) The fluid motion is steady d) All of these

31) The fluid is said to be incompressible if its density is

a) Zero b) Very high c) Very small d) Constant

32) Equation of continuity gives the conservation of

a) Mass b) Energy c) Speed d) Volume

33) If the area of cross section of a pipe is increased to double , the velocity of fluid becomes
a) Half b) Double c) Remain same d) One-fourth

34) The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is
a) Constant b) Variable c) Zero d) None of these

35) If diameter of a pipe is reduced to half , then the speed of fluid becomes
a) 2 Times b) 4 Times c) 8 Times d) 1/4 Times

36) Rate of flow = constant , is according to

a) Bernoulli's theorem b) Equation of continuity c) Torricelli's theorem d) Venturi relation

37) As water falls down from taps its speed increases and cross-sectional area
a) Becomes zero b) Increases c) Decreases d) None of these

38) According to equation of continuity fluid speed is inversely proportional to ( A = area of cross section )
a) A2 b) A c) d)

39) The SI unit of flow rate is

a) m/s b) m3/s c) m2/s d) m2/s2

40) According to equation of continuity

a) A2 v = constant b) A v2 = constant c) A v = constant d) = constant​​

41) Bernoulli's equation is the fundamental equation in fluid dynamics that relates pressure to fluid
a) Speed b) Height c) Both of them d) None of these

42) According to Bernoulli's equation

a) b) c) d)

43) According to torricelli's theorem , the speed of efflux can be written as

 a) b) c) d)

44) The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is called
a) Equation of continuity b) Bernoulli's Theorem c) Torricelli's theorem d) Venturi's theorem

45) The pressure will be low where the speed of the fluid is
a) Zero b) High c) Low d) Constant

46) A 10 metre high tank is full of water . A hole appears at its middle . What is the speed of efflux ( g = 10 m / s2 )
a) 100 ms-1 b) 10 ms-1 c) 1 ms-1 d) Zero

47) Where the streamlines are very close to each other , the pressure will be
a) Zero b) High c) Low d) None of them

48) A device used to measure speed of liquid flow is called

a) Barometer b) Venturi meter c) Volmeter d) Sphygmonanometer

49) The effect of decrease in pressure with increase in velocity of fluid in a horizontal pipe is called
a) Venturi effect b) Torricelli's theorem c) Viscosity d) None of these

50) The airplane lift is based on

a) Linear momentum b) Angular momentum c) Bernoulli's principle d) All of these

51) Blood is an
a) Compressible fluid b) Incompressible fluid c) Non-viscous fluid d) Both B & C

52) The density of blood is nearly equal to that of

a) Milk b) Honey c) Thick tar d) Water

53) High concentration of red blood cells increases the viscosity of blood from
a) 2-3 time that of water b) 3-5 time that of water c) 2-4 time that of water d) 5-7 time that of water

54) Under normal circumstances the volume of the blood is sufficient to keep the vessels
a) Inflated at all time b) Flatted at all times c) Either of these d) None of these

55) The internal pressure of the blood is

a) Greater then external b) Less than external atmospheric c) Equal to the external d) None of these
atmospheric pressure pressure atmospheric pressure

56) The blood pressure of the person

a) Decreases with age b) Increases with age c) Remains constant d) None of these

57) The systolic pressure ( high pressure ) of normal healthy person is

a) 210 torr b) 160 torr c) 120 torr d) 80 torr

58) The diastolic pressure ( low pressure ) of normal healthy person is

a) 110-120 torr b) 75-80 torr c) 100-110 torr d) 120-130 torr

59) Human blood pressure is measured in

a) Nm-2 b) Pascal c) torr d) All of these

60) The relation between Nm-2 and torr is

a) 1 torr = 13.33 Nm-2 b) 1 torr = 133.3 Nm-2 c) 1 torr = 1333.0 Nm-2 d) 1 torr = 1.333 Nm-2

61) Blood pressure is measured by a instrument called

a) Barometer b) Stethoscope c) Sphygmonanometer d) Hydrometer

62) The instrument which detects the instant at which the external pressure becomes equal to systolic pressure is
a) Venturi meter b) Hydrometer c) Stethoscope d) None of these

63) For which position , will the maximum blood pressure in the body have the smallest value
a) Standing up right b) Lying horizontally c) Standing on one's head d) Sitting relaxed

64) The law of conservation of energy is the basis of:

a) Equation of continuity b) Bernoulli's equation c) Venturimeter d) Interference