Quiz: Chapter 5 - Fluid Dynamics

1 As water falls down from taps, its speed increases and cross-sectional area:

Becomes zero Increases Decreases Remains constant

2 The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is:

Zero Variable Constant None

3 The mathematical form of equation of continuity is:

A₁V₁ = A₂V₂ A₁V₂ = A₂V₁ A₁/V₁ = A₂/V₂ A₁A₂ = V₁V₂

4 The product of cross-sectional area of pipe and fluid velocity is called:

Mass rate Energy rate Flow rate Viscosity rate

5 The SI units of flow rate is:

m/s m³/s m/s² kg m/s

6 Equation of continuity is based upon law of conservation of:

Momentum Energy Mass Charge

7 Water flows through a hose with internal cross-section area 1 cm² at 1 m/s. If water exits at 20 m/s, the nozzle area is:

5 × 10⁻² cm² 5 × 10⁻¹ mm 5 × 10⁻³ m² 5 × 10⁶ m²

8 The sum of pressure, potential energy per unit volume, and kinetic energy per unit volume along a streamline is constant in:

Bernoulli’s effect Torricelli’s effect Venturi’s effect Viscosity effect

9 Bernoulli’s equation is applicable for:

Streamlined flow of compressible fluids Streamlined flow of incompressible fluids Turbulent flow of compressible fluids Turbulent flow of incompressible fluids

10 Bernoulli’s equation is based upon law of conservation of:

Momentum Energy Mass Charge

11 The unit of ρgh in Bernoulli’s equation is:

Pressure Velocity Work Height

12 The equation relating pressure to fluid speed and height is:

Bernoulli’s equation Equation of continuity Venturi relation Torricelli’s theorem

13 A 2-meter high tank has a hole at its middle. The speed of efflux is:

3.75 m/s 4.91 m/s 4.42 m/s 5.11 m/s

14 Maximum drag force on a falling sphere is 9.8 N. Its weight is:

1 N 9.8 N 19.8 N 4.9 N

15 As the speed of an object moving through a fluid increases, the upward drag force:

Decreases Increases Remains same Becomes zero

16 When a droplet reaches terminal velocity, its acceleration is:

Zero Variable Constant None of them

17 The terminal velocity of a spherical object is given by:

vₜ = 2gρr²/9η vₜ = √(2gρr²/9η) vₜ = 2gρr/9η None of these

18 The terminal velocity of a sphere in a viscous fluid is:

Directly proportional to radius Inversely proportional to radius Directly proportional to radius squared Inversely proportional to radius squared

19 When drag force equals a raindrop’s weight, the net force on the drop:

Starts increasing Starts decreasing Remains constant Becomes zero

20 The word "fluid" means:

To resist To flow To walk None of these

21 If temperature rises, the coefficient of viscosity of a liquid:

Decreases Increases Remains unchanged Increases for some liquids and decreases for others

22 Stoke’s law holds for:

Cylindrical bodies Cubical bodies Spherical bodies None of these

23 The drag force F_d on a sphere of radius r moving slowly with speed v through a fluid of viscosity η is:

6πηrv 6πηr²v √(6πηrv) 2πηrv

24 The formula F_d = 6πηrv is derived by:

Bernoulli Newton Stokes Joule

25 Which is most viscous?

Glycerin Honey Water Coal Tar

26 The SI unit of coefficient of viscosity is:

Kg m⁻¹s⁻¹ Kg m⁻¹s⁻² Kg ms⁻² Kg m⁻¹s

27 The dimensional formula for viscosity is:

[MLT⁻¹] [ML⁻¹T⁻¹] [MLT²] [ML²T⁻¹]

28 The frictional effect between fluid layers is called:

Mass Velocity Density Viscosity

29 A stirred liquid comes to rest due to:

Surface tension Viscosity Density Low compressibility

30 Which has the highest viscosity?

Water Alcohol Honey Kerosene

31 Drag force at low speeds is proportional to:

Velocity Velocity squared √Velocity Velocity cubed

32 Friction in fluids is called:

Drag force Viscosity Surface tension None

33 When air passes between two suspended balls, the distance between them:

Increases Decreases Remains same May increase or decrease depending on speed

34 In a pipe constriction, fluid velocity and pressure change as:

Both decrease Both increase Velocity decreases, pressure increases Velocity increases, pressure decreases

35 A gale blowing over a house exerts force on the roof:

Downward Upward Zero Horizontal

36 Dams are thicker at the bottom because:

Water pressure increases with depth Water density increases with depth More water is at the bottom None of these

37 Paint guns operate based on:

Bernoulli’s principle Equation of continuity Torricelli’s theorem Newton’s laws

38 If pipe area increases, fluid pressure:

Increases Decreases Remains constant None

39 Where streamlines are closer, flow speed is:

Smaller Greater Same Zero

40 Air blows from:

High to low temperature Low to high temperature Low to high pressure High to low pressure

41 Which cannot be explained by Bernoulli’s theorem?

Roofs blowing off in winds Curved path of a spinning ball Atomizer working Capillary rise

42 A Venturi meter measures:

Fluid pressure Fluid volume Atomizer working Capillary rise

43 Blood pressure is measured with a:

Sphygmomanometer Multimeter Barometer Thermometer

44 1 torr equals how many N/m²?

1.33 N/m² 133.3 N/m² 1333 N/m² 13.33 N/m²

45 Human blood pressure is measured in:

Nm² mm Pascal Cm

46 The rate of leak from a hole in a tank is:

Independent of height Higher near the bottom Higher near the top Highest at midway

47 Torricelli’s theorem states efflux speed equals velocity gained by falling through height h under:

Gravity Velocity Pressure Drag force

48 The rate of outflow through an orifice does not depend on:

Orifice radius Liquid column height Gravity Liquid density

49 If a hole is 4.9 m below water surface, discharge velocity is:

4.9 m/s 2.45 m/s 9.8 m/s 0 m/s

50 Pressure is low where fluid speed is:

Low High Zero Uniform

51 Carburetors use:

Newton’s laws Kepler’s law Bernoulli’s law Coulomb’s law

52 The Venturi effect describes pressure decrease with:

Bernoulli’s effect Torricelli’s effect Venturi’s effect Viscosity effect

53 Blood pressure is smallest when:

Standing upright Sitting relaxed Lying horizontally Standing on hands

54 When a spinning tennis ball moves forward, air velocity on one side:

Becomes zero Doubles Decreases Remains constant

55 Blood density is:

Less than water Equal to water Greater than water None

56 Blood pressure ranges from:

70–80 torr 55–80 torr 75–100 torr 80–120 torr

57 Systolic pressure is about:

120 torr 125 torr 150 torr 100 torr

58 Blood viscosity is ___ times water’s viscosity:

1–2 2–3 3–4 3–5

59 Blood pressure inside vessels is:

Less than atmospheric Greater than atmospheric Equal to atmospheric Either less or equal

60 The lower blood pressure reading is called:

Systolic Diastolic Both None

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Chapter 5: Fluid Dynamics