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V15C051TY

Total questions: 68

Worksheet time: 3hrs 37mins

Name
Class
Date
1.

Viscosity can be described as...

a)

a physical property of liquids

b)

a physical property of solids

c)

a chemical property of liquids

2.

What is fluid flow?

a)

Describes how fluids behave when frozen.

b)

Describes how fluids behave when heated.

c)

Describes how fluids behave in their surrounding environment.

3.

Which of these are fluids?

a)

Sand and water

b)

Water and Oxygen

c)

Oxygen and Rocks

d)

Rocks and Sand

4.

What is Viscosity?

a)

A fluids colour.

b)

A fluids temperature.

c)

A fluids resistance to flow.

5.

Which of these factors affects Viscosity?

a)

Temperature

b)

Colour

c)

Taste

6.

Liquids with very low viscosity ,flow very _______________________.

a)

fast

b)

not at all

c)

slow

d)

whenever it wants

7.

As temperature increases ,viscosity of liquid _______________.

a)

increases

b)

stays the same

c)

decreases

8.

As temperature increases ,viscosity of gas _______________.

a)

increases

b)

stays the same

c)

decreases

9.

How is viscosity & density affected when a fluid is heated?

a)

viscosity increases & density increases

b)

viscosity decreases & density decreases

c)

viscosity decreases & density increases

d)

temperature has no affect on viscosity or density

10.
What is viscosity?
a)
A liquid's resistance to flow.
b)
a liquids flow.
c)
a liquid
d)
gas to solid.
11.

As the temperature increases the viscosity _______________, the molecules move further apart making the liquid "thinner".

a)

increases

b)

stays the same

c)

decreases

12.

Fluids with very high viscosity flow very _______________________.

a)

fast

b)

not at all

c)

slow

d)

whenever it wants

13.

Which of these are classified as fluids?

a)

Solid

b)

Liquid

c)

Gas

14.

What is flow rate?

a)

The speed of a fish swimming across a lake.

b)

The speed of a rocket going to the moon.

c)

The speed which a fluid flows from one point to another.

15.

What is the SI unit of viscosity?

a)

Pascal (Pa)

b)

Poiseiulle (PI)

c)

Newton/m2

d)

Newton

16.

Flow rate may be determined by the following equation:

a)

Flow Rate = time/volume, measured in s/ml

b)

Flow Rate = volume/ time, measured in ml/s

c)

Flow rate = volume X time

d)

Flow rate = time X volume

17.

What is viscosity?

a)

A measurement of a fluid's resistance to flow or change in shape

b)

The force required to maintain a unit velocity gradient between two parallel layers of liquid

c)

The difference in velocity between the fluid's adjacent layers

d)

The ratio of shearing stress to the velocity gradient of the fluid

18.

What is the measurement of a fluid's resistance to flow or change in shape at a given rate?

a)

Viscous gradient

b)

Coefficient of viscosity

c)

Deformation rate

d)

Viscosity

19.

What role does the coefficient of viscosity play in various applications?

a)

Determining the difference in velocity between the fluid's adjacent layers

b)

Measuring the force required to maintain a unit velocity gradient between two parallel layers of liquid

c)

Determining how easily or difficult a fluid flows under the effect of external forces

20.

Which one is correct about Poiseuille's Law?

a)

The pressure difference between two point is inversely proportional with the volume flow rate

b)

The greater the inner radius of pipe, the greater the volume flow rate of the fluids

c)

Viscosity of the fluid is proportional with the volume flow rate

d)

The longer the pipe, the greater the volume flow rate of the fluids

21.

ΔVΔt=0,125 π . (ρ . g . h . r4l . η)\frac{\Delta V}{\Delta t}=0,125\ \pi\ .\ \left(\frac{\rho\ .\ g\ .\ h\ .\ r^4}{l\ .\ \eta}\right) this formula is called ...

a)

Stoke's Law

b)

Poiseuille’s Law

c)

Newton's Law

d)

Bernoulli's Law

22.

ΔVΔt=0,125 π . (ρ . g . h . r4l . η)\frac{\Delta V}{\Delta t}=0,125\ \pi\ .\ \left(\frac{\rho\ .\ g\ .\ h\ .\ r^4}{l\ .\ \eta}\right) in this formula, ΔVΔt\frac{\Delta V}{\Delta t} is the value of

a)

Flow rate

b)

Fluid volume

c)

Speed of fluid

d)

Time fluid needs to flow

23.

ΔVΔt=0,125 π . (ρ . g . h . r4l . η)\frac{\Delta V}{\Delta t}=0,125\ \pi\ .\ \left(\frac{\rho\ .\ g\ .\ h\ .\ r^4}{l\ .\ \eta}\right) in this formula, ρ\rho is the density of ...

a)

materials

b)

water

c)

fluid

d)

object

24.

ΔVΔt=0,125 π . (ρ . g . h . r4l . η)\frac{\Delta V}{\Delta t}=0,125\ \pi\ .\ \left(\frac{\rho\ .\ g\ .\ h\ .\ r^4}{l\ .\ \eta}\right) in this formula, ρ . g . h\rho\ .\ g\ .\ h is equal to ...

a)

absolute pressure on the surface of fluid

b)

hydrostatic pressure in the ocean

c)

pressure on the pump that pushes the fluid into the holding chamber

d)

pressure difference between the surface of the fluid and the end of the pipe

25.

ΔVΔt=0,125 π . (ρ . g . h . r4l . η)\frac{\Delta V}{\Delta t}=0,125\ \pi\ .\ \left(\frac{\rho\ .\ g\ .\ h\ .\ r^4}{l\ .\ \eta}\right) in this formula, r is equal to ...

a)

radius of the cross-sectional area of ​​the horizontal pipe through which the fluid flows

b)

radius of the cross-sectional area of ​​the vertical pipe through which the fluid flows

c)

horizontal radius of reservoir fluid tube

d)

vertical radius of reservoir fluid tube

26.

ΔVΔt=0,125 π . (ρ . g . h . r4l . η)\frac{\Delta V}{\Delta t}=0,125\ \pi\ .\ \left(\frac{\rho\ .\ g\ .\ h\ .\ r^4}{l\ .\ \eta}\right) in this formula, SI unit of η\eta is ...

a)

kg.m/s

b)

kg/m.s

c)

kg.s/m

d)

m.s/kg

27.

ΔVΔt=0,125 π . (ρ . g . h . r4l . η)\frac{\Delta V}{\Delta t}=0,125\ \pi\ .\ \left(\frac{\rho\ .\ g\ .\ h\ .\ r^4}{l\ .\ \eta}\right) in this formula, SI unit of ΔVΔt\frac{\Delta V}{\Delta t} is ...

a)

m . s2

b)

m/s2

c)

m3/s

d)

m3 . s

28.
Which factor does not affect flow rate?
a)
The size of the pipe or opening the fluid is flowing through
b)
The color of the fluid
c)
The force pushing on the fluid
d)
The type of fluid that is flowing
29.
How is flow rate measured?
a)
By the type of fluid that is flowing
b)
By the size of the pipe or opening the fluid is flowing through
c)
By the volume of fluid moving past a certain point in a given amount of time
d)
By the force pushing on the fluid
30.

Q and R are drops of two different fluids which have been placed on one end of the tile which is tilted. The drops spread down the tile. Which could be a correct explanation for the different lengths shown?

a)

R has a greater viscosity than Q

b)

R has a greater density than Q

c)

R has a greater temperature than Q

d)

All of the above

31.

Which one is correct about Poiseuille's Law?

a)

The pressure difference between two point is inversely proportional with the volume flow rate

b)

The greater the inner radius of pipe, the greater the volume flow rate of the fluids

c)

Viscosity of the fluid is proportional with the volume flow rate

d)

The longer the pipe, the greater the volume flow rate of the fluids

32.

Engine oil (viscosity 0,2 Pa.s) passes through a fine 1.80-mm-diameter tube that is 10.2 cm long. What pressure difference is needed to maintain a flow rate of 6.2 mL/min?

a)

8200 Pa

b)

7800 Pa

c)

6300 Pa

d)

5400 Pa

33.

If the cardiac output of a small dog is 4.1 × 10−3 m3/s, the radius of its aorta is 0.50 cm, and the aorta length is 40.0 cm, determine the pressure drop across the aorta of the dog. (Assume the viscosity of blood is 4.0 × 10−3 Pa·s.)

a)

19 kPa

b)

27 kPa

c)

31 kPa

d)

48 kPa

34.

The flow of water in a pipe is turbulent. Which statement correctly describes turbulent flow?

a)

Speed and direction at a point remain constant

b)

The layers are parallel

c)

The layers do not mix

d)

There are sudden changes in speed and direction

35.

Peanut butter is an example of a...

a)

High viscosity liquid

b)

Low viscosity liquid

c)

Isnt a liquid at all! Don't be silly.

36.

What is the SI unit of viscosity?

a)

Candela

b)

Poise

c)

Newton/m

d)

Pascal

37.

At which of these temperatures is the viscosity of the fluid lowest? (see graph)

a)

40 °C

b)

60 °C

c)

80 °C

d)

100 °C

38.
Which of the following is NOT an example of laminar flow?
a)
a river moving slowly in a straight line
b)
smoke rising upward in a smooth column through air
c)
water flowing evenly from a slight opened faucet
d)
smoke twisting as it moves upward from a fire
39.

What role does the coefficient of viscosity play in various applications?

a)

Determining the difference in velocity between the fluid's adjacent layers

b)

Measuring the force required to maintain a unit velocity gradient between two parallel layers of liquid

c)

Describing the internal friction of a fluid that is moving

d)

Determining how easily or difficult a fluid flows under the effect of external forces

40.

When a skydiver is start falling what happens to

a) her velocity

b) the air resistance?

a)

a) Increases

b) increases

b)

a) increases

b) decreases

c)

a) increases

b) stays the same

d)

a) stays the same

b) increases

41.

Explain why the skydiver will eventually stop accelerating

a)

The air resistance continues to increase as long as the velocity increases. When the air resistance reaches the same value as the weight there will be no resultant force, hence no acceleration (F=ma)

b)

The air resistance continues to decrease as long as the velocity increases. When the air resistance is larger than the weight there will be no resultant force, hence no acceleration (F=ma)

c)

The air resistance stays the same so the velocity increases. There will be no resultant force, hence no acceleration (F=ma)

d)

The air resistance continues to increase as long as the velocity increases. When the air resistance reaches the same value as the weight there will be an increase in acceleration

42.

What is Drag Force?

a)

The force that propels an object forward.

b)

The force that opposes the motion of an object through a fluid (liquid or gas).

c)

The force that keeps an object floating on water.

d)

The force that causes an object to sink in a fluid.

43.

Which of the following factors affects the magnitude of drag force on an object moving through a fluid?

a)

The shape and size of the object.

b)

The density of the fluid

c)

The color of the object.

d)

The density of the object.

44.

In which direction does the drag force act on an object moving through a fluid?

a)

In the same direction as the object's motion.

b)

Perpendicular to the object's motion.

c)

Opposite to the object's motion.

d)

At an angle of 45 degrees to the object's motion.

45.

Which type of fluid experiences more drag force: high viscosity or low viscosity?

a)

High viscosity fluid experiences more drag force.

b)

Low viscosity fluid experiences more drag force.

c)

Drag force is independent of fluid viscosity.

d)

It depends on the object's shape.

46.

What is the relationship between the drag force and the velocity of an object moving through a fluid?

a)

Directly proportional

b)

Inversely proportional

c)

Unrelated

d)

Exponential

47.

What is terminal velocity of a object falling through air?

a)

Terminal velocity refers to an object falling at a constant acceleration after the force of gravity is greater to the air resistance.

b)

Terminal velocity refers to an object falling at a constant velocity after the force of gravity is equal to the air resistance.

c)

Terminal velocity refers to an object falling at a constant acceleration after the force of gravity is equal to the air resistance.

d)

Terminal velocity refers to an object falling at a constant acceleration after the force of gravity is equal to the viscosity.

48.

What is the Formula for Stokes' Law

a)

F = 6πη/rv

b)

F = 4/3 πηrv

c)

F = 6πηrv

d)

F = 6πηr^2v^2

49.

The graph show speed change of skydiver when jump from the plane. At point a ...

a)
constant speed
b)

speed increase

c)

speed decrease

d)

terminal velocity

50.

Weight of the stone falling through a viscous liquid is 8000 N and the upthrust acting on a stone is 2400 N, then the viscous force acting on a stone is

a)

10400 N

b)

8000 N

c)

5600 N

d)

2400 N

51.

The net force on a body falling with a terminal velocity through a viscous liquid will be

a)

0 N.

b)

1 N.

c)

2 N.

d)

4 N.

52.

A spherical body of mass m and radius r, falls down through air of viscosity v as shown in figure.

Which of the following graphs shows the best variation of velocity of the body against time.

a)
b)
c)
d)
53.

The terminal velocity of a free falling water droplet in air is attained when

a)

drag force = - weight of droplet

b)

drag force = weight of droplet

c)

drag force < weight of droplet

d)

drag force > weight of droplet

54.

What will be the velocity of water falling from a greater height as it reaches the ground?

a)

increasing.

b)

decreasing.

c)

become zero.

d)

remain constant.

55.

Turbulent flow is

a)

Unsteady and regular

b)

Steady and irregular

c)

Unsteady and irregular

d)

Steady and regular

56.

What is the SI unit of the viscous drag force in Stoke's Law equation?

a)

Newton

b)

Joule

c)

Watt

d)

Pascal

57.

Which of the following are correct assumptions when modelling objects which conform to Stoke's law?

a)

The object is large and the motion is laminar.

b)

The object is small and the motion is laminar.

c)

The object is large and the motion is turbulent.

d)

The object is small and the motion is turbulent.

58.

When does an object reach terminal velocity?

a)
When the object is in free fall
b)
When the force of gravity is greater than the force of air resistance
c)
When the force of gravity is equal to the force of air resistance.
d)
When the object is at rest
59.

In the expression...

F=6πηrvF=6\pi\eta rv  

a)

η\eta  represents density and  ν\nu  represents viscosity

b)

r represents radius and  η\eta  represents density

c)

r represents radius and  ν\nu  represents viscosity

d)

η\eta  represents viscosity and  ν\nu  represents velocity

60.

A small metal ball is dropped into a cylinder of oil. The time taken for the ball to fall to the bottom is recorded. Which changes to the ball would result in the greatest decrease in the time taken to reach the bottom?

a)

Smaller mass and smaller diameter

b)

Smaller mass and greater diameter

c)

Greater mass and smaller diameter

d)

Greater mass and greater diameter

61.

A ball bearing is dropped through a liquid and its terminal velocity measure. The experiment is repeated at a different temperature. Which answer correctly describes this second experiment?

a)

Lower temperature: greater viscosity and faster velocity

b)

Lower temperature: greater viscosity and slower velocity

c)

Higher temperature: greater viscosity and slower velocity

d)

Higher temperature: smaller viscosity and slower velocity

62.

A ball bearing is released in a cylinder filled with oil. Which of the following would have to increase to increase the time taken for the ball bearing to reach the bottom?

a)

The temperature of the oil

b)

The viscosity of the oil

c)

The gravitational field strength

d)

The density of the ball bearing

63.

A table tennis ball is released beneath the surface of water and moves upwards. The relationship between the forces acting on the ball when it reaches terminal velocity is...

a)

weight = upthrust

b)

weight + drag = upthrust

c)

weight = upthrust + drag

d)

weight = drag

64.

In an experiment a small metal ball is dropped into a cylinder of oil. The time taken for the ball to fall to the bottom of the cylinder is recorded.

The experiment is repeated. Which changes to the ball would result in the greatest decrease in the time it takes to reach the bottom of the cylinder?

a)

smaller mass and smaller diameter

b)

smaller mass and greater diameter

c)

greater mass and smaller diameter

d)

greater mass and greater diameter

65.

Which one is correct about Poiseuille's Law?

a)

The pressure difference between two point is inversely proportional with the volume flow rate

b)

The greater the inner radius of pipe, the greater the volume flow rate of the fluids

c)

Viscosity of the fluid is proportional with the volume flow rate

d)

The longer the pipe, the greater the volume flow rate of the fluids

66.

Two identical spheres are dropped into two different columns; one column contains a liquid of viscosity 0.5 Pa.s while the other contains a liquid of the same density but unknown viscosity. The sedimentation velocity in the second tube is 20% lower than the sedimentation velocity in the first tube. What is the viscosity of the second liquid?

a)

0.625 Pa.s

b)

0.5 Pa.s

c)

2.5 Pa.s

d)

1.0 Pa.s

67.

What are the two types of fluid flow associated with frictional drag?

a)

Laminar and Turbulent

b)

Viscous and Non-viscous

c)

Compressible and Incompressible

d)

Steady and Unsteady

68.

A skydiver has a weight of 900 N. When reaching terminal velocity while in the air, the upthrust is 5% of the weight. What is the the drag force at that moment?

a)

45 N up

b)

45 N down

c)

855 N up

d)

855 N down

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