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Science 8 Unit A Sec 3.0

Total questions: 71

Worksheet time: 1hrs 17mins

Name
Class
Date
1.

What is pressure?

a)

Somebody convincing you to jump into a pool.

b)

How deep a well is.

c)

Amount of force applied to a given area.

d)

Amount of water in a cup of water.

2.

Force is measure in Newtons.

a)

True

b)

False

3.

Hydraulic systems use natural gas as an enclosed fluid.

a)

True

b)

False

4.

Pneumatic means it uses:

a)

Wood

b)

Gasoline

c)

Air

d)

Water

5.

To find the pressure on an object you need to calculate:

a)

pressure = F/A

b)

pressure = A/F

c)

pressure = F x A

d)

pressure = A x F

6.

A pneumatic system would be found in a dentist drill, air brakes of a big truck, jake hammer and paint sprayers.

a)

True

b)

False

7.

If there is a leak in a hydraulic or pneumatic system, the pressure will increase.

a)

True

b)

False

8.

If a hydraulic system has 1000 N applied to the input piston and has an area of 81 cm2, what is the pressure?

a)

12.35 Pa

b)

12,346 Pa

c)

1235 Pa

d)

123,457 Pa

9.

The viscosity of liquids can be compared by observing their ...

a)

clarity

b)

volume

c)

resistance to flow

d)

resistance to acceleration

10.

In order to increase the speed of flow of oil in a pipeline, the oil should be ...

a)

heated

b)

cooled

c)

expanded

d)

compressed

11.

Which of the following statements best describes the correct difference, in terms of density?

a)

liquids are less dense than gases

b)

gases are less dense than liquids

c)

gases are more dense than solids

d)

liquids are more dense than solids

12.

When your dad or mom start the cold car in the morning, they may mention that the viscosity of the motor oil would be decreased by ...

a)

running the engine

b)

charging the battery

c)

changing the antifreeze

d)

replacing the thermostat

13.

In order to increase the speed of flow of oil in a pipeline, the oil should be ...

a)

heated

b)

cooled

c)

expanded

d)

compressed

14.

Archimedes principle states that 'the buoyant force acting on an object equals ...

a)

the mass of the fluid displaced by the object

b)

the force that holds the object afloat

c)

the weight of the object displaced by the fluid

d)

the weight of the fluid displaced by the object

15.

Your friends collected rocks from a lake to build a perimeter for the fire pit. They noticed that the rocks weren't as heavy while they carried them partially submerged in the water. This is because of the ...

a)

mass of the rock

b)

density of the water

c)

buoyant force of the water

d)

buoyant force of the rock

16.
The density of water is _________.
a)
15 g/ml
b)
.5 g/ml
c)
1.0 g/ml
d)
100 g/ml
17.
Density measures _______________.
a)
the mass of an object
b)
how tightly packed the particles of an object are
c)
the pull of gravity on an object
d)
the amount of space an object occupies
18.
The independent variable in an experiment is graphed on the ______ axis.
a)
X
b)
Y
19.
The dependent variable in an experiment is graphed on the ______ axis.
a)
X
b)
Y
20.
Cole has a wooden block and when he places it in a tub of water 85% of the block sinks below the water's surface. What is the density of the wood block?
a)
.85 g/ml
b)
1.0 g/ml
c)
.15 g/ml
d)
3.5 g/ml
21.
Toby finds the density of 50 ml of water. It is 1.0 g/ml. He dumps half of the water down the drain. What is the density of the remaining 25 ml of water?
a)
1.0 g/ml
b)
5.0 g/ml
c)
25 g/ml
d)
50 g/ml
22.
If an object sinks in water, its density must be _________.
a)
.3 g/cm
b)
.7 g/cm
c)
.54 g/cm
d)
1.8 g/cm
23.
If an object floats in water, its density must be __________.
a)
1.75 g/cm
b)
2.0 g/cm
c)
0.3 g/cm
d)
3.0 g/cm
24.
If Logan cuts a wooden board in half, its density will _____________.
a)
decrease
b)
increase
c)
stay the same
25.
The ability of a fluid to exert an upward force of an object immersed in it is
a)
viscosity.
b)
buoyancy.
c)
vaporization.
d)
thermal expansion.
26.
According to Pascal, pressure applied to a fluid
a)
increases as it moves through the fluid.
b)
decreases as it moves through the fluid.
c)
fluctuates as it is transmitted throughout the fluid.
d)
is transmitted unchanged throughout the fluid.
27.
Mass per unit volume is
a)
buoyancy.
b)
density.
c)
pressure.
d)
viscosity.
28.

Gravity is a

a)

force that pushes up

b)

force that pushes down

c)

force that pushes up and down

d)

a force that causes something to float

29.

An object will rise up in a fluid if

a)

Gravity and buoyant force equal

b)

Density of object and fluid is equal

c)

the buoyant force is stronger than gravity

d)

if the density of the object is greater than the fluid

30.

An object will float (hover) in a fluid if

a)

Gravity and buoyant force equal

b)

buoyant force is stronger than gravity

c)

if the density of the object is greater than the fluid

d)

If gravity is super strong

31.

An object will sink in a fluid if

a)

gravity is stronger than buoyant force

b)

buoyant force is stronger than gravity

c)

a fluid can be a gas or a liquid

d)

if the object is solid

32.

What is buoyant force?

a)

A downward pushing force that a fluid pushes on an object

b)

A force that causes an object to sink

c)

A upward pushing force that a fluid pushes on an object

d)

The same as gravity

33.
An elephant weighs 6000N. The total area of feet is 0.2m². What is the pressure?
a)
30000 Pa
b)
15000N/m2
c)
1200N
d)
20000Pa
34.
A force of 20 N acts over an area of 4m2. Calculate the pressure
a)
80 Pa
b)
5 Pa
c)
80 N
d)
5 N
35.
Calculate the pressure exerted by the block at the bottom, knowing that its mass is 20000g and its measures are A = 10.0cm, B = 5.0cm, C = 8.0cm
a)
0,4 Pa
b)
25 Pa
c)
250 Pa
d)
20 Pa
36.
Where is pressure the greatest on the dam?
a)
D
b)
C
c)
B
d)
A
37.
The amount of force pushing on an area is the definition of....
a)
Fluid
b)
Viscosity
c)
Barometer
d)
Pressure
38.
Learning Objective 2 - Application of formula for pressure (find p)
a)
A
b)
B
c)
C
d)
D
39.
Learning Objective 2 - Application of formula for pressure (find F)
a)
A
b)
B
c)
C
d)
D
40.
Learning Objective 2 - Visualising pressure in daily life
a)
A
b)
B
c)
C
d)
D
41.
An elephant weighs 6000N. The total area of feet is 0.2m². What is the pressure?
a)
30000 Pa
b)
15000N/m2
c)
1200N
d)
20000Pa
42.
An irregularly shaped piece of gold was lowered into a graduated cylinder holding a volume of water equal to 17 ml. The height of the water rose to 20 ml. If the mass of the gold was 27 g, what was its density?
a)
9 g/mL
b)
10.5 g/mL
c)
6.5 g/mL
d)
8 g/mL
43.
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
a)
2.8g/mL
b)
2.7g/mL
c)
2.66.g/mL
d)
2.5g/mL
44.

A bar of copper has a mass of 216g and a volume of 24 cm3. What is the density of copper?

a)

9g/cm3

b)

5184g/cm3

c)

.11g/cm3

d)

322mL

45.
What two types of measurements make up DENSITY? 
a)
Mass and Volume
b)
Temperature and Mass
c)
Grams and Centimeters
d)
Volume and Weight
46.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
47.
If an object has a density of .6 g/mL and you put it into water, will it sink or float?  
a)
sink
b)
float
48.
Helium balloons rise on earth because
a)
helium is less dense than air
b)
helium is more dense than air
c)
helium is cooler than air
d)
helium is warmer than air
49.

Using the picture, tell me which object is the least dense and why?

a)

The fish because he is in the middle

b)

The cork because it is floating at the top of the water

c)

The rock because it is at the bottom

d)

The cork and the rock because they have the same about of atoms.

50.

Calculate the density of the object below if it has a mass of 3g. (Hint: you need to find the volume.)

a)

60 g/cm3

b)

3 g/cm3

c)

20 g/cm3

d)

0.05 g/cm3

51.
What is the equation used to calculate pressure?
a)
pressure= force/mass
b)
pressure =mass/volume
c)
pressure=area/force
d)
pressure=force/area
52.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
53.
Pressure decreases when the surface area over which a force is applied increases
a)
True
b)
False
54.
Look at the pressure triangle. How do we calculate the area?
a)
f ÷ a
b)
f x p
c)
p x f
d)
f ÷ p
55.
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
a)
40 N/cm2
b)
100 N/cm2
c)
400 N/cm2
d)
10 N/cm2
56.
Which box has a higher density?  
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
57.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1, 
d)
4, 3, 1, 2
58.
The table below lists the densities of five metals. All of the following metals will float in mercury except...
a)
copper
b)
gold
c)
silver 
d)
zinc
59.

According to the picture from left to right, which of the answers is correct?

a)

neurally buoyant, positively buoyant, negatively buoyant

b)

negatively buoyant, neutrally buoyant, positively buoyant

c)

positively buoyant, neutrally buoyant, negatively buoyant

d)

neutrally buoyant, negatively buoyant, positively buoyant

60.
Two liquids are poured out of containers at the same height & time. Liquid 1 empties from the container before liquid 2. Which liquid has a lower viscosity? 
a)
liquid 1
b)
liquid 2
c)
both liquids have the same viscosity
d)
cannot be determined
61.

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

62.

Which graduated cylinder has the highest viscosity

a)

The graduated cylinder with the ball at 20mL.

b)

The graduated cylinder with the ball at 30mL.

c)

The graduated cylinder with the ball at 40mL.

d)

The graduated cylinder with the ball at 50mL.

63.

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

a)

40 °C

b)

60 °C

c)

80 °C

d)

100 °C

64.

Using the particle model of matter, viscosity is described as

a)

the larger the molecules, the higher the viscosity

b)

the greater the distance between the particles, the greater the viscosity

c)

the greater the friction between particles, the greater the viscosity

d)

the faster the particles are moving, the greater the viscosity

65.

The ease with which fluids flow may be described as

a)

viscosity

b)

colloid

c)

buoyancy

d)

density

66.

What is the density of 20 mL of lead that has a mass of 200 g?

a)

10

b)

20

c)

20,4

d)

15.6

67.

If Line C represents the density of distilled water, then Line D could represent the density of

a)

cement block

b)

wood

c)

gold

d)

titanium

68.

What is the density represented by line A

a)

20g/mL

b)

5g/mL

c)

5mL/g

d)

100g/mL

69.

Consider a hot air balloon. Which statement is correct?

a)

when the buoyant force equals the force of gravity, the balloon stops rising

b)

when the balloon is heated, the air particles in the balloon move more slowly

c)

the balloon rises because the buoyant force is less than the force of gravity

d)

as the balloon is heated, it becomes more dense than the surrounding air

70.

According to the Particle Model of Matter, air is a more compressible fluid than a liquid, because

a)

liquid particles are moving at lesser speeds

b)

liquids have more particles per volume

c)

air particles are moving at greater speeds

d)

air has more particles per volume

71.

An average man is 850 N and the area of the shoes he is standing on is 0.0098 m2. What is the approximate pressure he is exerting on the ground?

a)

87,000 N/m2

b)

8,700 N/m2

c)

870 N/m2

d)

87 N/m2

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