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Grade 8 Science Final review
Grade 8 Science Final review
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1
The disadvantage of having to turn a greater distance refers to which simple machine
lever
wheel and axle
pulley
wedge
2
a mechanical mixture is created when
is a gel
you can see the different parts
when a solution is formed
when you cannot see the different parts
3
What percentage of the earths surface is water?
67
97
74
9
4
Cats have ______ eyes, while insects have ______ eyes.
compound, simple
camera, compound
<p>compound, camera</p>
simple, compound
5
This part of detergent attaches to dirt particles and prevent them reattaching to the clothes.
surfactant
builder
bleach
filler
6
The Labrador current is
cold
hot
warm
7
The forces deep within earth led to mountain ranges being formed what evidence demonstrate this
oceanic trenches and volcanic islands
sea mounts
volcanic islands
oceaonic ridges and oceanic trenches
8
when doctor taps your knee and your leg moves, this is called
metabolism
adaptation
jumping
response to a stimulus
9
_______ are the smallest functioning units of life.
<p>Organs</p>
Tissues
<p>Blood</p>
Cells
10
What are uses of reservoirs?
irrigation
all of the choices
drinking water
generation of electricity
11
What does a diamond do to light that allows it to sparkle?
Absorbs
Refracts
Reflects
12
What is neutral buoyancy?
When gravity is less than buoyancy
When gravity equals buoyancy
When gravity is greater than buoyancy
Floating
13
What type of rays can damage the skin and lead to skin cancer
ultraviolet rays
microwaves
infrared waves
radio waves
14
The image below shows a:
Flammable and Combustible Material
<p>Toxic Hazard</p>
Fire
Corrosive Material
15
An example of a colloid is....
slurry
pure substance
milk
salt
16
Which of the following is NOT a property of light:
<p>Light can be reflected</p>
<p>Light travels in zig zags</p>
Light is a form of energy
Light can bend
17
Which parts of the plant are the transport tissue?
<p>Phloem</p>
<p>Xylem</p>
Phloem and Xylem
18
_____ are sensitive to light, while _____ detect color.
rods, cones
cones, rods
19
The number of waves per unit of time is referred to as
wavelength
frequency
amplitude
20
what percent of the Earths fresh water is underground
9
97
73
22
21
How many chambers does the heart have?
2
8
4
6
22
______ is the diffusion of water particles through a selectively permeable membrane.
Osmosis
Mitosis
Diffusion
Permeable
23
the difference between a convex lens and a concave lens is that a
convex lenses spread out light
convex lens is thicker in the middle
concave lens is thicker in the middle
concave lenses bring light together
24
To increase a particles motion:
Increase the size
Heat the material
Decrease the size
<p>Cool the material</p>
25
A normal angle is measured at? (Degrees)
90 Degrees
180 Degrees
0 Degrees
<p>360 Degrees</p>
26
Gears the increase the speed of rotation in a device are called:
Multiplying Gears
Increasing Gears
Reducing Gears
Driving Gears
27
Which is the largest organ in the human body?
Esophagus
<p>Skin</p>
Heart
28
A convex lens is ____________ in the middle compared to a concave lens.
thicker
taller
thinner
shorter
29
Bioluminescence means light producing organisms, this occurs due to....
photophores only
flagella
light bulbs
photphores or bacteria
30
the main reason we use a simple machine is to
move the load a shorter distqance
decrease the force needed to perform a task
increase the force needed to perform a task
move the load a greater distance
31
Silt and mud settle out of a river or stream dut to the speed of the water
changing temperature
increasing
staying the same
decreasing
32
The Hubble Telescope produces better pictures because:
There is atmosphere in space
It has smaller lenses and mirrors
It has larger lenses and mirrors
There is no atmosphere in space
33
A pure substance is:
<p>Is a clear solution</p>
Made up of multiple types of matter
Made up of one type of matter
34
A yellow triangle in a hazard symbol means:
Danger
Caution
Warning
35
An example of a behavioural adaptation would be
birds flying south for the winter
a gibbons long arms
a bird being able to fly
Fish not freezing in the winter because of antifreeze
36
Which of the following is NOT part of the particle model of matter:
<p>Particles may be attracted to each other</p>
Particles are never in motion
Particles have spaces between them
<p>Made up of tiny particles</p>
37
What is a slurry?
<p>Mixture of water and solids</p>
Solids
Water
38
the movement of particles from high concentration to low concentration
metabolism
diffusion
concentration
photosynthesis
39
Machines are never 100% efficient due to
poor workmanship
friction
matrial
heat
40
when cells increase in an organism it results in....
growing
responding
breathing
using energy
41
If a person is having trouble breathing, which of the following should be checked:
Nervous System
Digestive System
Respiratory system
Air System
42
Name the control centre for your whole body:
Brain
Cells
Neurons
Spinal Cord
43
When people refer to the color of their eyes they are refering to:
<p>Pupil</p>
Iris
Cornea
Retina
44
What caused the mountains in waterton and the coulees of lethbridge
erosion and plate tectonics
glaciation and plate tectonics
the wind
volcanic action
45
The ease to which a fluid flows is called its
viscosity
bouyancy
flowness
density
46
_______ is the easiest to compress:
Solid
Gas
Liquid
47
When you heat up a substance the particles.....
move slower and slower
bunch closer together
dont change their speed
move faster and faster
48
Why does a substance dissolve without stirring?
water moves faster than other substances
in cold water the particles move faster
particlesofH2o are attracted to particles of other substance
the water takes the shape of the container
49
Red blood cells do not carry
Carbon Dioxide
oxygen
50
Tides are caused by what
gravity of moon and sun
gravity of earth
water changes
rotation of sun
51
Find the density, when mass=10 and volume=5. (Formula: Density=Mass/Volume)
5
0.5
<p>2.5</p>
2
52
a characteristic that increases a species chances of survival is called
adaptation
development
diversity
osmosis
53
In an ideal device the
MA and SR are not related
<p>MA is greater than SR</p>
MA is less than SR
MA is the same as SR
54
Which of the following is a similarity between waves and light:
Both forms of energy and travel in one direction
Both a form of energy and travel in all directions
Light only is a form of energy
Waves only are a form of energy
55
Abiotic means non -living. Which of the following is not abiotic
chemicals
organisms
organic matter
minerals
56
the removal of metabolic wastes is called
none of the above
excretion
digestion
metabolism
57
The fog in Newfoundland is in part due to the
cold gulf stream
Cold Labrador current
warm Labrador current
Warm gulf stream
58
What does "1" represent?
Frequency
Amplitude
Wavelength
59
What is the function of a microscope?
decorate the science classroom
see in outer space
magnifiy tiny objects
see distant objects clearly
60
The WHMIS symbol below is:
Flammable
<p>Toxic Hazard</p>
Combustible Material
Caution
61
What 2 practices result in discharge of water into streams and lakes?
run off and power stations
run off and factories
factories and sewage
power stations and factories
62
A disadvantage of an inclined plane is:
It can only be used in one direction
Must move the load a greater distance
You must turn a greater distance
63
what process traps the suns energy and converts it to chemical energy
photosynthesis
chloroplast
cellular respiration
tides
64
Where did Moraines form?
from deposits of melt water
at the back of glaciers
at the start of glaciers
at the edges of glaciers
65
what is the purpose of bleach
clean clothes
soften water
remove stains
for clothes to smell nice
66
Function of red blood cells in your body is to:
Carry Carbon Dioxide to all the cells
Carry oxygen to all the cells
Carry heat to all the cells
67
The plimsoll line on a ship indicates
the temperature of the water
how fast it can go
how to safely load a ship
how powerful the engine is
68
What causes the bends?
runs out of oxygen in their tank
diver ascends from the bottom too fast
goes too deep underwater
diver descends to the bottom too fast
69
What does i represent?
Angle of Incidence
Angle of Reflection
Angle of Refraction
70
When light passes through a concave lens, the light rays:
Converge
Diverge
71
a series of different sized gears working together refers to a
driving gear
gear train
<p>transmission</p>
driven gear
72
the storage room of a cell
chloroplast
mitochondria
vacuole
nucleus
73
The dissadvantage of exerting a force over a greater distance than the load refers to a
lever
screw
inclined plane
wheel and axle
74
In order to increase the speed of rotation in a gear system
the driving gear must be larger than the driven gear
the 2 gears must be the same size
the driving gear must be smaller than the driven gear
75
If you removed the surfactant from the detergent your clothes would....
get clean but have stains
remain dirty
remain dirty but smell nice
clean the laundry machine
76
The continental divide is located between
Alberta and USA
Alberta and BC
foothills and mountains
Alberta and Saskatchewan
77
What does r represent?
Angle of Refraction
Angles of Incidence
Angle of Reflection
78
When a chameleon changes its skin color to blend into its environment we call this
reproduction
adaptation
stimulus
diversity
79
Starfish are found in a
Estuary
oceanic zone
continental shelf
intertidal zone
80
Why do we have shadows?
light is absorbed and blocked by the object
light goes through the object
light bends around objects
81
Particles move the most in a substance that is
cold gas
hot solid
cold solid
hot gas
82
The gulf stream is
cold
warm
hot
83
objects sink when
bouyant force is equal to force of gravity
bouyant force is less than force of gravity
bouyant force is grater than force of gravity
Neutral bouyacy
84
The heart circulates blood through how many seperate loops?
3
2
4
8
85
One of the first tools ever used was: (Mechanical Systems)
Lever
Ramp
<p>Pulley</p>
Wheel and Axel
86
What forms of matter takes the shape of its container:
<p>Liquid</p>
Solid
Gas and Liquid
Gas
