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WCAS 8th Grade Review
WCAS 8th Grade Review
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prepare for 8th grade science WCAS Test
Flashcards
55 cards
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Practice quiz
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Host live
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Questions
55
Answers
1
An organism that feeds off of another organism, in order to survive(e.g., tick, flea, tapeworm)
predator
parasite
host
prey
2
underwater Trenches are caused by
transform
subduction
divergent
convergent
3
The number of electrons in the last shell of an atom is called what
nucleus
group
valence
period
4
What are potential costs (downsides) of mining minerals/fossil fuels?
Mining is not actually economically profitable
Mined resources are nonrenewable
Water contamination in mined areas
Mined materials may be toxic/destructive to Earth systems
5
Fossil record and rock correlation support this theory
continental drift
newton's laws
plate tectonics
evolution
6
When you design an engineering solution, how do you know if your design is successful?
I take a survey to see if people think it looks cool
I test it once and declare success or failure based on that
I make sure to check all boxes on the worksheet
I write test criteria, then test to see if it meets them
7
Which type of galaxy is shown below?
irregular
round
spiral
elliptical
8
Sun is a medium-sized star near the edge of a disc-shaped galaxy of stars
False
True
9
An object at rest stays at rest until an unbalanced force acts on it, which law is this?
2nd
1st
3rd
10
You are in a car driving and the breaks are applied, you fly forward, which Law is this?
Law of Action-Reaction
Law of Force and Acceleration
Law of Inertia
Newton's 2nd Law
11
What are ways that climate can impact human activity?
Climate does not impact human activity
Different atmospheric gases make asteroid impact more likely
Changing sea levels affect safety of coastal communities
Changing precipitation impacts growth of crops
12
The mass of an atom is the combination of which two particles
proton and nucleus
proton and neutron
electron and proton
electron and neutron
13
Satellites move at a constant speed around celestials bodies due to which law
3rd
2nd
1st
14
In the equation 3H
2
O, the number 2 is called what
atomic number
atomic mass
subscript
coefficient
15
Which particle is found in the cloud
protons
electrons
nucleus
neutrons
16
Which of Newton's Law is responsible for lift off of the space shuttle?
Newton's 2nd Law
Newton's 3rd Law
Newton's 1st Law
17
the formation of solids from a solution
precipitate
freezing
melting
solidification
18
a system of stars and associated matter, held together by gravitational attraction
universe
solar system
Moon
galaxy
19
The mass (g) of substances in the reactants is equal to the mass of substances in the
subscript
equation
products
coefficient
20
Elements in the same period have the same number of what
valence electrons
energy levels
protons
neutrons
21
If the woman in the picture does not move is work being done?
No
Yes
22
When plate boundaries form mountains this is an example of which boundary?
transform
convergent
subduction zone
divergent
23
This crustal feature was done to prevent which of the following processes
extinction
weathering
erosion
deposition
24
True or false: Earth's climate & average temperatures have been constant throughout its history
True
False
25
What is the first step in the Engineering Design Process?
Research Solutions
Design Multiple Solutions & Select One
Define the Problem
Build a Prototype
26
Law of conservation of mass states
matter is not created
Matter is created
matter is destroyed
matter is neither created or destroyed
27
Which subatomic particle has a positive charge?
neutron
electron
proton
nucleus
28
tendency of a substance to undergo chemical changes in a system
metal
reactivity
conductor
frequency
29
Volcanoes are caused by which plate tectonic boundary
divergent
convergent
transform
30
Which of the following is an example of a chemical change?
bubbles forming
crushing almonds
cutting a watermelon
food coloring in water
31
A neutron has which charge
positive
no charge
negative
32
Used for measuring the intensity of the energy of celestial objects
x rays
radio waves
light waves
microwaves
33
What was the name of the super-continent which existed on Earth about 175 million years ago?
Faerun
Gondwana
Pangea
Australasia
34
Which change would cause rocks from Earth's mantle (solid) to melt into magma (liquid)?
Reduced pressure, increase in water content
Increased pressure, reduced temperature
The Scientific Method.
Decreased water content, decreased temperature
35
How many hydrogen are found in this molecule? (NH
4
)
2
CO
3
6
8
4
9
36
Reactivity increases from left to right in a period
true
false
37
How do the Water Cycle and Rock Cycle interact?
Rocks carry water vapor up into the atmosphere
Water is removed from the upper atmosphere by the solar wind
Water enters the mantle, helping form igneous rock
Water weathers, erodes, and deposits rock as it moves
38
The smallest unit of life is the
nucleus
organism
atom
cell
39
Clouds of gas and dust. Sites of star formation. Remains of dead or dying stars
galaxy
comet
black hole
nebulae
40
97% of Earth's water is...
Polluted
Saline; contained in oceans
Fresh; contained in rivers
Frozen; contained in ice caps/glaciers
41
What is an allele?
A type of pharmaceutical made from a rare plant
A rogue planet traveling through the galaxy with no sun
A pair of genes which combine to produce a trait
Another word for a hypothesis
42
Why did Pangea break up?
Greenhouse gases
Divergent plate boundaries
Mass extinction of dinosaurs & other animals
Giant asteroid impact
43
distance light can travel in a vacuum in one year; equal to approximately 9.5 X 10
12
km
visible light
light year
galaxy
acceleration
44
Objects in space, made of gases, which produce their own light and heat
star
nebulae
planet
galaxy
45
In oceanic subduction zones, what's the main contributor to the melting of oceanic crust?
Subterranean rock men are trying to attack us
Increased depth within the mantle
Friction between the plates increases heat
Radioactive elements in the subducting plate increase heat
46
Which form of energy is used to power the vehicle?
mechanical energy
thermal energy
chemical energy
solar energy
47
Genetically altering the DNA of a plant or animal is called
selective breeding
natural selection
evolution
alternation of generation
48
What evidence do we have for the human causes of climate change?
Increase in global temperatures + increase in oil/coal use
Decreasing average human lifespans
Historical record shows intentional climate change in 1800s
Sharp increases in CO2 levels in recent glacial ice
49
What is the single biggest contributor to weathering on Earth's surface?
Wind
Water
Fire
Gravity
50
The following organisms are producers because they contain which unique organelles
cell membrane and chloroplasts
cell wall and nucleus
cell wall and chloroplast
chloroplast and mitochondrion
51
The valence electron number determines which of the following
proton number
similar characteristics
identity
size of the atom
52
What are pieces of evidence for the Big Bang theory?
Knowledgeable scientists believe that it's true
Cosmic background radiation coming from all directions
All distant galaxies are moving away at high speed
The Earth appears to be about 4.5 billion years old
53
When speed is combined with direction it is called which of the following
acceleration
velocity
constant speed
distance
54
fill in the blank convergent means _________
colliding
dividing
sliding
subduction
55
This is an eclipse but it could also be which moon phase?
first quarter
third quarter
new
full
