Font size
S
M
L
XL
Worksheets8th grade final 2017
Total questions: 112
Worksheet time: 56mins
Name
Class
Date
1.
What skill is a scientist using when she listens to the sound that whales make?
a)
making hypothesis
b)
making observations
c)
interpreting data
d)
drawing conclusions
2.
Which of the following is NOT a rule when writing a hypothesis?
a)
It is testable
b)
It is a prediction
c)
It is an if/then statement
d)
It should restate the questions
3.
An experiment that tests only one factor at a time by using a comparison of a control group and an experimental group is?
a)
a dependent variable
b)
an independent variable
c)
a theory
d)
a controlled experiment
4.
Which of the following hypotheses is written correctly?
a)
If a tennis ball is frozen, it won't bounce as high as one that is frozen.
b)
If I freeze a teniis ball, then it will not bounce as high because it is not as elastic.
c)
If I heat up a tennis ball it will bounce high.
d)
Frozen tennis balls will not bounce as high.
5.
The process of obtaining information by using the sense is called a/an
a)
scientific method
b)
conclusion
c)
inquiry
d)
observation
6.
A series of steps designed to help you solve problems and answer questions
a)
observation
b)
scientific method
c)
experiment
d)
hypothesis
7.
In an experiment, the onvariable that is change is called the
a)
independent
b)
dependent
c)
experimental
d)
control
8.
In an experiment the factor that we measure is called the
a)
controlled
b)
independent
c)
conclusion
d)
dependent
9.
A scientist hypothesizes the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The independent variable is
a)
the gender of the alligator
b)
the temperature
c)
the male alligator
d)
the incubator
10.
A scientist hypothesizes the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The dependent variable is
a)
the gender of the alligator
b)
the temperature
c)
the male alligator
d)
the incubator
11.
A scientist conducted an experiment to determine how the amount of salt in a body of water affects the number of plants that can live in the water. In this experiment the independent variable is
a)
the water
b)
the number of plants in the water
c)
the temperature of the water
d)
the amount of salt in the water
12.
A scientist conducted an experiment to determine how the amount of salt in a body of water affects the number of plants that can live in the water. In this experiment the dependent variable is
a)
the water
b)
the number of plants in the water
c)
the temperature of the water
d)
the amount of salt in the water
13.
All the things in an experiment that must be the same to make it fair are called
a)
controlled variables or constants
b)
dependent variables
c)
controlled experiments
d)
independent variables
14.
In science, an educated guess is called a/an
a)
observation
b)
conclusion
c)
question
d)
hypothesis
15.
When you decide whether or not the data supports the original hypothesis, you are
a)
drawing conclusions
b)
asking questions
c)
forming a hypothesis
d)
making observations
16.
When a scientists shares her findings with other scientists she is
a)
experimenting
b)
analyzing data
c)
communicating results
d)
making a hypothesis
17.
In which step of the scientific method do we want to use graphs
a)
analyze data
b)
communicate results
c)
asking questions
d)
making a hypothesis
18.
A scientist who wants to study the effect of fertilizer on plants sets up an experiment. Plant A gets no fertilizer, Plant B gets 5mg of fertilizer each day, and Plant C gets 10mg of fertilizer each day. Which plant is the control group?
a)
Plant A
b)
Plant C
c)
all of them
d)
Plant B
19.
a place or an object is the location of that place or object
a)
position
b)
reference point
c)
motion
d)
speed
20.
a location to which you compare other locations is called
a)
position
b)
reference point
c)
motion
d)
speed
21.
the change of position over time
a)
velocity
b)
reference point
c)
motion
d)
speed
22.
a measure of how fast something moves or the distance it moves, in a given amount of timem
a)
velocity
b)
vector
c)
motion
d)
speed
23.
a speed in a specific direction
a)
velocity
b)
vector
c)
acceleration
d)
speed
24.
a quantity that has been both size and direction
a)
velocity
b)
vector
c)
acceleration
d)
speed
25.
the rate at which velocity changes with time
a)
velocity
b)
vector
c)
acceleration
d)
speed
26.
a push or pull
a)
force
b)
net force
c)
Newton's 1st Law
d)
Newton's 2nd Law
27.
overall force acting on an object when all the forces are combined
a)
force
b)
net force
c)
Newton's 1st Law
d)
Newton's 2nd Law
28.
states that objects at rest remain at rest and objects in motion remain in motion with the same velocity unless acted upon by an unbalanced force
a)
Newton's 3rd Law
b)
net force
c)
Newton's 1st Law
d)
Newton's 2nd Law
29.
states that the acceleration of an object increases with increased force and decreases with increased mass
a)
Newton's 3rd Law
b)
Inertia
c)
Newton's 1st Law
d)
Newton's 2nd Law
30.
states that every time one object exerts a force on another object, the second object exerts a force that is equal in size and opposite in direction back on the first object
a)
Newton's 3rd Law
b)
Inertia
c)
centripetal force
d)
Newton's 2nd Law
31.
the resistance of an object to a change in the speed or the direction of its motion its motion
a)
Newton's 3rd Law
b)
Inertia
c)
centripetal force
d)
momentum
32.
any force that keeps an object moving in a circle is known as
a)
collision
b)
Inertia
c)
centripetal force
d)
momentum
33.
a measure of mass in motion the momentum of an object is the product of its mass and its velocity
a)
collision
b)
conservation of momentum
c)
centripetal force
d)
momentum
34.
a situation in which two objects in close contact exchange energy and momentum
a)
collision
b)
conservation of momentum
c)
centripetal force
d)
momentum
35.
states that the total momentum of a system of objects does not change, as long as no outside forces are acting on that system
a)
collision
b)
conservation of momentum
c)
centripetal force
d)
momentum
36.
the use of force to move an object some distance
a)
work
b)
joule
c)
potential energy
d)
kinetic energy
37.
when you multiply a force in newtons times a distance in meters, the product is a measurement called
a)
work
b)
joule
c)
potential energy
d)
kinetic energy
38.
is stored energy, or the energy an object has due to its position or its shape
a)
mechanical energy
b)
joule
c)
potential energy
d)
kinetic energy
39.
the energy of motion
a)
mechanical energy
b)
conservation of energy
c)
potential energy
d)
kinetic energy
40.
the energy possessed by an object due to its motion or position
a)
mechanical energy
b)
conservation of energy
c)
power
d)
kinetic energy
41.
Energy can neither be created nor destroyed; rather, it transforms from one form to another.
a)
mechanical energy
b)
law of conservation of energy
c)
power
d)
watt
42.
the rate at which you do work
a)
horsepower
b)
conservation of energy
c)
power
d)
watt
43.
the unit of measurement for power
a)
horsepower
b)
conservation of energy
c)
power
d)
watt
44.
amount of work a horse can do in a minute
a)
horsepower
b)
conservation of energy
c)
power
d)
watt
45.
any device that helps people do work
a)
machine
b)
mechanical advantage
c)
efficiency
d)
simple machine
46.
the number of times a machine multiplies the input force is called the machine's
a)
machine
b)
mechanical advantage
c)
efficiency
d)
simple machine
47.
the ratio of its output work to the input work
a)
lever
b)
mechanical advantage
c)
efficiency
d)
simple machine
48.
the six machines on which all other mechanical machines are based
a)
lever
b)
fulcrum
c)
efficiency
d)
simple machine
49.
a solid bar that rotates, or turns , around a fixed point
a)
lever
b)
fulcrum
c)
wheel and axle
d)
simple machine
50.
a fixed point is called
a)
lever
b)
fulcrum
c)
wheel and axle
d)
pulley
51.
a simple machine made of a wheel attached to a shaft, or axle
a)
inclined plane
b)
fulcrum
c)
wheel and axle
d)
pulley
52.
a wheel with a grooved rim and a rope or cable that rides in the groove
a)
inclined plane
b)
fulcrum
c)
wheel and axle
d)
pulley
53.
a simple machines that is a sloping surface
a)
inclined plane
b)
wedge
c)
wheel and axle
d)
pulley
54.
a simple machine that has a thick end and a thin end
a)
inclined plane
b)
wedge
c)
wheel and axle
d)
screw
55.
an inclined plan wrapped around a cylinder or cone to form a spiral
a)
inclined plane
b)
wedge
c)
wheel and axle
d)
screw
56.
a machine that is made of two or more simple machines
a)
inclined plane
b)
wedge
c)
compound machine
d)
screw
57.
is a disturbance that transfers energy from one place to another
a)
wave
b)
medium
c)
mechanical wave
d)
transverse wave
58.
any substance that a wave moves through
a)
wave
b)
medium
c)
mechanical wave
d)
transverse wave
59.
waves that transfer energy through matter
a)
longitudinal wave
b)
medium
c)
mechanical wave
d)
transverse wave
60.
the direction in which the wave travels is perpendicular or at right angles to the direction of the disturbance
a)
longitudinal wave
b)
crest
c)
mechanical wave
d)
transverse wave
61.
the wave travels in the same direction as the disturbance
a)
longitudinal wave
b)
crest
c)
trough
d)
transverse wave
62.
the highest point or peak of a wave
a)
longitudinal wave
b)
crest
c)
trough
d)
amplitude
63.
the lowest point or valley of a wave
a)
wavelength
b)
crest
c)
trough
d)
amplitude
64.
the distance between a line through the middle of a wave and a crest or trough
a)
wavelength
b)
crest
c)
trough
d)
amplitude
65.
the distance from one wave crest to the very next crest is called
a)
wavelength
b)
frequency
c)
trough
d)
amplitude
66.
the number of wavelengths passing a fixed point in a certain amount of time is called
a)
wavelength
b)
frequency
c)
reflection
d)
amplitude
67.
the bouncing back of a wave after it strikes a barrier
a)
wavelength
b)
frequency
c)
reflection
d)
amplitude
68.
the bending of a wave as it enters a new medium at an angle other than 90 degrees
a)
wavelength
b)
frequency
c)
reflection
d)
refraction
69.
the spreading out of waves through an opening or around the edge of an obstacle
a)
diffraction
b)
frequency
c)
reflection
d)
refraction
70.
the meeting and combining of waves
a)
diffraction
b)
interference
c)
reflection
d)
refraction
71.
a closed path through which a contnuous charge can flow
a)
circuit
b)
resistor
c)
series circuit
d)
parallel circuit
72.
is an electrical device that slows the flow of charge in a circuit
a)
circuit
b)
resistor
c)
series circuit
d)
parallel circuit
73.
a circuit in which current follows a single path
a)
conductor
b)
resistor
c)
series circuit
d)
parallel circuit
74.
is a circuit in which current follows more than one path
a)
conductor
b)
insulator
c)
series circuit
d)
parallel circuit
75.
materials that allow electrical current to flow through with little or no resistance
a)
conductor
b)
insulator
c)
load
d)
parallel circuit
76.
materials that do not allow electrons to pass through
a)
conductor
b)
insulator
c)
load
d)
parallel circuit
77.
Maria walked 2 km in half an hour. What was her average speed during her walk?
speed = distance/time
speed = distance/time
a)
1
b)
2
c)
6
d)
4
78.
Mary and Keisha run with the same constant speed but in opposite directions. The girls have
a)
the same position
b)
different accelerations
c)
different speeds
d)
different velocities
79.
A swimmer increases her speed as she approaches the end of the pool. Her acceleration is
a)
in the same direction as her motion
b)
in the opposite direction of her motion
c)
at right angles to her motion
d)
zero
80.
A cheetah can go from 0 m/s to 20 m/s in 2s. What is the cheetah's acceleration? acceleration = final velocity - initial velocity/time
a)
5
b)
10
c)
20
d)
40
81.
Jon walks for a few minutes, then runs for a few minutes. During this time, his average speed is
a)
the same as his final speed
b)
greater than his final speed
c)
less than his final speed
d)
zero
82.
A car traveling at 40 m/s slows down to 20 m/s. During this time, the car has
a)
no acceleration
b)
positive acceleration
c)
negative acceleration
d)
constant velocity
83.
Newton's second law states that to increase acceleration you
a)
increase force
b)
increase mass
c)
decrease force
d)
increase inertia
84.
What units are used to measure force?
a)
kilograms
b)
newtons
c)
meters
d)
seconds
85.
A wagon is pulled down a hill with a constant velocity. All the forces on the wagon are
a)
balanced
b)
increasing
c)
unbalanced
d)
decreasing
86.
An action force and reaction force are
a)
equal in size and direction
b)
equal in size and opposite in direction
c)
different in size but in the same direction
d)
different in size and in direction
87.
Work can be calculated from
a)
force and speed
b)
force and distance
c)
energy and time
d)
energy and distance
88.
If you balance a book on your head, you are not doing work on the book because
a)
doing work requires moving an object
b)
you are not applying any force to the book
c)
the book is doing work on you
d)
the book has potential energy
89.
Energy that an object has because of its position or shape is called
a)
potential energy
b)
kinetic energy
c)
thermal energy
d)
chemical energy
90.
The unit that measures one joule of work in one second is called a
a)
meter
b)
watt
c)
newton-meter
d)
newton
91.
By increasing speed at which you do work, you increase your
a)
force
b)
energy
c)
work
d)
power
92.
A ball kicked into the air will have the greatest gravitational potential energy
a)
as it is being kicked
b)
as it starts rising
c)
as its highest point
d)
as it hits the ground
93.
Machines help you work by
a)
decreasing the amount of work that must be done
b)
changing the size and/or direction of a force
c)
decreasing friction
d)
conserving energy
94.
To calculate mechanical advantage, you need to know
a)
time and energy
b)
input force and output force
c)
distance and work
d)
size and direction of a force
95.
A machine in which the input force has a mechanical advantage of
a)
0
b)
1
c)
between 0 and 1
d)
more than 1
96.
You may increase a machine's efficiency by
a)
increasing force
b)
reducing work
c)
increasing distance
d)
reducing friction
97.
Levers turn around a
a)
fixed point called a fulcrum
b)
solid bar that rotates
c)
wheel attached to an axle
d)
sloping surface called an inclined plane
98.
When you bite into an apple, your teeth act as what kind of simple machine?
a)
lever
b)
pulley
c)
wedge
d)
screw
99.
The direction in which a transverse wave travels is
a)
in the same direction as the distrubance
b)
toward the disturbance
c)
from the disturbance downward
d)
at right angles to the disturbance
100.
An example of a longitudinal wave is
a)
water wave
b)
stadium wave
c)
sound wave
d)
rope wave
101.
Which statement best defines a water medium?
a)
the material through which a wave travels
b)
a point half-way between the crest and trough of a wave
c)
the disturbance from one wave crest to the next
d)
the speed at which waves travel in water
102.
As you increase the amplitude of a wave, you also increase the
a)
frequency
b)
wavelength
c)
speed
d)
energy
103.
To identify the amplitude in a longitudinal wave, you would look for areas of
a)
reflection
b)
compression
c)
crests
d)
refraction
104.
Which statement describes the relationship between frequency and wavelength
a)
when frequency increase, wavelength increases
b)
when frequency increases, wavelength decreases
c)
when frequency increases, wavelength remains constant
d)
when frequency increases, wavelength varies unpredictably
105.
For wave refraction to take place, a must
a)
increase in velocity
b)
enter a new medium
c)
increase in frequency
d)
merge with another wave
106.
Which setup in a wave tanl would enable you to demonstrate diffraction?
a)
water only
b)
water and sand
c)
water and food coloring
d)
water and a barrier with a small gap
107.
Two waves come together and interact to form a new, smaller wave. This process is called
a)
destructive interference
b)
constructive interference
c)
reflective interference
d)
positive interference
108.
Current always follows
a)
a path made of wire
b)
a path containing an electrical device
c)
a closed path
d)
an open circuit
109.
When you open a switch in a circuit, you
a)
form a closed path for current
b)
reverse the current
c)
turn off its electrical devices
d)
turn on its electrical devices
110.
Which one of the following parts of a circuit changes electrical energy into another form of energy?
a)
resistor
b)
conductor
c)
base
d)
voltage source
111.
A circuit breaker is a safety device that
a)
must be replaced after each use
b)
has a wire that melts
c)
supplies voltage
d)
stops the current
112.
What happens when more than one voltage source is added to a a circuit in series?
a)
the voltages are added together
b)
the voltages cancel each other out
c)
the voltages are multiplied together
d)
the voltage of each source decreases
Reset
