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1st Nine Weeks Exam(8th)

Total questions: 160

Worksheet time: 2hrs 12mins

Name
Class
Date
1.

SC.7.N.1.2

Scientists frequently repeat the experiments of others scientists. Why is this important in science?


a. Scientists often ask each other for help in performing experiments.

b. Replication of experiments helps to confirm and verify results.

c. Scientists frequently perform other scientists’ experiments in order to practice their technique.

d. Repeating experiments is an effective way to make sure a laboratory is in optimal condition.

a)

a

b)

b

c)

c

d)

d

2.

SC.7.N.1.2

Cara read an article on why repetition and replication are so important, but she did not understand the difference between them. Which of the following best explains the two terms?


a. Repetition is when a scientist repeats an experiment; replication is when a scientist conducts an experiment on genetic material.

b. Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment.

c. Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results.

d. Repetition is when a scientist commits an error in an experiment the first time and must repeat it; replication is when a scientist repeats an experiment to make sure it is valid.

a)

a

b)

b

c)

c

d)

d

3.

SC.6.N.1.2

Experiments are often repeated many times by the same or different scientists. What is the most important reason more than one scientist should conduct an investigation using the same methods?


a. If the results are the same, replication of the investigation helps to confirm the results.

b. The competition makes the scientists work more carefully.

c. More than one scientist is interested in the problem.

d. Different scientists might perform the experiment differently.

a)

a

b)

b

c)

c

d)

d

4.

What is the BEST reason you always repeat an experiment?

a)

Make sure your data is consistent and accurate

b)

Make sure your data supports your prediction

c)

Make sure your experiment is easy to do

d)

Make sure your experiment has lots of data

5.

When doing an experiment Mrs. Blackman says you should always take careful notes. You were sick and tired of Mrs. Blackman telling you what to do so you didn't take careful notes. In the end Mrs. Blackman is always right and your experiment was a disaster. What do you think went wrong with your experiment since you didn't take careful notes?

a)

Mrs. Blackman gave you a bad grade

b)

You have to take detailed notes so that your experiment can be repeated

c)

Detailed notes let others know that you did an experiment

d)

Detailed notes are important so that you can change data

6.

Replication is when one scientist

a)

copies another scientist's experiment.

b)

laughs at another scientist's experiment.

c)

repeats their own experiment several times.

d)

clones another scientist.

7.

Repetition is when one scientist

a)

copies another scientist's experiment.

b)

bumps into another scientists.

c)

repeats their own experiment several times.

d)

clones a T. rex.

8.
Newton’s third law of motion states that for every action there is an equal and opposite reaction. How does this law differ from a theory?
a)
A theory explains a set of well tested observations; a law describes a pattern in nature.
b)
Laws can be changed with the addition of new evidence but theories cannot.
c)
A law explains a pattern in nature in more detail than a theory. 
d)
Theories are based on more evidence than laws.
9.
The independent variable is the ONE thing you _____.
a)
change on purpose
b)
control or keep constant
c)
measure
10.

The variable that is being measured or observed is called the _______________. Hint: this is the variable that is the result or effect

a)

independent variable

b)

dependent variable

c)

control variable

11.

What is a constant/control in an experiment?

a)

Things that do not change in a experiment. It's the variable that stays the same. You can have many variables stay the same.

b)

It's the variables that the scientist changes in the experiment

c)

It's the variables that are being measured in an experiment

12.
What is being changed in this experiment?
a)
ramp height
b)
the speed that the ball rolls
c)
type of ball
13.
A series of steps used by scientists to solve a problem or answer a question. 
a)
scientific method
b)
recipe
c)
data collection
d)
metric system
14.
Newton’s third law of motion states that for every action there is an equal and opposite reaction. How does this law differ from a theory?
a)
A theory explains a set of well tested observations; a law describes a pattern in nature.
b)
Laws can be changed with the addition of new evidence but theories cannot.
c)
A law explains a pattern in nature in more detail than a theory. 
d)
Theories are based on more evidence than laws.
15.

What step does every scientific experiment begin with?

a)

hypothesis

b)

question/problem

c)

procedures

d)

conclusion

16.

The relationship between mass and volume is referred to as...

a)

density

b)

solubility

c)

malleability

d)

electrical conductivity

17.

The ability of a substance to dissolve is referred to as...

a)

density

b)

solubility

c)

malleability

d)

electrical conductivity

18.

A change in the form of a substance that does not change its identity is referred to as a...

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

19.

A characteristic that can be observed or measured such as color, state, or hardness is referred to as a...

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

20.

If you poured three liquids (that do not mix completely) into a cup, how could you tell which one is the densest liquid?

a)

The liquid that is floating on top is the densest liquid.

b)

The liquid that settles to the bottom is the densest liquid.

c)

The liquid with the deep red color is the densest liquid.

d)

There is no way to tell which liquid is densest from the description.

21.

Which of the following is NOT an example of a physical change?

a)
b)
c)
d)
22.

What kinds of changes in substances are always physical changes?

a)

changes of state from solid to liquid to gas and back

b)

changes that result in new substances being formed

c)

changes that alter the identity of the substances

d)

changes that alter the density of the substances

23.

When the temperature of matter increases the particles (usually)...

a)

speed up and move closer

b)

speed up and move farther apart

c)

slow down and move closer together

d)

slow down and move farther apart

24.
No Definite Shape and No Definite Volume
a)
Gas
b)
Liquid
c)
Solid
25.
Definite shape and a definite volume.
a)
Gas
b)
Liquid
c)
Solid
26.
No definite shape, but has a definite volume
a)
Gas
b)
Liquid
c)
Solid
27.
Phase change from a solid to a liquid.
a)
melting
b)
sublimation
c)
boiling
d)
condensation
28.

A force is ____.

a)

a push or pull that can cause movement

b)

a magnet

c)

when someone does not work

29.

This is an example of _____.

a)

magnetism

b)

gravity

c)

work

30.
What are balanced forces?
a)
Forces in the same direction
b)
Forces of the same size
c)
forces of the same size in opposite directions
31.
The force that opposes the motion of two surfaces sliding past each other is called ___________.
a)
acceleration
b)
inertia
c)
friction
d)
unbalanced
32.
What is the unit of force?
a)
Kilogram
b)
Meter
c)
Pascal
d)
Newton
33.
What type of force?
a)
Magnetic
b)
Gravitational
c)
Applied
d)
Normal
34.
What force brings the pencil down?
a)
Applied
b)
Magnetic
c)
Normal
d)
Gravitational
35.
An _______ force must act on an object for it to CHANGE it's motion
a)
balanced
b)
unbalanced
c)
gravitational
d)
electrical
36.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
37.
A north pole and a south pole will attract.
a)
True
b)
False
38.

If the net force is equal to zero, the forces acting on the object are

a)

balanced

b)

unbalanced

39.

A force has both strength and _____.

a)

power

b)

direction

c)

color

d)

balance

40.
When Izzy and Zoe pull on the rope with the same amount of force, the forces are ________.
a)
increased
b)
unbalanced
c)
balanced
d)
decreased
41.
A wheeled cart is moving to the right at a constant speed.  Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?
a)
Balanced Forces, Constant Speed
b)
Balanced Forces, Acceleration
c)
Unbalanced Forces, Constant Speed
d)
Unbalanced Forces, Acceleration
42.
Which could be an example of a balanced force?
a)
An asteroid moving at a constant speed through space 
b)
A car accelerating from a stop sign
c)
A box of dishes falling from a counter 
d)
A rocket taking off 
43.
Which could be an example of a balanced force?
a)
An asteroid moving at a constant speed through space 
b)
A car accelerating from a stop sign
c)
A box of dishes falling from a counter 
d)
A rocket taking off 
44.

Which of the following objects will experience an unbalanced force?

a)

A bike rider on a smooth and level road, pedaling at a constant rate.

b)

A train pulling on another train, each with the same amount of force.

c)

A chair sitting on the floor with balanced forces acting in opposite directions.

d)

A ball rolling across the floor with friction acting in the opposite direction.

45.
If these teams are pulling with the same amount of force what will happen?
a)
The boy in blue will win.
b)
They will not move at all.
c)
The boy in red will win.
d)
Both will fall down.
46.
How will this object move? 
a)
It won't move. 
b)
It will move to the right. 
c)
It will move to the left. 
d)
It will move up. 
47.
What is the formula to calculate speed?
a)
S = t/d
b)
S = d/t
c)
S = d x t
d)
S = t x d
48.
Which of the following is a unit of time?
a)
sec
b)
mi
c)
m/s
d)
km
49.
Which of the following is a unit of speed ?
a)
sec
b)
mi
c)
m/s
d)
min
50.
Which of the following is a unit of distance ?
a)
miles/hr
b)
mi
c)
s
d)
min
51.
Which of the following is a unit of time?
a)
km/hr
b)
hr
c)
km
d)
mi
52.
What is happening at D?
a)
Stationary
b)
Accelerating
c)
Fast steady speed; moving away from the starting position
d)
Slower steady speed; moving away from the starting position
53.
What is happening at A?
a)
Stationary
b)
Accelerating
c)
Slower steady speed; moving away from the starting position
d)
Steady speed; returning to start position
54.
Which runner won the race?
a)
A
b)
B
c)
C
55.
How long did it take this object to travel 10 m?
a)
0 s
b)
10 s
c)
15 s
d)
20 s
56.
How long did it take this object to travel 10 m?
a)
0 s
b)
10 s
c)
15 s
d)
20 s
57.
How long did it take this object to travel back to its reference/starting point?
a)
20 s
b)
30 s
c)
60 s
d)
100 s
58.
At 60 seconds, how far had this object traveled? 
a)
0 m
b)
10 m
c)
20 m
d)
40 m
59.
What does this graph represent?
a)
Constant speed
b)
Acceleration
c)
Not moving
60.
How many times does this object STOP moving?
a)
None
b)
Once
c)
Twice
d)
Three times
61.
How fast is the object traveling between points B and C?
a)
1 km/hr
b)
0 km/hr
c)
There is no way to tell from this graph
d)
0.9 km/hr
62.
During what segments is the object returning to the reference point?
a)
A to B
b)
B to C
c)
C to D
d)
D to E
63.
What is the speed of this object at 3 seconds?
a)
5 m/s
b)
45 m/s
c)
5 s/m
d)
45 s/m
64.
How long did it take Charlie to finish the race?
a)
A)14 meters  
b)
B)12 seconds
c)
C)16.5 seconds
d)
 D)14 seconds 
65.
How far did they run?
a)
A)100 seconds  
b)
B)100 meters
c)
C)18 meters 
d)
D)18 seconds
66.
What does the flat line mean for Charlie?
a)
He stayed at the same speed
b)
He slowed down
c)
He stopped running 
d)
He stayed at the same speed but at a slower rate
67.
a)

Fast

b)

Slow

68.
a)

Fast

b)

Slow

c)

Stopped

69.

Who's Faster?

a)

Barkus

b)

Arctica

70.

Why did Arctica lose the race?

a)

She stopped

b)

She ran too slow

71.
a)

Speeding Up

b)

Slowing Down

72.
a)

Speeding Up

b)

Slowing Down

73.
What does this graph represent?
a)
Constant Speed
b)
Acceleration
c)
Not moving
74.
What two measurements are necessary for calculating speed?
a)
Mass and time
b)
Temperature and mass
c)
Mass and distance
d)
Distance and time
75.
Can be measured in meters per second (m/s)
a)
Distance
b)
Time
c)
Speed
d)
Acceleration
76.
What is happening at D?
a)
Stationary
b)
Accelerating
c)
Fast steady speed; moving away from the starting position
d)
Slower steady speed; moving away from the starting position
77.
What is happening at E?
a)
Stationary
b)
Accelerating
c)
Fast steady speed; moving away from the starting position
d)
Steady speed; returning to start position
78.
What is speed?
a)
how far you go
b)
how much distance is covered over a period of time
c)
how fast you accelerate
d)
the change in the location of a object
79.
a)
b)
c)
d)
80.
a)
b)
c)
d)
81.
Which runner won the race?
a)
A
b)
B
c)
C
82.

what is a force?

a)

a push or a pull

b)

change in displacement

c)

change in direction

83.

The forces that need two objects to be in contact with each other are called.......

a)

contact forces

b)

non-contact forces

c)

electric forces

d)

magnetic forces

84.

select the examples of contact forces.(tick mark the answers)

a)

normal reaction

b)

tension

c)

friction force

d)

gravitational force

e)

Applied Force

85.

select the non contact forces.(tick mark your answers)

a)

gravitational force

b)

electric force

c)

magnetic force

d)

friction force

86.

what kind of force is shown in this picture?

a)

gravitation force

b)

electric force

c)

magnetic force

d)

friction force

87.

what kind of force is represented in the picture by

 f→\overrightarrow{f}  

a)

gravitation force

b)

electric force

c)

magnetic force

d)

friction force

88.

what is the force acting in the ropes of the swing?

a)

tension

b)

normal reaction

c)

friction

d)

gravitation

89.

what force is applied on the book by the table.(represented by R)

a)

normal reaction

b)

friction force

c)

magnetic force

90.

what is the force used to attract the scarp iron?

a)

magnetic force

b)

tension

c)

electric force

d)

friction

91.

what is the force shown in the picture?

a)

magnetic force

b)

electric force

c)

applied force

92.
What force holds the planets in motion around the sun?
a)
Magnetic
b)
Electrical
c)
Gravitational
d)
Air Resistance
93.

Rina’s mother asked her to help move some items from the hall closet to the garage. One item she wanted to move was a large box of old school books. Rina tried to lift the box, but could not pick it up. What force was Rina NOT able to overcome?

a)

frictional force

b)

gravitational force

c)

applied force

d)

normal force

94.

Look at the illustration below of a block sitting on a table-top. The magnified view illustrates a force that exists between the two objects.

Which type of force is demonstrated in the magnified view?

a)

normal force

b)

applied force

c)

gravitational force

d)

frictional force

95.
Name the missing force....
a)
weight force
b)
normal force
c)
frictional force
d)
tension force
96.
What type of force?
a)
Magnetic
b)
Gravitational
c)
Applied
d)
Normal
97.
What type of force is holding this balloon to the wall?
a)
Applied
b)
Gravitational
c)
Magnetic
d)
Electrical
98.
What force holds the planets in motion around the sun?
a)
Magnetic
b)
Electrical
c)
Gravitational
d)
Air Resistance
99.
What force ultimately slows the roller coaster to a stop?
a)
Applied
b)
Normal
c)
Friction
d)
Magnetic
100.
Name the missing force...
a)
applied force
b)
weight force
c)
lift
d)
normal force
101.

An Orange falls off a tree and lands on the ground. What force caused the orange to fall?

a)

friction

b)

heat

c)

gravity

d)

wind

102.
Friction acts in a direction __________ to the direction of the object’s motion.   
a)
Side By Side
b)
Parallel Directions
c)
 Opposite
d)
The Same Direction
103.

The repelling or attracting force between a magnet and a ferromagnetic material (like iron).

a)

Magnetic Force

b)

Electrical Force

c)

Gravity

104.

A forces applied when the objects involved are in direct contact.

a)

Contact forces

b)

Normal forces

c)

Non-contact forces

105.

Generated between two bodies in contact with each other by rubbing between them.

a)

Push or pull

b)

Tension

c)

Elasticity

d)

Friction

106.

Is the force usually exerted by a surface on an object that is resisting against it.

a)

Friction

b)

Normal force

c)

Elasticity

d)

Tension

107.

Is the force of attraction that causes an apple to fall to the ground

a)

Tension force

b)

Applied force

c)

Gravitational force

d)

Normal force

108.

Which sentence below describes a contact force?

a)

A baseball bat hits a baseball

b)

A book falls to the floor

c)

A leaf floats in the air and falls to the ground.

d)

A magnetic force pulls a paper clip toward a magnet

109.

The force of pushing a chair across the floor of a room

a)

Normal force

b)

Applied Force

c)

Gravitational Force

d)

Spring Force

110.

What force is F1 (downward force)

a)

Friction force

b)

Gravitational Force

c)

Normal Force

d)

Applied force

111.

What force is F4 (leftward force)

a)

Friction force

b)

Gravitational Force

c)

Normal Force

d)

Applied force

112.
Magnets can be a useful tool. Look closely at the picture below which shows a magnet and various metal objects.
What will happen as the magnet moves closer to the metal objects? 
a)
The magnet will attract the objects.
b)
The magnet will become heavier.
c)
The magnet will push the objects away
d)
Nothing will happen to the objects
113.

A forces applied when the objects involved are in not in direct contact with each other.

a)

Contact forces

b)

Normal forces

c)

Non-contact forces

114.

The students in Mrs. Hoffman’s class played tug-of-war. The girls pulled in one direction with a force of

150 N. The boys pulled in the opposite direction with a force of 100 N. Who won the game and why did they win?

a)

The boys won because they applied a stronger force to the rope.

b)

The boys and the girls tied because they applied equal forces to the rope.

c)

The girls won because they applied a stronger force to the rope.

d)

Too much force was applied, the rope broke.

115.

The pace an object travels in a certain amount of time

a)

speed

b)

acceleration

c)

Velocity

d)

motion

116.

What two things do you need to find speed (select both)

a)

distance

b)

time

c)

velocity

d)

direction

117.

SI unit for speed

a)

Mph

b)

m/s or km/h

c)

newtons

d)

pounds

118.

Increase rate of speed over time

a)

Acceleration

b)

Velocity

c)

speed

d)

fast

119.
Which graph shows an object slowing down?
a)
A
b)
B
c)
C
d)
E
120.
Which graph shows an object increasing speed?
a)
A
b)
B
c)
D
d)
E
121.
The Standard Units for Speed is ?
a)
m/s (meters per second)
b)
ms (meters times seconds)
c)
mskg (meters times seconds kilograms)
d)
m/s*kg (meters per second kilograms)
122.
Wind pushes a toy sailboat across a pond. The boat moves in a straight path. What is changing?
a)
the boat’s direction
b)
the boat’s path
c)
the wind’s direction
d)
the boat’s position
123.

Motion is measured as _____

a)

rate.

b)

velocity

c)

feet

d)

mph

124.

A series of steps used by scientists to solve a problem or answer a question.

a)

scientific method

b)

recipe

c)

data collection

d)

metric system

125.

A testable explanation to a problem that has not yet been tested.

a)

data

b)

theory

c)

hypothesis

d)

fact

126.

This variable in an experiment is the one being changed by the scientist.

a)

dependent variable

b)

independent variable

c)

data

d)

control group

127.

Dependent variable means

a)

the scientist controls what to test

b)

educated guess

c)

ask a question

d)

what is being measured

128.

The dependent variable in an experiment is what you ________________.

a)

Change

b)

Measure

c)

Ignore

d)

Manipulate

129.
This graph shows
a)
An object stopped
b)
An object moving at constant speed
c)
An object slowing down
d)
An object speeding up
130.
Speed is equal to 
a)
Distance/Time
b)
Time/Distance
c)
Time x Distance
d)
Acceleration
131.

Which of the following is classified as nonliving?

a)

made of one or more cells

b)

responds to external stimuli

c)

reproduce only with a host cell

d)

obtain and use energy

132.

A sour taste is a characteristic of:

a)

acids

b)

bases

c)

neutral

d)

pH scale

133.

Which is a characteristic of a base?

a)

tastes sour

b)

found mostly in foods

c)

feels slippery

d)

turn litmus paper red

134.

pH is the measure of the concentration of ______.

a)

Acids

b)

H+ ion

c)

OH- ion

d)

Bases

135.

According to Arrhenius, what is the definition of an ACID?

a)

a substance that contains hydroxide and ionizes to produce OH-

b)

a substance that contains hydrogen and ionizes to produce H+

c)

a substance that contains hydrogen and ionizes to produce OH-

d)

a substance that contains hydroxide and ionizes to produce H+

136.

According to Bronsted-Lowry, what is the definition of an BASE?

a)

a substance that donates a hydrogen (H+) ion

b)

a substance that donates a hydroxide (OH-) ion

c)

a substance that accepts a hydrogen (H+) ion

d)

a substance that accepts a hydroxide (OH-) ion

137.

A substance that is 3 on the pH scale would be a(n):

a)

acid

b)

base

c)

neutral

d)

solute

138.
Which one of the following is an example of a base?
a)
orange juice
b)
dish soap
c)
vinegar
d)
lemons
139.
Bleach and oven cleaner are:
a)
strong acids
b)
weak acids
c)
strong bases
d)
weak bases
140.
Which of the following is NOT a characteristic of an acid?
a)
sour taste
b)
corrosive
c)
it feels slippery
d)
it can burn the skin
141.
A substance that is a 10 on the pH scale would be a(n) ____.
a)
acid
b)
neutral
c)
base
d)
indicator
142.

Taste bitter

a)

acids

b)

bases

c)

neutral

d)

pH paper

143.

Taste sour

a)

acids

b)

bases

c)

neutral

d)

pH scale

144.

According to the pH scale, which item is a stronger base than soap?

a)

baking soda

b)

ammonia solution

c)

tomato

d)

bleach

145.

Which is the correct set of acid properties?

a)

sour taste, corrosive, change litmus from red to blue

b)

sour taste, corrosive, change litmus from blue to red

c)

sweet taste, slippery, change litmus from blue to red

d)

sour taste, slippery, change litmus from blue to red

146.

Which of the following is an acid?

a)

soap

b)

baking soda

c)

orange juice

d)

pure water

147.

Ammonia has a pH of 11. Ammonia is __________.

a)

an acid

b)

a base

c)

an element

d)

a metal

148.

Tastes sour

a)

acid

b)

base

c)

neutral

d)

both acids & bases

149.

Tastes bitter.

a)

Acids

b)

Bases

c)

None of the following

d)

Acids & Bases

150.

A substance that is 3 on the pH scale would be a(n):

a)

acid

b)

base

c)

neutral

d)

solute

151.
Bases are located where on the pH scale?
a)
any number can be a base
b)
below 7
c)
above 7
d)
number 7 is a base
152.
Bleach and oven cleaner are:
a)
strong acids
b)
weak acids
c)
strong bases
d)
weak bases
153.
A substance that is a 10 on the pH scale would be a(n) ____.
a)
acid
b)
neutral
c)
base
d)
indicator
154.

Which of the following is the strongest acid?

a)

soap - 10

b)

HCL - 0

c)

blood - 7.45

d)

soft drink - 3

155.

Milk is a very weak acid. What might its pH value be?

a)

6.5

b)

7.8

c)

4.2

d)

12.2

156.

Stronger acids have a pH closer to...

a)

7

b)

0

c)

14

d)

9

157.

Weaker bases have a pH closer to...

a)

8

b)

0

c)

14

d)

4

158.

A pH level of 7 indicates

a)

acid

b)

base

c)

neutral

d)

none of the following

159.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
160.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base

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