Quiz about 8th grade Science Final Exam Review (2nd Semester)

Question 1

An organized process used to gather observations and test a hypothesis is a(n) ______.

Accepted Answer

Experiment

Answer

Problem

Answer

Exercise

Answer

Constant

Question 2

A testable prediction based on observations is a(n)

Accepted Answer

hypothesis

Answer

experiment

Answer

exercise

Answer

exercise

Question 3

In a graph, the variable on the horizontal (x) axis is the____

Accepted Answer

independent variable

Answer

variable with the largest range

Answer

variable with the smallest range

Answer

dependent variable

Question 4

When an object's acceleration is _________________________, it slows down.

Accepted Answer

negative

Answer

positive

Answer

constant

Answer

zero

Question 5

Velocity is a combination of speed and __________?

Accepted Answer

direction

Answer

distance

Answer

displacement

Answer

acceleration

Question 6

What is the unit of measure for force?

Accepted Answer

newton

Answer

gram

Answer

newtonkilogram

Answer

amp

Question 7

What is the unit of measure for work?

Accepted Answer

joules

Answer

W

Answer

watts

Answer

ohms

Question 8

The tendency of an object to resist any change in its state of motion is called___________________.

Accepted Answer

inertia

Answer

energy

Answer

resistance

Answer

acceleration

Question 9

What does this graph represent?

Accepted Answer

Constant Speed

Accepted Answer

Acceleration

Answer

Deacceleration

Answer

Not moving

Question 10

Acceleration can make an object __________________________.

Accepted Answer

all of these

Answer

speed up

Answer

slow down

Answer

change direction

Question 11

On this graph, during what time period does the object have positive velocity?

Accepted Answer

1 - 3 s

Answer

0 - 1 s

Answer

3 - 5 s

Answer

4.5 - 6 s

Question 12

On this graph, during what time period is the object not moving?

Accepted Answer

0 - 1 s

Answer

0-6 s

Answer

4.5 - 6 s

Answer

1 - 3 s

Question 13

For every action there is an equal and opposite reaction.

Accepted Answer

Newton's 3rd law

Answer

Newton's 1st law

Answer

Newton's 2 nd law

Answer

Newton's 4 th law

Question 14

"An object at rest will remain at rest unless acted on by an outside force" is?

Accepted Answer

Newton's 1st law

Answer

Newton's 2nd law

Answer

Newton's 3rd law

Answer

Newton's 4th law

Question 15

Force and motion must be ___________ for work to be done.

Accepted Answer

in the same direction

Answer

at right angles to each other

Answer

zero

Answer

balanced

Question 16

Acceleration can change an object's ___________________.

Accepted Answer

both speed and direction

Answer

speed

Answer

direction

Answer

mass

Question 17

______________ is the tendency for a material to oppose the flow of electrons.

Accepted Answer

resistance

Answer

induction

Answer

transistance

Answer

conduction

Question 18

If all the bedroom lights in your house are on one circuit, what type of circuit would work best?

Accepted Answer

parallel

Answer

series

Answer

uniform

Answer

open

Question 19

If an object is acted on by an unbalanced force it will always move.

Accepted Answer

True

Answer

False

Question 20

The closer 2 objects are, the greater the gravitational force is between them.

Accepted Answer

true

Answer

false

Question 21

A(n) __________ is a push or pull.

Accepted Answer

force

Answer

newton

Answer

acceleration

Answer

momentum

Question 22

What is the formula to calculate speed?

Accepted Answer

S = d/t

Answer

S = t/d

Answer

S = d x t

Answer

S = t x d

Question 23

Force is equal to mass times acceleration.

Accepted Answer

Newton's 2nd law

Answer

Newton's 1st law

Answer

Newton's 3 rd law

Answer

Newton's 4 th law

Question 24

You drop a crumpled piece of paper and a flat piece of paper. The crumpled piece of paper hits the ground first, why?

Accepted Answer

The crumpled paper has less air resistance

Answer

Crumpling the paper adds mass which makes it accelerate

Answer

The flat paper has less weight, so gravity doesn't pull it as fast

Answer

The flat paper has less air resistance

Question 25

A 80 kg person was running at 2 m/s². How much force does the person have?

F=ma

Accepted Answer

160 N

Answer

40 N

Answer

91 N

Answer

82 N

Question 26

An object accelerating at 4 m/s/s experiences a force of 40 N. What is the object's mass? Use F = ma

Accepted Answer

10 kg

Answer

160 kg

Answer

0 kg

Answer

44 kg

Question 27

Ms. Christerson went on vacation. Her plane traveled 490,000 meters in 70 seconds. What was the plane's speed?

Grab a calculator if you need it!

Accepted Answer

7,000 m/s

Answer

7,000 miles per day

Answer

34,300,000 m/s

Answer

10 miles per hour

Question 28

A 3 kg object accelerates at 8 m/s. What is the net (total) force on the object? Use F = ma

Accepted Answer

24 N

Answer

2.33 N

Answer

5 N

Answer

11 N

Question 29

A car drives in a straight line at a constant speed. Is it accelerating?

Accepted Answer

No

Answer

Yes

Answer

There is not enough information to tell

Answer

There is no such thing as acceleration

Question 30

What are the units of acceleration?

Accepted Answer

meters per second per second (m/s/s)

Answer

meters (m)

Answer

seconds (s)

Answer

meters per second (m/s)

Question 31

What is the net force acting on this box?

Accepted Answer

90 N

Answer

30 N

Answer

6030 N

Answer

60 N

Question 32

What is the net force acting on this box?

Accepted Answer

2 N

Answer

18 N

Answer

80 N

Answer

108 N

Question 33

Is the picture showing a balanced or unbalanced force?

Accepted Answer

unbalanced

Answer

balanced

Answer

neither

Question 34

Two objects, a heavy one and a lighter one, are dropped from the same height at the same time. Which one will hit the ground first? Assume there is no air resistance.

Accepted Answer

They will hit the ground at the same time

Answer

The heavier one

Answer

The lighter one

Answer

It's impossible to tell

Question 35

The law of conservation of mass states that matter cannot be _____________ or _________________.

Accepted Answer

created or destroy

Answer

stained or made

Answer

washer or dried

Question 36

No current flows through this type of circuit.

Accepted Answer

open

Answer

series

Answer

parallel

Answer

closed

Question 37

A circuit made of wires, a lamp, a switch, and a cell is shown at the right. What change is needed for the lamp to glow?

Accepted Answer

The switch needs to be closed.

Answer

The switch needs to be opened.

Answer

The cell needs an insulator.

Answer

The wire needs to be connected to the bottom of the cell.

Question 38

What type of circuit is this?

Accepted Answer

Parallel Circuit

Answer

Series Circuit

Answer

Open Circuit

Answer

Transverse Circuit

Question 39

This is an example of a _______ circuit

Accepted Answer

series

Answer

open

Answer

parallel

Answer

square

Question 40

Magnets have a north and a south ___________

Accepted Answer

pole

Answer

shape

Answer

color

Answer

region

Question 41

a vertical column of elements in the periodic table.

Accepted Answer

Group

Answer

Period

Answer

Row

Answer

Block

Question 42

a horizontal row of elements in the periodic table.

Accepted Answer

Period

Answer

Group

Answer

Periodic Law

Answer

Column

Question 43

__Na + __Cl₂ --> __NaCl

Accepted Answer

2,1,2

Answer

1,1,2

Answer

2,1,1

Answer

already balanced

Question 44

__H₂O₂ --> __H₂O + __O₂

Accepted Answer

2,2,1

Answer

already balanced

Answer

2,1,1

Answer

2,1,2

Question 45

The large number in front of a chemical formula or compound is the ___________.

Accepted Answer

coefficient

Answer

product

Answer

physical

Answer

chemical

Question 46

The number 80 in Bromine-80 represents

Accepted Answer

The mass number

Answer

The atomic number

Answer

The sum of protons and electrons

Answer

None of these

Question 47

The blue numbers in the image below represent ________

Accepted Answer

subscripts

Answer

Charges

Answer

coefficients

Answer

none of the answers are correct

Question 48

A(n) ______ is a substance with a pH less than 7

Accepted Answer

Acid

Answer

Alkaline

Answer

Base

Answer

Buffer

Question 49

A(n) _______ is a substance with a pH greater than 7.

Accepted Answer

Base

Answer

Acid

Answer

Buffer

Answer

Water

Question 50

When atoms lose electrons, ___________ are formed, and when atoms gain electrons, __________ are formed.

Accepted Answer

cations, anions

Answer

anions, cations

Answer

cations, molecules

Answer

acids, anions

Question 51

Atoms of elements that are in the same group have the same number of

Accepted Answer

valence electrons.

Answer

protons.

Answer

neutrons.

Answer

protons and neutrons.

Question 52

Carbon and other nonmetals are found in which area of the periodic table?

Accepted Answer

on the right side

Answer

on the left-most side

Answer

in the middle column of the periodic table

Answer

in the bottom rows

Question 53

Most elements on the left side of the periodic table are

Accepted Answer

metals.

Answer

semiconductors.

Answer

nonmetals.

Answer

metalloids.

Question 54

Match the Model to the description

Accepted Answer

Bohr's atomic model

Answer

Our current model of the atom

Answer

Thomson's Plum Pudding atomic model

Answer

Rutherford's atomic model

Question 55

How many protons in an atom of carbon?

Accepted Answer

6

Answer

4

Answer

8

Answer

12.0

Question 56

An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?

Accepted Answer

30

Answer

56

Answer

26

Answer

82

Question 57

How many valence electrons in an atom of magnesium?

Accepted Answer

2

Answer

8

Answer

24.3

Answer

12

Question 58

Which of these elements on the periodic table is a metal?

Accepted Answer

Potassium

Answer

Helium

Answer

Carbon

Answer

Hydrogen

Question 59

Which subatomic particle has a negative charge?

Accepted Answer

electron

Answer

proton

Answer

neutron

Answer

quark

Question 60

Neutral solutions have a pH of:

Accepted Answer

7

Answer

0

Answer

1

Answer

14

Question 61

A sour taste is a characteristic of:

Accepted Answer

acids

Answer

bases

Answer

neutral

Answer

pH scale

Question 62

Which is a characteristic of a base?

Accepted Answer

feels slippery

Answer

tastes sour

Answer

found mostly in foods

Answer

turn litmus paper red

Question 63

What is the chemical symbol for iron?

Accepted Answer

Fe

Answer

I

Answer

Ir

Answer

R

Question 64

What is iron's atomic number?

Accepted Answer

26

Answer

12

Answer

55.85

Answer

55

8th grade Science Final Exam Review (2nd Semester)

100 questions

In an experiment, we leave one thing “normal” to compare the experimental results to. What is this called?

An organized process used to gather observations and test a hypothesis is a(n) ______.

A testable prediction based on observations is a(n)

In a graph, the variable on the horizontal (x) axis is the____

When an object's acceleration is _________________________, it slows down.

Velocity is a combination of speed and __________?

What is the unit of measure for force?

What is the unit of measure for work?

The tendency of an object to resist any change in its state of motion is called___________________.

What does this graph represent?

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