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Worksheets8th Grade Challenge
Total questions: 51
Worksheet time: 28mins
Name
Class
Date
1.
A train travels 200 km between two cities. It left at 2 pm and arrived at 4 pm. What was the trains average speed?S= d/t
a)
10 km/h
b)
100 km/h
c)
400 km/h
d)
200 km/h
2.
The velocity of a car doubles over a certain amount of time. What additional information would you need to determine the acceleration of the car?A= Velocityfinal-Velocityinitial/ Time
a)
The distance
b)
The starting velocity
c)
The average speed
d)
The route traveled
3.
Two forces are acting on the rope. What is the net force of the rope. (look at the picture)
a)
0 N
b)
2 N to the right
c)
2N to the left
d)
22 N to the right
4.
Simple machines are useful to people because they increase...
a)
Distance
b)
Force
c)
Load
d)
Resistance
5.
A student applied 100 N to push a wheel borrow 5 meters. How much work has been done? W=f x d
a)
20 watts
b)
105 j
c)
20 j
d)
500 j
6.
What is the mechanical advantage of the lever in the picture?
a)
30,000
b)
400
c)
2
d)
3
7.
Forces are applied to a box as shown in the picture. Which statement correctly explains what will happen with the box?
a)
The box will not move because the forces are balances
b)
The box will move to the right because there is more force pushing right
c)
The box will move left because there is more force pushing left.
d)
Friction will cause the box to move up
8.
Candice conducted an experiment to see if her rose bush plants would grow taller when watered with soda. She planted three rows of rose bushes and poured one can of soda on each plant daily. Each row received a different type of soda - dark, clear, or orange colored. Every Friday, Candice carefully measured and recorded the height of each rose plant. How could Candice improve her experiment?
a)
plant a different type of rose bush in each row
b)
move the roses in row #2 into the house
c)
pour different amounts of solda on each row of roses
d)
add a row of rose bushes that receive only water
9.
An experiment is repeated one or more times in exactly the same way by a scientist.
What is this called?
What is this called?
a)
a dependent experiment
b)
an independent experiment
c)
a repeated trial
d)
a scientific copy
10.
One of dalton's conclusions concerning his atomic theory was that all atoms of the same element are---
a)
combined
b)
the same
c)
reacted
d)
different
11.
The positively charged particle in the center of an atom is called the---
a)
electron
b)
proton
c)
quark
d)
neutron
12.
An atom's mass number is 10 and its atomic number is 6. How many neutrons does the atom have?
a)
16
b)
20
c)
4
d)
10
13.
The diagram above shows a block from the periodic table. The number six represents the —
a)
atomic mass of the element carbon
b)
number of valence electrons in the element carbon
c)
atomic number of the element carbon
d)
number of neutrons in the element carbon
14.
Which group of the periodic table has a full, complete set of valence electrons in the outer energy level?
a)
group 14, Carbon group
b)
group 17, Halogens
c)
group 1, Alkali metals
d)
group 18, Noble Gases
15.
An atom's mass number is 10 and its atomic number is 6. How many neutrons does the atom have?
a)
16
b)
20
c)
4
d)
10
16.
Which property makes metals good conductors of electricity?
a)
The electrons in a metal can move freely.
b)
The negative charge of the electrons cancels the positive charge of the metal ions.
c)
The positively charged metal ions attract free electrons around them
d)
The electrons are shared equally by all of the atoms that make up the metal.
17.
If sodium (Na) bonds with chlorine (Cl), which statement is true?
a)
An electron is transferred from sodium to chlorine and a covalent bond is formed.
b)
An electron is transferred from chlorine to sodium and an ionic bond is formed.
c)
An electron is shared between sodium and chlorine and a covalent bond is formed.
d)
An electron is transferred from sodium to chlorine and an ionic bond is formed.
18.
The outermost electrons in an atom are called —
a)
cloud electrons
b)
valence electrons
c)
orbital electrons
d)
far electrons
19.
These two beakers contain the same liquid substance at the same temperature. How does the thermal energy of the liquid in the larger beaker compare to the thermal energy of the liquid in the smaller beaker?
a)
The liquid in the
larger beaker has
less thermal energy
than the liquid in
the small beaker.
larger beaker has
less thermal energy
than the liquid in
the small beaker.
b)
The exact volume of
liquid in each beaker
must be know to
compare the thermal
energy of the liquids
liquid in each beaker
must be know to
compare the thermal
energy of the liquids
c)
The liquid in the
larger beaker has
the same amount of
thermal energy
larger beaker has
the same amount of
thermal energy
d)
The liquid in the
larger beaker has
more thermal energy
larger beaker has
more thermal energy
20.
Which form of energy is due to the motion of an object's particles? (Not the motion of the object)
a)
Thermal energy
b)
mechanical energy
c)
electromagnetic energy
d)
chemical energy
21.
A cold block of metal is placed in contact with a warm block of metal. Which type of energy will be transferred
between the blocks?
between the blocks?
a)
thermal energy
b)
mechanical energy
c)
electrical energy
d)
chemical energy
22.
Which form of energy is due to the motion of an object's particles?
a)
Thermal energy
b)
mechanical energy
c)
electromagnetic energy
d)
chemical energy
23.
When a ball is thrown in the air, it follows a curved path.At which point does the ball have the greatest amount of gravitational potential energy?
a)
Point X
b)
Point W
c)
Point Y
d)
Point Z
24.
What process is occurring in the pot of boiling water?
a)
Convection
b)
Induction
c)
Conduction
d)
Radiation
25.
The energy that is produced by the vibrations of electrically charged particles, includes light and radio waves.
a)
Radiant energy
b)
Chemical energy
c)
Nuclear Energy
d)
Mechanical Energy
26.
The energy stored in the chemical bounds of molecules.
a)
chemical energy
b)
nuclear energy
c)
radiant energy
d)
mechanical energy
27.
Solar energy is a form of what kind of energy?
a)
Chemical energy
b)
Electromagnetic energy
c)
Thermal energy
d)
Mechanical energy
28.
As liquid water loses energy in the form of heat, the water begins to freeze. What causes freezing?
a)
Heat removes thermal energy from the liquid water and causes it to become an ice cube.
b)
The loss of thermal energy from the water causes it molecules to move slower.
c)
The freezer absorbs the heat energy of the water
d)
The loss of heat causes the molecules in the ice cube to contract and forces them together
29.
While on vacation, Carine rides in a hot-air balloon. To make the balloon rise, the pilot turns on a flame to warm the air inside the balloon. How does the air change?
a)
The motion of the particles increases.
b)
The air particles move closer together.
c)
The air changes to a different state of matter.
d)
The temperature of the air decreases.
30.
What would be an independent variable in an experiment where the testable question is, "Which paper towel brand is the strongest?"
a)
brand of paper towel
b)
amount of weight placed on each towel
c)
number of times each brand is tested
d)
strength of the paper towel
31.
What would be a dependent variable in an experiment where the testable question is, "What level of salt works best to hatch brine shrimp?"
a)
The number of brine shrimp eggs placed in each salt solution
b)
The amount of salt used in each solution
c)
The number of brine shrimp that hatch in each solution
d)
The temperature of each salt solution
32.
Which variable values should you know before you start an experiment?
a)
Dependent Variable
b)
Independent Variable
33.
The size of the plant would be the dependent variable for an experiment for which of the following testable questions?
a)
What light brightness makes plants grow the largest?
b)
Does plant size affect the amount of carbon dioxide that is absorbed?
c)
Which fertilizer makes plants grow the fastest?
d)
Which types of plants will die in mercury-polluted soil?
34.
How does watching TV during studying affect a student’s test grades?
a)
independent
b)
dependent
35.
Does the temperature of water affect the time it takes a sugar cube to dissolve?
a)
IV: Type of water
DV: Dissolving rate
DV: Dissolving rate
b)
IV: Temperature of water
DV: type of sugar cube
DV: type of sugar cube
c)
IV: Temperature of Water
DV: Dissolving Rate
DV: Dissolving Rate
d)
IV: Time
DV: Number of sugar
DV: Number of sugar
36.
Fossil Fuels are fuels
a)
formed from the decaying remains of plants only
b)
formed from the decaying remains of plants and animals that were compressed over a short period of time
c)
formed from the decaying remains of plants and animals that lived millions of years ago
d)
formed from decaying food
37.
An example of a biofuel is
a)
gasoline
b)
oil
c)
animal waste
d)
minerals
38.
Geothermal energy is
a)
heat energy naturally produced in earthquakes
b)
is heat naturally produced in space
c)
is heat naturally produced within Earth
d)
is heat energy naturally produced in the water
39.
Hydroelectric power produces electricity using.....
a)
Wind
b)
Sunlight
c)
Moving water
d)
Dung
40.
There are 3 Main Fossil Fuels. We Know Them As --
a)
Carbon Dioxide, Oxygen, Nitrogen
b)
Cookies, Nutella, Granola
c)
Coal, Oil, Natural Gas
d)
Canyons, Oceans, Nymph
41.
Nuclear Power is a __________ energy resource.
a)
Renewable
b)
Nonrenewable
42.
What is the largest concern we have with adding too much CO2 to the atmosphere?
a)
makes too many clouds
b)
contributes to a warmer planet
c)
affects our breathing
d)
disrupts solar energy
43.
__________ is an energy resource that WILL NOT run out in the next several hundred years.
a)
Renewable Energy Resource
b)
Nonrenewable Energy Resource
c)
Fossil Fuel
d)
Forever Fuel
44.
Does hydroelectric energy dams cause
a)
aquatic habitat destruction
b)
pollution
c)
flooding
d)
hurricanes
45.
In which areas would you find the most wind turbines?
a)
on high steady winded area usually on coasts
b)
new york city
c)
chicago, the windy city
46.
What are 3 reasons solar energy hasn't replaced fossil fuels?
a)
cost
b)
efficiency
c)
greenhouse gas
d)
storage
47.
What form of renewable energy requires a dam?
a)
solar
b)
nuclear
c)
biomass
d)
hydroelectric
48.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
49.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
50.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
51.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
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