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8th Grade Physical Science Review Flashcards | StudBud
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8th Grade Physical Science Review
8th Grade Physical Science Review
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review for upcoming standardized test
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1
Which material is translucent?
clear plastic
pure air
construction paper
frosted glass
2
In which state of matter are the particles able to move around one another?
solids, liquids and gases.
gases and liquids only
liquids only
gases only
3
Which represents the greatest acceleration?
200cm/s2
0.020km/s2
200 m/s
0.002km/s2
4
Which state of matter takes up both the volume and shape of the container that holds it?
gas
solid
liquid
ice
5
A lamp has an electrical input of 120 watts. If 80 becomes light, how much is turned to heat?
less than 40 watts
exactly 40 watts
more than 40 watts
exactly 80 watts
6
Which form of electromagnetic energy has the shortest wavelength?
infrared waves
gamma rays
radio waves
ultraviolet waves
7
How is temperature related to heat?
Temperature is a measure of heat
Heat causes a change in the temperature of an object
Temperature and heat are the same thing
Raising the temperature causes the heat to increase
8
Which of these statements describes a physical change?
Onions taste sweeter after they are cooked.
A banana starts to smell as it ripens.
Copper turning green when exposed to air.
Aluminum cans getting crushed before recycling.
9
What is heat?
Average kinetic energy of the particles in a substance
Energy transferred between two objects
Total thermal energy of a substance
Change in the temperature in degrees Celsius
10
The picture below shows measurements made as a wave passed. What is the frequency of the wave?
2 seconds
0.5 Hz
5 seconds
2 Hz
11
What are you measuring when you take the temperature of something?
potential energy
kinetic energy
average kinetic energy
average potential energy
12
Which of these substances is a compound?
uranium
nitrogen
ammonia
chlorine
13
What property of a metal coin would be different on Mars than on the Earth?
volume
mass
density
weight
14
Which of these statements correctly describes the law of conservation of energy?
Energy cannot be created nor destroyed, but can change forms
Objects can only have potential or kinetic energy, not both
The energy destroyed when objects stop is equal to the mass
The amount of Kinetic Energy is a constant value
15
A car drives straight for 45 miles during 1 hour. What else do you need to figure velocity?
The direction the car traveled
the total distance the car traveled
how many times the car stopped
how long the car stopped for
16
Through which of these media do sound waves travel most slowly?
cold air
iron
wood
water
17
The image below shows a wave. What type of wave is it?
electromagnetic
transverse
longitudinal
medium
18
What is the evidence that an unbalanced force is acting on an object?
The mass of the object changes.
The object remains at rest.
The object has constant velocity.
The motion of the object is changing.
19
What must two objects have for gravity to exist between them?
mass
volume
roundness
solidness
20
What is a unit of force in the metric system?
joule
newton
pound
kilogram
21
Calcium is an element. What is the smallest particle you can have of calcium?
a molecule that contains calcium
an electron from calclum
an atom of calcium
a proton from calcium
22
How does fiberglass insulation keep your home warm in the winter?
The fiberglass is an insulator
The fiberglass absorbs energy
The air trapped in the fiberglass is an insulator
The fiberglass generates heat
23
Which type of electromagnetic wave has the highest energy?
radio waves
microwaves
visible light waves
infrared waves
24
The data below is for a moving car. What is the average speed of the car?
20 m/s
40 m/s
60 m/s
120 m/s
25
As you watch ice cream melting on a hot day, what are you observing?
the formation of a new substance
a physical change
a chemical reaction
a chemical change
26
Which unit is used to measure distance?
centimeters
grams
seconds
milliliters
27
Why does a red shirt appear red to your eyes?
it absorbs all colors in white light
it reflects every color except red
it reflects all colors in white light
it absorbs every color except red
28
In the picture below, what part of a wave is represented by B?
wavelength
trough
amplitude
crest
29
Which of these particles is the smallest?
an electron
an atom
a proton
a nucleus
30
What type of energy is stored in batteries?
chemical
kinetic
elastic
thermal
31
Erin warms hot chocolate in the microwave. What happens as the temperature increases?
The particles move farther apart
The particles have less energy
The particles move slower
The particles are arranged in a pattern
32
The sidewalk is heated on a hot day. How do the sidewalk particles change?
They move faster
Their kinetic energy decreases
They move freely from place to place
They move closer together
33
What process is an example of a physical change?
baking soda and vinegar bubbling
a sandwich being broken down by your stomach
sodium metal reacting with water
carrots being cut up for a salad
34
What is a wave?
a disturbance that transfers energy
any type of energy that makes particles move
any type of matter that vibrates back and forth
a disturbance that transfers matter
35
Which property of matter does not change regardless of how big a sample you have?
flammability
volume
density
reactivity with oxygen
36
Which of these is a chemical property of a sheet of paper?
the paper does not conduct electricity
the paper does not attract magnets
the paper can be crumpled
the paper can be burned
37
Why do you weigh less on the moon than on Earth?
the moon has a smaller radius
the moon has less mass than Earth
the moon is closer to the sun
the moon is more dense than Earth
38
A solid rock is sitting on the ground. What best describes the particles inside the rock?
constantly sliding over each other
always moving from place to place
not moving at all
vibrating, but not changing place
39
What do microwaves transfer between a cell phone and a cell phone tower?
energy
electricity
air particles
sound
40
A car battery stores 12V of energy. If 9V is converted to electricity, what is the efficiency?
0.75%
0.25%
25%
75%
41
What is true of an object that is in free fall?
no forces act on the object
the forces of thrust and gravity are balanced
the forces of air resistance and gravity are balanced
only gravity acts on the object
42
As an ice cube melts into a liquid, what property of the water remains unchanged?
temperature
density
volume
mass
43
When paper is burned, the mass of the ash is less than the original paper. Why?
Some of the products were given off as a gas.
Some of the matter is destroyed during burning.
The mass of the ash cannot be accurately measured.
the ash has less volume than the paper.
