Worksheets8th Grade Science Assessment Review #3
Total questions: 15
Worksheet time: 8mins
A baseball player swings his bat and hits the ball along the ground. It rolls for some time and comes to a stop on the level playing field. What most likely causes the ball to stop moving?
a frictional force
a gravitational force
the mass of the ball
the size of the bat
How is thermal energy transferred during heat conduction within a metal wire?
motion of electrons through the wire
transfer of electrons from atom to atom
transfer of kinetic energy between colliding particles
transfer of potential energy between colliding particles
During class, the teacher showed an enlarged image of a small piece of sidewalk. The students saw that the sidewalk was rougher than they had previously thought. Which effect would the rough surface have on a box that is pulled along the sidewalk?
it would decrease the resistance between the forces that are pulling the box
it would help reduce the force of gravity when the box is pulled
it would oppose the force that is being applied to the box when it is pulled
it would reduce the amount of work that is performed when pulling the box
The graph shows the distance for a runner at different intervals during a race. During which part of the race did the runner move the fastest?
0-10 minutes
10-30 minutes
40-60 minutes
70-80 minutes
Two point charges create the electric field as shown. Apply the rules for the geometry of electric fields to determine the charges of X and Y.
X is a positive charge and Y is a negative charge
X is a negative charge and Y is a positive charge
X and Y are both positive charges
X and Y are both negative charges
John heated two beakers, each containing 100 mL of water. The water began to boil and John loosely wrapped one of the beakers in five layers of aluminum foil. He left the second beaker unwrapped. He measured the temperatures of the water in the beakers over time and recorded his data in the table. Which statement best explains John's observations?
Aluminum foil is a good conductor of thermal energy.
Layers of air between the foil wrappings reduced the transfer of heat.
The layers of aluminum foil absorbed heat instead of transferring it.
The warmer atmosphere around the foil-wrapped beaker prevented the transfer of thermal energy.
Water molecules are polar, as shown in the diagram. If you rub a balloon against your hair, your hair obtains a net positive charge. If you then place the balloon near a thin stream of water, how will the stream of water be affected?
A
B
C
D
Which results in a chemical change?
A student colors a paper blue.
A teacher feels a rough cloth.
A student smells a flower.
A teacher lights a candle.
Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate, as shown in the illustration. Which statement most accurately describes the mas of the reactants compared to the mass of the products?
The mass of the reactants is the same as the mass of the products.
The products have a greater mass because matter was created during the reaction.
The reactants have a greater mass because some of the mass was converted to heat.
The reactants have a greater mass because some matter was destroyed by the reaction.
Which observation indicates that a chemical reaction has taken place?
A material changes from a solid to liquid.
A new chemical substance is formed.
A Substance becomes warmer.
Bubbles form when a liquid is heated.
Well water can be acidic in some areas of North Carolina due to geology and land use. Acidic water can have a bitter or metallic taste. The table shows pH ranges during July for four different wells used for drinking water. Which of these wells most likely had water a metallic taste?
Well 1
Well 2
Well 3
Well 4
A sound wave traveling from a tuning fork through a medium is shown. How can the wavelength be determined?
by comparing the width of the bands at X and Y
by comparing the number of particles at X and Y
by measuring the distance between two points labeled X
by measuring the distance between a point labeled X and a point labeled Y
Based on the electromagnetic spectrum shown, what is the difference between microwaves and ultraviolet light?
microwaves have larger amplitude than UV light
microwaves have smaller amplitude than UV light
microwaves have a longer wavelength than UV light
microwaves have a shorter wavelength than UV light
A laser beam is aimed at four different objects. Through which of these objects will the laser beam pass and be refracted?
a black cloth
a glass prism
a piece of aluminum
a sheet of paper
When the velocity of an ocean wave decreases as it approaches shore, what happens to the wave?
it crests
its height decreases
its height increases
its length shortens
