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ADV 8th Benchmark Review 1-e
Test Description: 8th grade Physical Science Review for Fall Benchmark
Instructions: Answer all questions to get your test result.
1) What is the density of a substance based on?
A
height and weight
B
mass and volume
C
speed and velocity
D
length and volume
2) You place a block of wood into a beaker of water and it floats. What can you say about the buoyant force on the block?
A
It is less than the block's weight
B
It is equal to the block's weight
C
It is equal to the weight of the surrounding water
D
It is greater than the blocks weight
3) If an object weighing 10 N rests on a surface with an area of 2 m^2, the pressure that the object exerts is
A
0.20 Pa.
B
2 Pa.
C
20 Pa.
D
5 Pa.
4) When a sample of liquid is divided in half, its density
A
is half as much
B
is four times greater
C
stays the same
D
is two times greater
5) Why does an airplane rise in the air?
A
It experiences a buoyant force because it is less dense than the air.
B
The airplane's cabin is presurized
C
The pressure above the wings is greater than the air pressure below the wings
D
The moving air above and below the wings creates an unbalanced force that pushes the airplane up
6) You observe that a chunk of tar sinks in puddles of rainwater but floats on the ocean. An experiment to explain the behavior of the tar should measure
A
the densities of freshwater, salt water and tar.
B
the difference between atmospheric pressure and water pressure.
C
the depth of each type of water
D
the height from which the chunk of tar is dropped.
7) Objects sink in water when they have greater
A
volume than water.
B
mass than water.
C
density than water.
D
weight than water.
8) The buoyant force pushes objects
A
upwards.
B
downwards.
C
sideways.
D
in all directions.
9) What is the density of a 2 in sugar cube that weighs 16 gr
A
2 g/ml
B
20 g/ml
C
1/8 g/ml
D
36 g/ml
10) Oil floats on water because
A
The oil is lighter than the water
B
Both substances have equal densities
C
The oil is less dense than the water
D
The water is less dense than the oil
*select an answer for all questions
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