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2018 Grade 8 Intermediate-Level Science Test Questions 31-45
Test Description: Use your knowledge of Science to answer all questions. Good Luck.
Instructions: Answer all questions to get your test result.
Helpful Hint
The graph below shows the change in ozone concentration with altitude in Earth’s atmosphere. The data table below shows the average height range above sea level, in kilometers (km), for the different layers of Earth’s atmosphere.
1) Which layer of Earth’s atmosphere contains the highest concentration of ozone?
A
upper troposphere
B
middle stratosphere
C
lower troposphere
D
lower stratosphere
Helpful Hint
The cross section below represents a plunge pool that formed at the bottom of a waterfall.
2) The plunge pool at the bottom of the waterfall was formed mainly by
A
erosion
B
deposition
C
precipitation
D
evaporation
3) What is the main source of energy for the water cycle?
A
winds
B
the Moon
C
the Sun
D
oceans
Helpful Hint
The diagram below represents a Lystrosaurus. Lystrosaurus was an herbivore that lived on land about 250 million years ago. Fossils of this dinosaur have been discovered on the widely separated continents of Africa and South America.
4) Which statement best explains why Lystrosaurus fossils are found on these two continents?
A
This dinosaur could fly to distant locations.
B
Both continents were once joined together.
C
Predators transported the remains of this dinosaur between continents.
D
Glaciers transported the fossils to the two continents.
5) A student correctly determined the density of two rocks. If the volumes of the two rocks are equal, the rock with the greater density has a
A
greater mass
B
smoother surface
C
rounder shape
D
smaller size
6) Which terms best describe the properties of a gas?
A
definite volume and no definite shape
B
no definite volume and no definite shape
C
definite volume and a definite shape
D
no definite volume and a definite shape
7) Low-pressure systems generally move across the United States from
A
west to east
B
south to north
C
north to south
D
east to west
Helpful Hint
The block diagram below represents a displaced rock structure.
8) Which process was responsible for the displacement of the horizontal rock layers?
A
tilting
B
folding
C
faulting
D
weathering
9) Which event is an example of a physical change?
A
iron rusting
B
eggs cooking
C
fireworks exploding
D
ice melting
Helpful Hint
The diagram below represents a portion of the Periodic Table of the Elements.
10) Based on its position in the Periodic Table, at room temperature, cadmium is most likely a
A
metal
B
noble gas
C
nonmetal
Helpful Hint
The model below represents a molecule of ammonia gas.
11) Ammonia gas would be classified as
A
an element
B
a mixture
C
an atom
D
a compound
Helpful Hint
When calcium carbonate (CaCO3) is heated, it decomposes to form calcium oxide (CaO) and carbon dioxide (CO2). The equation below shows this reaction.
12) In this reaction, the mass of CaCO3
A
is less than the mass of CaO plus the mass of CO2
B
equals the mass of CaO minus the mass of CO2
C
equals the mass of CaO plus the mass of CO2
D
is greater than the mass of CaO plus the mass of CO2
Helpful Hint
The chart below shows the wind-chill temperatures caused by wind speeds at different surface air temperatures.
13) What is the wind-chill temperature when the surface air temperature is 10°F and the wind speed is 20 mph?
A
4°F
B
-9°F
C
-41°F
D
9°F
Helpful Hint
The diagram below represents a person using a wheelbarrow to move a heavy load of soil.
14) Which two simple machines are parts of the wheelbarrow?
A
an inclined plane and a pulley
B
an inclined plane and a wheel and axle
C
a lever and a pulley
D
a lever and a wheel and axle
Helpful Hint
The diagram below represents the rock cycle.
15) According to this diagram, metamorphic rock is formed by
A
weathering and erosion
B
heat and/or pressure
C
burial and compaction
D
melting and solidification
*select an answer for all questions
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