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7th Grade Science Common Exam Review
Test Description: Part 1
Instructions: Answer all questions to get your test result.
1) Why is the mesosphere colder than the troposphere?
A
Because the molecules in the troposphere are spaced farther apart
B
Because the mesosphere contains ozone
C
Because molecules in the mesosphere are spaced farther apart
D
Because the mesosphere is closer to the ground
2) Why would the Environmental Protection Agency seek to monitor atmospheric pollution and air quality?
A
to reduce the amount of oxygen needed by rain forests
B
to make sure the air pressure remains constant over time
C
to make it rain in drought affected areas
D
to maintain the respiratory health of humans
3) The theory of global warming is based on the increase of what atmospheric gas?
A
oxygen
B
helium
C
hydrogen
D
carbon dioxide
4) The burning of fossil fuels has been attributed to the accumulation of greenhouse gases and rising global temperatures. Which best explains this?
A
electrical energy is wasted during he burning of fossil fuels
B
solar energy is collected during the burning of fossil fuels
C
wind energy is produced during the burning of fossil fuels
D
thermal energy is released during the burning of fossil fuels
5) Which part of the atmosphere transmits radio waves, making it possible for us to listen to live radio music?
A
troposphere
B
stratosphere
C
mesosphere
D
ionosphere
6) Which is used in the classification of the layers of the atmosphere?
A
pollutants
B
air pressure
C
altitude
D
temperature
7) Certain substances are classified as water pollutants, others as air pollutants, and still others as land pollutants. Which of the following pollutes all three parts of our environment?
A
smog
B
ozone
C
acid rain
D
fluorocarbons
8) Why does most of the rain that falls come from the ocean?
A
the majority of evaporation takes place over the ocean
B
the majority of precipitation takes place over the ocean
C
Most clouds form near or over the ocean
D
Most rivers deposit freshwater into the ocean
9) The jet-stream lies between which two layers of the Earth’s atmosphere?
A
stratosphere and mesosphere
B
thermosphere and ionosphere
C
troposphere and stratosphere
D
mesosphere and thermosphere
10) Which best explains the Earth’s greenhouse effect?
A
clouds prevent sunlight from reaching the Earth
B
the ozone layer reflects ultraviolet radiation
C
air prevents heat from leaving Earthby trapping the outgoing long wave radiation
D
green plants use sunlight to produce food
*select an answer for all questions
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