Unit Test — Cumulative exam Answers

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Which force keeps the planets from floating off into space?

A
Earth’s gravity
B
the Sun’s gravity
C
the moon’s gravity
D
Milky Way’s gravity
3

During which event is more energy produced compared to other days to turn a turbine?

A
El Niño
B
a tsunami
C
during a spring tide
D
during a low tide
4

A college student has been assigned to write captions for a new textbook on gravity and motion. This is one of the pictures from the textbook.

Question illustration
A
The moon moves toward the Sun due to gravity.
B
The moon will move away from Earth because of inertia.
C
The moon would move in a circular path if there were no forces.
D
The moon would not stay in orbit without the pull of Earth's gravity.
7

Which factor increases as a result of increasing altitude?

A
air pressure
B
air density
C
size of gas molecules
D
space between gas molecules
8

Which list correctly names the three types of galaxies?

A
binary, open, globular
B
elliptical, open, binary
C
irregular, spiral, elliptical
D
open, irregular, spiral
9

Study this image of space.

Question illustration
A
a nebula
B
a red giant
C
a supernova
D
a neutron star
10

Which describes one event that causes an eclipse?

A
Earth’s rotation on its axis
B
shadows from clouds covering Earth
C
Earth’s shadow covering the moon
D
the gravity from the moon and Sun pulling in the same direction
13

Which two layers are part of the thermosphere?

A
exosphere and ionosphere
B
ionosphere and mesosphere
C
mesosphere and stratosphere
D
stratosphere and troposphere
16

Which describes a condition of the neritic zone?

A
few organisms
B
ample sunlight
C
changing salinity
D
frigid temperatures
17

Which is one way that spring tides are different from regular tides?

A
They occur twice a day.
B
They are caused by wind.
C
They happen along coastal areas.
D
They are extra-high tides and extra-low tides.
18

Look at the image of the moon.

Question illustration
A
full moon
B
third quarter
C
waxing gibbous
D
waning crescent
20

Which statement describes Earth?

A
It is an outer planet.
B
It is a gaseous planet.
C
It was formed from gas and dust.
D
It has a thick atmosphere of hydrogen and helium.

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