Planets — Unit test Answers

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Which statement correctly describes terrestrial planets?

A
They are made of mostly rock.
B
They are made of gases.
C
They are small objects of ice and dust.
D
They are very large compared to other planets.
2
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Which planet in the solar system is least dense?

A
Jupiter
B
Mercury
C
Neptune
D
Saturn
3

Which is a factor that keeps Earth in orbit around the Sun?

A
the orbital path of the moon
B
the gravitational pull of the Sun
C
the continuous motion of the universe
D
Earth’s changing speed and direction
4

Observable matter makes up about what percentage of the universe?

A
5%
B
10%
C
50%
D
95%
5

Which planet is small, with a rocky surface and an atmosphere?

A
Jupiter
B
Neptune
C
Uranus
D
Venus
6

Which remains the same as the distance of an object from Earth changes?

A
size of the force
B
strength of gravity
C
mass of the object
D
weight of the object
7

Which causes objects in the universe to resist a change in speed or direction?

A
gravity
B
inertia
C
motion
D
orbit
8

What force acts between Earth and the moon?

A
gravity
B
mass
C
motion
D
newtons
9

If astronomers discovered a new inner planet in the solar system, which characteristic would it most likely have?

A
large size
B
gaseous composition
C
many moons
D
fast revolution

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