Focus On Physical Science: California Grade 8

Chapter 11: Our Solar System

Standards Review

1.
What is Earth's period of rotation? 4.e
A)30 days
B)365 days
C)24 h
D)12 h
2.
What does the strength of the gravitational force between two objects depend on? 4.e
A)The sizes of the objects and the distance between them.
B)The masses of the objects and the distance between them.
C)The densities of the objects.
D)The volumes of the objects.
3.
What is Kepler's First Law? 4.e
A)Objects in the solar system move around the Sun in elliptical orbits.
B)The period of revolution increases as the distance from the Sun decreases.
C)The period of rotation increases as the distance from the Sun increases.
D)Objects in the solar system move around the Sun in circular orbits.
4.
Phases of the Moon occur because the Moon _______. 4.d
A)reflects light emitted by all objects in the solar system
B)reflects light emitted by Earth
C)emits light
D)reflects light emitted by the Sun
5.
What force causes a planet to move in an elliptical orbit? 2.g
A)The gravitational force exerted on the planet by long-period comets.
B)The gravitational force exerted by the planet on the Sun.
C)The gravitational force exerted on the planet by the planet's moons.
D)The gravitational force exerted by the Sun on the planet.
6.
The average distance from Pluto to the Sun is about _______. 4.c
A)40 million km
B)40 light years
C)40 AU
D)40,000 AU
7.
Which equals one astronomical unit? 4.c
A)75 million km
B)150 million km
C)100 million km
D)200 million km
8.
A lunar eclipse occurs when _______. 4.d
A)the Moon moves into Earth's shadow
B)Earth moves into the Moon's shadow
C)The Moon moves into the Sun's shadow.
D)the Sun moves into Earth's shadow
9.
Which planet is made mainly of gases? 4.e
A)Mercury
B)Jupiter
C)Pluto
D)Venus
10.
Which planet has the most moons? 4.e
A)Saturn
B)Jupiter
C)Uranus
D)Neptune
11.
The Cassini spacecraft visited which planet? 4.d
A)Pluto
B)Venus
C)Saturn
D)Uranus
12.
Most short-period comets come from the _______. 4.e
A)meteoroid belt
B)Oort cloud
C)asteroid belt
D)Kuiper Belt
13.
Which is a moon of Saturn that has a thick atmosphere 4.e
A)Titan
B)Io
C)Ganymede
D)Europa
14.
The rotation axis of which planet is tilted nearly parallel to the plane of its orbit around the Sun? 4.e
A)Neptune
B)Uranus
C)Pluto
D)Mercury
15.
Which are rocky objects that are found between the orbits of Mars and Jupiter? 4.e
A)meteoroids
B)comets
C)asteroids
D)meteorites
Grade 8
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