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Planets

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Which planet is closest to the Sun?
a.
Jupiter
c.
Venus
b.
Mars
d.
Mercury
 

 2. 

A characteristic of gaseous planets is that they have
a.
no density.
c.
a density the same as Earth's.
b.
a density greater than Earth's.
d.
a density less than Earth's.
 

 3. 

A hurricane-type cloud known as the Great Red Spot can be found on which planet?
a.
Saturn
c.
Uranus
b.
Mars
d.
Jupiter
 

 4. 

Which statement best explains why there is no atmosphere on the Moon?
a.
The temperature of the Moon varies too much to develop an atmosphere.
b.
The Moon does not have enough gravity to hold an atmosphere.
c.
The Moon revolves too quickly to keep an atmosphere.
d.
The density of the Moon is too great to allow an atmosphere.
 

 5. 

Which planet do scientists think once had surface water or flowing rivers?
a.
Mercury
c.
Mars
b.
Venus
d.
Jupiter
 

 6. 

Venus has the highest surface temperature of all the planets in our solar system. Which is the best explanation for this?
a.
Venus rotates on its axis very slowly.
b.
Venus is very close to the Sun.
c.
Venus revolves around the Sun relatively quickly.
d.
Venus's atmosphere has thick clouds and carbon dioxide.
 

 7. 

The Moon appears to change shape because
a.
the Moon rotates.
c.
Earth revolves around the Sun.
b.
Earth rotates.
d.
the Moon revolves around Earth.
 

 8. 

There are about 24 hours in a day. What would happen to the length of a day if the rotation of Earth sped up?
a.
The length of a day would be shorter.
b.
The length of a day would be longer.
c.
The length of a day would remain the same.
d.
The length of a day would be unpredictable.
 

 9. 

Which statement is true about Venus?
a.
It has polar ice caps and a rust-colored surface.
b.
It has clouds that create a greenhouse effect.
c.
It is the third planet from the Sun.
d.
It rotates on its side and has rings of methane ice.
 

 10. 

It is about 29 days from one full moon to the next. This is because 29 days is about the time it takes for one
a.
revolution of the Moon around Earth.
c.
rotation of the Sun.
b.
revolution of Earth around the Sun.
d.
rotation of Earth.
 

 11. 

When the Moon goes through Earth's shadow, we see a
a.
solar eclipse.
c.
total eclipse.
b.
lunar eclipse.
d.
planetary eclipse.
 

 12. 

A comet is largely made up of
a.
iron and nickel.
c.
petroleum.
b.
rock.
d.
water and ice.
 

 13. 

Which is the largest planet?
a.
Mars
c.
Jupiter
b.
Uranus
d.
Saturn
 

 14. 

Astronomers usually measure the distance from Earth to the Moon in
a.
meters.
c.
light-years.
b.
kilometers.
d.
fathoms.
 

 15. 

The only reusable spacecraft designed to transport astronauts to and from space is a
a.
space probe.
c.
rocket.
b.
satellite.
d.
space shuttle.
 

 16. 

Which planet is characterized by polar ice caps, a pink sky, a rust-colored surface, large volcanoes, and surface channels?
a.
Uranus
c.
Mars
b.
Pluto
d.
Saturn
 

 17. 

Each year, Earth moves once around
a.
Mars.
c.
the Sun.
b.
Venus.
d.
the Moon.
 

 18. 

Which accounts for the fact that a compass can be used to find north on Earth?
a.
Earth has a magnetic field.
c.
Most of Earth is covered by water.
b.
Earth has only one moon.
d.
Earth's temperature is not constant.
 

 19. 

Marty learned that a planet's orbital velocity is related to its distance from the Sun. He noted that orbital velocities range from 4.7 km/sec (Pluto) to 47.8 km/sec (Mercury). Which planet is likely to have an orbital velocity of 5.4 km/sec?
a.
Venus
c.
Mars
b.
Earth
d.
Neptune
 

 20. 

An object in the solar system has many wide, flat craters. What must be true about the object?
a.
It is an asteroid.
b.
It was originally formed with craters.
c.
It has been hit by other objects from space.
d.
It is a planet.
 

 21. 

 Use the table below to answer this question.
mc021-1.jpg


This table shows data for major characteristics of the nine planets in the solar system. (One revolution is the length of time required for a planet to make one complete trip around the Sun; one rotation is the length of time required for a planet to make one complete turn on its axis.)
     Which of the following planets has a day almost the same as a day on Earth?
a.
Pluto
c.
Jupiter
b.
Earth
d.
Mars
 

 22. 

Earth stays in orbit around the Sun because of inertia and
a.
friction.
c.
magnetism.
b.
gravity.
d.
momentum.
 

 23. 

Which is the largest object in the solar system?
a.
Earth
c.
the Sun
b.
Jupiter
d.
the Moon
 

 24. 

 Use the chart below to answer this question.

mc024-1.jpg


The chart shows the average distance of each planet from the Sun and the speed each planet travels in its orbit. Which conclusion should be drawn from this chart?
a.
The planets closer to the Sun travel around the Sun faster.
b.
The planets closer to the Sun absorb the Sun's energy and therefore move faster.
c.
The outer planets move slower because they are larger.
d.
The outer planets move slower because they have many moons.
 

 25. 

If you were to watch the stars all night, they would seem to
a.
stay in exactly the same place in the sky.
b.
move across the sky at night, as the Sun does during the day.
c.
go in circles around the point straight up from where you are.
d.
move across the sky at night, in the opposite direction that the Sun moves during the day.
 



 
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