Name: 
 

Chapter 18 - A Family of Planets - Section 1



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 
 
Below is a diagram of the orbits of the inner planets. Examine the diagram and answer the questions that follow.
test_section1_files/i0020000.jpg
 

1. 

Which line indicates Earth's orbit?
a.
A
c.
C
b.
B
d.
D
 

2. 

Which line indicates Mercury's orbit?
a.
A
c.
C
b.
B
d.
D
 

3. 

Which line indicates the orbit of Venus?
a.
A
c.
C
b.
B
d.
D
 

4. 

Which line indicates the orbit of Mars?
a.
A
c.
C
b.
B
d.
D
 

5. 

On Mercury, you would weigh only 38 percent of what you weigh here on Earth. If you weighed 60 kg here on Earth, how much would you weigh on Mercury?
a.
1.6 kg
c.
38 kg
b.
22.8 kg
d.
60 kg
 

6. 

Of the following, which is the largest body?
a.
the moon
c.
Mercury
b.
Pluto
d.
Ganymede
 

7. 

Which of the following planets is NOT a terrestrial planet?
a.
Mercury
c.
Earth
b.
Mars
d.
Pluto
 

8. 

All of the gas giants have ring systems.
a.
true
b.
false
 

9. 

An astronomical unit (AU) is the average distance
a.
between Mercury and the sun.
c.
light travels in 1 minute.
b.
between Mercury and Pluto.
d.
between Earth and the sun.
 

10. 

Which of these is the best clue that Pluto is NOT a gaseous planet?
a.
the size of its orbit
c.
its distance from the sun
b.
its density
d.
its proximity to the Oort cloud
 

11. 

Which of the following gases traps the most heat in the atmosphere of Venus?
a.
carbon dioxide
c.
nitrogen
b.
oxygen
d.
argon
 

12. 

The amount of time it takes for an object to spin on its axis once is called
a.
period of revolution.
c.
retrograde rotation.
b.
period of rotation.
d.
prograde rotation.
 

13. 

Spinning in a counterclockwise direction is called
a.
prograde rotation.
c.
period of rotation.
b.
retrograde rotation.
d.
period of revolution.
 

14. 

Which of the following is the same for all nine planets?
a.
direction of rotation
c.
direction of revolution
b.
period of rotation
d.
period of revolution
 

15. 

Which inner planet is the coldest?
a.
Earth
c.
Mars
b.
Mercury
d.
Venus
 



 
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