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Multiple Choice Quiz
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1

How did William Herschel know that Uranus is a planet and not a star?
A)it was too bright to be a star
B)he saw it move among the stars from night to night
C)all of the stars in that part of the sky had already been accounted for
D)he could see cloud features on Uranus
2

Which of the following planets occasionally has its poles pointed almost directly at the sun?
A)Mercury
B)Venus
C)Saturn
D)Uranus
3

What is remarkable about the magnetic field of Uranus?
A)it is stronger than that of any other planet
B)it is tipped at a large angle with respect to the axis of rotation
C)there are two north magnetic poles
D)it vanishes and reappears every few minutes
4

What is remarkable about the rotation of Uranus?
A)its rotation period is very long (about 12 years)
B)its rotation axis lies in its orbital plane
C)its rotation axis always points at the sun
D)its rotation period varies wildly from year to year
5

Which of the following statements is a good description of the appearance of Uranus in the Voyager images.
A)circled by wide rings with narrow gaps between them
B)many conspicuous zones and belts in its cloud layer
C)nearly featureless bluish ball
D)distinctly non-spherical in shape
6

Which of the following planets was discovered because of its gravitational effect on the orbits of other planets?
A)Jupiter
B)Saturn
C)Uranus
D)Neptune
7

What is unusual about the obits of Neptune and Pluto?
A)Pluto is sometimes nearer the sun than is Neptune
B)they occasionally have near collisions
C)their years have the same length
D)they are always on opposite sides of the sun from each other
8

What property of Pluto could be determined only after the discovery of its satellite, Charon?
A)its size
B)its mass
C)its age
D)its name
9

What is meant by the statement that Pluto's rotation is synchronous?
A)its rotation period is the same as that of Earth
B)it always keeps the same face turned to the sun
C)it always keeps the same face turned to the Earth
D)it always keeps the same face turned to its satellite
10

How are the Pioneer and Voyager spacecraft most likely to be used to detect trans-Plutonian planets?
A)by running into them
B)by taking pictures of them
C)because their orbits may be altered by them
D)by detecting radio emission from them





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