Soal Latihan dan Jawaban Reading Comprehension 39

Thursday, March 22nd, 2012 - reading comprehension

The spectacular aurora light displays that appear in Earth’s atmosphere around the

north and south magnetic poles were once mysterious phenomena. Now, scientists have

data from satellites and ground-based observations from which we know that the

aurora brilliance is an immense electrical discharge similar to that occurring in a

(5)  neon sign.

 

To understand the cause of auroras, first picture the Earth enclosed by its

magnetosphere, a huge region created by the Earth’s magnetic field. Outside the

magnetosphere, blasting toward the earth is the solar wind, a swiftly moving plasma of

ionized gases with its own magnetic filed. Charged particles in this solar wind speed

(10)  earthward along the solar wind’s magnetic lines of force with a spiraling motion. The

Earth’s magnetosphere is a barrier to the solar winds, and forces the charged particles of

the solar wind to flow around the magnetosphere itself. But in the polar regions, the

magnetic lines of force of the Earth and of the solar wind bunch together. Here many of the

solar wind’s charged particles break through the magnetosphere and enter Earth’s

(15)  magnetic field. They then spiral back and forth between the Earth’s magnetic poles

very rapidly. In the polar regions, electrons from the solar wind ionize and excite the

atoms and molecules of the upper atmosphere, causing them to emit aurora radiations

of visible light.

 

The colors of an aurora depend on the atoms emitting them. The dominant greenish

(20)  white light comes from low energy excitation of oxygen atoms. During huge magnetic

storms oxygen atoms also undergo high energy excitation and emit a crimson light.

Excited nitrogen atoms contribute bands of color varying from blue to violet.

 

Viewed from outer space, auroras can be seen as dimly glowing belts wrapped

around each of the Earth’s magnetic poles. Each aurora hangs like a curtain of light

(25)  stretching over the polar regions and into the higher latitudes. When the solar flares

that result in magnetic storms and aurora activity are very intense, aurora displays

may extend as far as the southern regions of the United States.

 

Studies of auroras have given physicists new information about the behavior of

plasmas, which has helped to explain the nature of outer space and is being applied in

(30)  attempts to harness energy from the fusion of atoms.

Reading Comprehension 39

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Question 1
What does the passage mainly discuss?
A
The factors that cause the variety of colors in auroras
B
The methods used to observe auroras from outer space
C
The formation and appearance of auroras around the Earth's poles
D
The periodic variation in the display of auroras
Question 2
The word "phenomena" in line 2 is closest in meaning to
A
colors
B
stars
C
ideas
D
events
Question 3
The word "picture" in line 6 is closest in meaning to
A
explain
B
describe
C
imagine
D
frame
Question 4
The passage describes the magnetosphere as a barrier (line 11) because
A
it increases the speed of particles from the solar wind
B
it is strongest in the polar regions
C
its position makes it difficult to be observed from Earth
D
it prevents particles from the solar wind from easily entering Earth's atmosphere
Question 5
The word "them" in line 17 refers to
A
atoms and molecules
B
aurora radiations
C
electrons
D
polar regions
Question 6
According to the passage, which color appears most frequently in an aurora display?
A
Blue
B
Violet
C
Crimson
D
Greenish-white
Question 7
The word "emit" in line 21 is closest in meaning to
A
connect with
B
add to
C
change from
D
give off
Question 8
The word "glowing" in line 23 is closest in meaning to
A
moving
B
hanging
C
shining
D
charging
Question 9
Auroras may be seen in the southern regions of the United Sates when
A
magnetic storms do not affect Earth
B
the speed of the solar wind is reduced
C
the excitation of atoms is low
D
solar flares are very intense
Question 10
The passage supports which of the following statements about scientists' understanding of auroras?
A
Before advances in technology, including satellites, scientists knew little about auroras.
B
New knowledge about the fusion of atoms allowed scientists to learn more about auroras.
C
Scientists cannot explain the cause of the different colors in auroras.
D
Until scientists learn more about plasma physics, little knowledge about auroras will be available.
Question 11
Which of the following terms is defined in the passage?
A
"electrons" (line 16)
B
"ionize" (line 16)
C
"magnetosphere" (line 7)
D
"fusion" (line 30)
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