Soal Latihan dan Jawaban Reading Comprehension 14

Thursday, March 15th, 2012 - reading comprehension

Most sources of illumination generate light over an appreciable period, and indeed if

an object is lit for a very brief time(less that 1/25 second), the human eye will not react

in time to see the object. A photographic emulsion—that is, a light-sensitive coating on

photographic film, paper, or glass—will, however, record much shorter bursts of light. A

(5)  photographic flash can therefore be used to capture high-speed movement on film as well

as to correct deficiencies of the normal surrounding lighting. Photoflash is now generated

electronically, but the earliest form, first used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the

bag was ignited, the metal burned with an intense flash. A contemporary observer reported

(10)  that “this quite unsafe device seems to have done nothing worse that engulf the room in

dense smoke and lead to pictures of dubious quality and odd poses.”

 

The evolution of the photoflash was slow, flashbulbs, containing fine wire made of a

metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure

oxygen at low pressure, were introduced only in the 1920’s. In the earliest type, the metal

(15)  was separated from the oxygen by a thin glass bulb. The flash was fired by piercing the

bulb and allowing the oxygen to come into contact with the metal, which ignited

spontaneously. Later bulbs were fired by an electric battery, which heated the wire by

passing a small current through it. Other combinations, such as the pairing of oxygen

difluoride with zirconium, have also been used. In each case enough energy is given out to

(20)  heat the oxidizable metal momentarily to a white-hot emission of visible light. The smoke

particles are so small that they cool rapidly; but since they are white, they contribute to the

brilliance by reflecting the light from their still-glowing neighbors. A slightly bigger form

of the metal will burn for a longer time.

 

Reading Comprehension 14

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Question 1
What does the passage mainly discuss?
A
The history of the photoflash
B
Theories about how the eye reacts to light
C
The dangers of using the early photoflash
D
The technology of modern photography
Question 2
According to the passage,1/25 second is the minimum amount of time required for the
A
generation of artificial light
B
creation of a photographic emulsion
C
human eye to react to light
D
recording of an image on film
Question 3
According to the passage, an advantage of using a photoflash is that it
A
is short enough not to bother human eyes
B
can produce repeated bursts of light
C
intensities colors in photographs
D
supplements existing lighting
Question 4
The word “ignited” in line 9 is closest in meaning to
A
cut into
B
shaken
C
opened
D
set on fire
Question 5
Which of the following phrases is defined in paragraph 1?
A
”photographic emulsion” (line 3)
B
”high-speed movement” (line 5)
C
”appreciable period” (line 1)
D
”odd poses” (line 11)
Question 6
The word “evolution” in line 12 is closest in meaning to
A
adoption
B
development
C
publicity
D
manufacture
Question 7
The function of the glass in the first flashbulbs was to
A
keep the metal and oxygen apart before the flash
B
magnify the light produced by the flash
C
produce the spark that initiated the flash
D
protect the photographer from the heat of the flash
Question 8
The word “it” in line 18 refers to
A
battery
B
oxygen
C
current
D
wire
Question 9
The word “momentarily” in line 20 is closest in meaning to
A
briefly
B
gradually
C
electronically
D
effortlessly
Question 10
According to the passage, the white color of the smoke particles generated by a flashbulb contributes to
A
electrical conductivity
B
bright illumination
C
intense heat
D
rapid cooling
Question 11
According to the passage, a flashbulb can be made to burn longer by using
A
continuous electricity
B
thicker wire
C
more oxygen
D
thinner glass
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