Writing an Analysis of a Nonfiction Text — Unit test

Question 15 • DAEP-English 7 A(20 Day Term)

Which detail from “Thomas Edison: The Master of Improvement” explains why Swan’s lightbulb failed to be successful?

Answer

“He developed and demonstrated the first small lightbulb in 1878.”

“Its glow was produced by electricity passing through a filament, or tiny piece of material.”

“The inside of the glass bulb was a vacuum. In other words, it was oxygen-free.”

“[The] bulb did not glow for long, however. It produced light for only thirteen hours.”

Explanation

A detail that explains why Swan’s lightbulb failed to be successful is that it did not last long. The passage says the bulb produced light for only thirteen hours, making choice D the explanation. The other choices describe when it was demonstrated, how it made light, or the conditions inside the bulb.

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