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Difficulty: EasyDistinguishing Main Idea from Details

Read the following passage carefully:

Proper ventilation in a battery charging room is essential to prevent the dangerous buildup of hazardous fumes. When lead-acid batteries undergo charging, they release hydrogen gas, an odorless substance that is highly flammable and poses severe explosion hazards in enclosed spaces. Mechanical exhaust fans actively draw these vapors out of the facility, while fresh-air intake louvers ensure continuous air replacement to maintain a safe working environment.

True or False: The primary main idea of this passage is that lead-acid batteries release flammable hydrogen gas during charging.

Answer: Answer

Answer

False (The statement identifies a supporting detail rather than the overarching main idea).
The statement is false because it mistakes a supporting detail for the main idea. The overall passage focuses on the critical need for proper room ventilation systems to maintain safety, using the production of hydrogen gas merely as evidence to justify why continuous air exchange is required.

Step-by-Step Solution

1
Identify the central topic and overarching point of the entire passage.
The text opens with the necessity of proper ventilation to prevent dangerous gas buildup and describes how exhaust and intake systems maintain safety.
The main idea must encompass the full scope and primary purpose of the paragraph.
2
Evaluate the functional role of the statement about hydrogen gas generation.
The release of hydrogen gas is a specific factual detail that explains the hazard necessitating the ventilation system.
Distinguishing between the core thesis and supporting evidence determines whether the statement accurately represents the main idea.

Key Concept

Distinguishing between a central thesis (main idea) and subordinate supporting evidence (details).
Estimated Time:45s
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Distinguishing Main Idea from Details

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