Difficulty: Easy
Correct Answer: An incombustible, fire-resistant material
Explanation:
Introduction:
Asbestos is a naturally occurring fibrous silicate mineral historically used in building materials for its heat resistance and durability. The question tests recognition of its core material property, not just a product form or a misconception about its insulation behavior.
Given Data / Assumptions:
Concept / Approach:
Asbestos fibers are incombustible and withstand high temperatures, which historically made them valuable for fireproofing and heat-insulating applications (e.g., asbestos-cement sheets, insulation lagging). They are mineral (inorganic) fibers, not organic compounds, and they are reasonably good insulators of heat and sound.
Step-by-Step Solution:
Verification / Alternative check:
Comparing typical thermal and acoustic properties with common building materials confirms asbestos is not a poor insulator; it was used precisely because it resists heat and provides insulation (not recommended today due to health risks).
Why Other Options Are Wrong:
Corrugated sheet used for roofing: That is a product form (asbestos-cement sheet), not the defining description of asbestos itself.
An organic substance: Incorrect; asbestos is an inorganic mineral fiber.
A bad insulator: False; it is a good insulator and valued for heat resistance.
Common Pitfalls:
Confusing a product (sheet) with the base material; believing it is organic; assuming poor insulation. The key property is incombustibility and high-temperature resistance.
Final Answer:
An incombustible, fire-resistant material
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