Question detail

Which of the following statements about barrier coatings is true?

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Using materials

Question

A. They must be reapplied frequently to remain effective.
B. They chemically react with the metal to prevent corrosion.
C. They are only effective in dry environments.
D. They can be made from any type of material.

Answer

The correct option is They must be reapplied frequently to remain effective.. This answer is correct because it matches the approved learning objective to explain how barrier coatings such as grease, paint and electroplating prevent corrosion. (Chemistry only) in the subtopic Corrosion and its prevention.

Explanation

The correct option is They must be reapplied frequently to remain effective.. They must be reapplied frequently to remain effective. is correct because it directly supports the approved learning objective to explain how barrier coatings such as grease, paint and electroplating prevent corrosion. (Chemistry only). This belongs to the subtopic Corrosion and its prevention within Using materials, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Corrosion and its prevention.

Common mistake

Misunderstanding Barrier Coatings

Students often think that barrier coatings completely stop corrosion rather than just slowing it down.

Emphasize that barrier coatings like grease, paint, and electroplating create a protective layer that reduces exposure to air and water, thus slowing down the corrosion process.

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