Galvanising (i.e., zinc coating) of steel sheets is done to______________________?
Correct answer: C. Both A. & B.
- A. Prevent its rusting by contact with corrosive atmosphere
- B. Protect the base metal by cathodic protection
- C. Both A. & B.
- D. Neither A. nor B.
Explanation
Zinc galvanising forms a physical barrier against the atmosphere and also acts sacrificially, corroding preferentially to protect exposed steel. Therefore both stated purposes are valid.
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