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NDA 2018 GAT · General Knowledge · Metals, Alloys and Corrosion · easy

Galvanisation is a process of coating iron with a layer of

Single correct option

Galvanisation is a process of coating iron with a layer of
  1. A. zinc
  2. B. tin
  3. C. copper
  4. D. chromium
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Answer: (A) zinc

Galvanisation coats iron or steel with zinc, which protects it from rusting. Zinc is more reactive than iron, so it corrodes first and protects the iron even if the coating is scratched. Tin plating protects only while the coating is intact, and chromium plating is mainly for appearance and hardness.
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Original question written in the NDA 2018 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake