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Railways PYQCBT 1 2016

RRB NTPC · Question 1

Why are aluminum items such as pressure cookers, saucepans, etc. anodized? A. To increase their conductivity. B. To increase their tensile strength. C. To prevent them from rusting. D. To make them lighter and shinier.

  1. A

  2. B

  3. C

  4. D

Show answer & explanation

Answer: (C) C

Explanation

Anodising thickens the natural aluminium oxide layer on the surface electrolytically. This hard oxide coat protects cookers and pans from corrosion (the 'rusting' of aluminium) and wear.