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Materials and Components - Engineering

Q1:

Consider the following materials
  1. Nickel
  2. Silver
  3. Oxygen
  4. Aluminium
The correct sequence in the order of decreasing permeability is

A 1, 4, 3, 2

B 1, 4, 2, 3

C 4, 1, 3, 2

D 4, 1, 2, 3

ANS:B - 1, 4, 2, 3

Nickel<Aluminium<Silver<Oxygen.