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UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following methods of preservation of timber :
1. Dipping
2. Brushing or spraying
3. Pressure impregnation
The correct sequence in decreasing order of the effectiveness of these methods of preservation is

A 1, 2, 3

B 2, 1, 3

C 3, 1, 2

D 3, 2, 1

ANS:C - 3, 1, 2

C is the correct option.