RRB Junior Engineer (JE) Sample Paper: General Science-28

1. Which one of the following is extensively used for sterilizing water ?

(a) Bleaching powder
(b) Alum
(c) Borax powder
(d) Soda powder

2. The major constituent of air is

(a) nitrogen
(b) carbon dioxide
(c) oxygen
(d) hydrogen

3. Rusting of iron takes place due to

(a) oxidation
(b) carbonation
(c) exfoliation
(d) corrosion

4. German silver used for making utensils is an alloy of

(a) copper silver nickel
(b) copper zinc nickel
(c) copper zinc aluminium
(d) copper nickel aluminium

5. The purity of gold is expressed in carats. The purest form of goldis.

(a) 24 carats
(b) 6 carats
(c) 916 carats
(d) 22 carats

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1(c), 2(d), 3(b), 4(b), 5(b)