RRB Junior Engineer (JE) Sample Paper: General Science-27

1. When formaldehyde and potassium hydroxide are heated we get

(a) Acetylene
(b) Methyl alcohol
(c) Methane
(d) Ethyl formate

2. When cone H2S04 is added to dry KNO3 brown fumes are evolved. These fumes are due to

(a) S03
(b) S02
(c) N02
(d) N2O

3. The polymer used in making plastic crockery is

(a) Decron
(b) Nylon
(c) Bakelite
(d) Melamine

4. Vulcanization of rubber is carried out by adding

(a) Sulphur
(b) Carbon
(c) Ozone
(d) Phosphorus

5. Which gas is used as fire extinguisher?

(a) Carbon dioxide
(b) Carbon monoxide
(c) Carbon suboxide
(d) Sulphur dioxide

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Study Kit for RRB Junior Engineer EXAM (Phase-1) 

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