RRB Junior Engineer (JE) Sample Paper: General Science-29

1. Petroleum consists of a mixture of

(a) Carbohydrates
(b) Carbonates
(c) Hydrocarbons
(d) Carbide?

2. The lustre of the metals is because of

(a) high density due to closed packing of atoms
(b) high polish
(c) reflection of light due to the presence of free electrons
(d) absorption of light due to the presence of cavities

3. One of the following is used to dissolve noble metals. That is

(a) Nitric acid
(b) Hydrochloric acid
(c) Sulphuric acid
(d) Aua ragla

4. An emulsion is a colloid of a

(a) gas in a liuid
(b) liuid in a liuid
(c) liuid in a gas
(d) gas in a solid

5. Percentage of carbon in steel i ranges from

(a) 1 to 5
(b) 5 to 0
(c) 0 to 0
(d) 0 to 0

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1(b), 2(b), 3(b), 4(b), 5(a)