RRB Junior Engineer (JE) Sample Paper: General Science-32

1. Water is not effective in extinguishing a fire caused by petrol because

(a) die flame is too hot for water to cool it down
(b) water and petrol react chemically
(c) water and petrol are miscible with each other
(d) water and petrol are immiscible with each other and petrol which forms the upper layer continues to bum

2. Helium gas is used in gas balloons instead of hydrogen gas because it is

(a) lighter than hydrogen
(b) more abundant than hydrogen
(c) noncombustible
(d) more stable

3. The gas used in the artificial ripening of fruits is

(a) Acetylene
(b) Methane
(c) Ethane
(d) Butane

4. Ruby and sapphire are oxides of

(a) copper
(b) tin
(c) iron
(d) aluminium

5. The gas which turns into liquid at the lowest temperature among the following is

(a) hydrogen
(b) oxygen
(c) helium
(d) nitrogen

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