RRB Junior Engineer (JE) Sample Paper: General Science-39

1. Photo oxidation process is initiated by

(a) light
(b) heat
(c) oxygen
(d) catalyst

2. Ultraviolet radiation striking this earth is due to the depletion of

(a) carbon monoxide
(b) carbon dioxide
(c) ozone
(d) oxygen

3. Major gaseous pollutant of the thermal power station is

(a) H2S
(b) NH3
(c) NO2
(d) S02

4. The process of removing calcium and magnesium from hard water is known as

(a) Sedimentation
(b) Filtration
(c) Flocculation
(d) Water softening

5. The tip of the matchstick contains

(a) phosphor us pentoxide
(b) white phosphorus
(c) red phosphorus
(d) phosphorus trichloride

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

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