Friday, June 18, 2021

WBCS Polity and Constitution MCQs Prelims and Mains

Objective General Science (Chemistry) For Exam Preparation P24


Page 24

90011231. An example of a major air pollutant is
A
Oxygen
B
Carbon monoxide
C
Helium
D
Carbon dioxide
B
Correct Answer: B. Carbon monoxide
90073232. One of the following is used to dissolve noble metals. That is
A
Nitric acid
B
Hydrochloric acid
C
Sulphuric acid
D
Aqua ragia
D
Correct Answer: D. Aqua ragia
90026233. Cement is formed by strongly heating a mixture of
A
limestone and graphite
B
limestone and clay
C
chalk and graphite
D
clay and graphite
B
Correct Answer: B. limestone and clay
90015234. Aspirin is
A
Methoxy benzoic acid
B
Methyl Salicylate
C
Acetyl Salicylic acid
D
Phenyl Salicylate
C
Correct Answer: C. Acetyl Salicylic acid
90125235. The material used in the manufacture of the lead pencil is
A
Graphite
B
Lead
C
Carbon
D
Mica
A
Correct Answer: A. Graphite
90179236. Which of the following is chiefly present in LPG (Liquefied Petroleum Gas)?
A
Methane
B
Ethane
C
Propane
D
Butane
D
Correct Answer: D. Butane
90181237. Which of the following is used as a lubricant in heavy machines?
A
Bauxite
B
Sulphur
C
Phosphorus
D
Graphite
D
Correct Answer: D. Graphite
90055238. Hydrogen bomb is based on the principle of
A
controlled fission reaction
B
uncontrolled fission reaction
C
controlled fusion reaction
D
uncontrolled fusion reaction
D
Correct Answer: D. uncontrolled fusion reaction
90106239. The coating of a thin layer of zinc on steel or iron objects is known as
A
Hot dipping
B
Tinning
C
Galvanising
D
Electroplating
C
Correct Answer: C. Galvanising
90004240. Alum stops bleeding in minor cuts because of
A
solvation
B
emulsion
C
dialysis
D
coagulation
D
Correct Answer: D. coagulation



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