Friday, June 18, 2021

WBCS Polity and Constitution MCQs Prelims and Mains

General Science (Chemistry) Practice Sets For Competitive Exam P28


Page 28

90018271. Bhopal gas tragedy is associated with leakage of
A
carbon dioxide
B
nitrogen dioxide
C
sulphur dioxide
D
methyl isocyanate
D
Correct Answer: D. methyl isocyanate
90062272. Litmus is obtained from
A
a bacterium
B
a fungus
C
an alga
D
lichen
D
Correct Answer: D. lichen
90039273. Dry powder fire extinguishers contain
A
sand
B
sand and sodium carbonate
C
sand and potassium carbonate
D
sand and sodium bicarbonate
D
Correct Answer: D. sand and sodium bicarbonate
90053274. Helium gas is filled in ballons because
A
its atomic number is 2
B
it is lighter than air
C
it is one of the constituents of water
D
it is a noble gas
B
Correct Answer: B. it is lighter than air
90021275. Brass is an alloy of
A
Lead and tin
B
Zinc and copper
C
Antimony, tin and lead
D
Zinc, tin and copper
B
Correct Answer: B. Zinc and copper
90050276. Gold dissolves in
A
Hydrochloric acid
B
Nitric acid
C
Aqua-regia
D
Acetic acid
C
Correct Answer: C. Aqua-regia
90160277. What is the most commonly used substance in fluorescent tubes?
A
Sodium oxide and argon
B
Sodium vapor and neon
C
Mercury vapor and argon
D
Mercury oxide and neon
C
Correct Answer: C. Mercury vapor and argon
90070278. Non-stick kitchenwares are coated with
A
PVC
B
Graphite
C
Teflon
D
Silicon
C
Correct Answer: C. Teflon
90129279. The most abundant inert gas in the atmosphere is
A
Helium
B
Neon
C
Argon
D
Krypton
C
Correct Answer: C. Argon
90194280. Which one of the following is radioactive?
A
Cesium
B
Platinum
C
Strontium
D
Thorium
D
Correct Answer: D. Thorium



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