Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

Chemistry MCQs For WBCS Prelims P10


Page 10

170391. Which among the following is called 'Laughing Gas' popularly?
A
Nitrogen pentaoxide
B
Nitrogen
C
Nitric oxide
D
Nitrous oxide
D
Correct Answer: D. Nitrous oxide
170492. Neutron was discovered by
A
Rutherford
B
Neil Bohr
C
J. Chadwick
D
J. J. Thomson
C
Correct Answer: C. J. Chadwick
170593. Colloidal particles do not settle down because
A
They carry an electrical charge
B
They become solvated
C
Their specific gravity is very low
D
They are present in far smaller quantity than that of the dispersion medium
D
Correct Answer: D. They are present in far smaller quantity than that of the dispersion medium
253494. The sulight energy used by green plants in photosynthesis istransformed into
A
Chemical energy
B
Physical energy
C
Both a) and b)
D
None
A
0 - 2018
Correct Answer: A. Chemical energy
253595. The ‘laughing gas’ is
A
hydrogen peroxide
B
nitrous oxide
C
carbon monoxide
D
sulphur dioxide
B
0 - 2017
Correct Answer: B. nitrous oxide
253696. Which of the following is also used as a lubricant?
A
Cuprite
B
Graphite
C
Haematite
D
Cryolite
B
0 - 2017
Correct Answer: B. Graphite
253797. Ozone Hole is caused by?
A
acetylene
B
ethylene
C
chlorofluorocarbons
D
methane
C
0 - 2016
Correct Answer: C. chlorofluorocarbons
253898. Strach is a
A
monosaccharide
B
disccharide
C
polysaccharide
D
none of the above
C
0 - 2016
Correct Answer: C. polysaccharide
253999. Vinegar is chemically known as
A
acetic acid
B
butyric acid
C
formic acid
D
tartaric acid
A
0 - 2016
Correct Answer: A. acetic acid
2540100. Which gas is known as ‘noble gas’?
A
hydrogen
B
oxygen
C
helium
D
carbon dioxide
C
0 - 2016
Correct Answer: C. helium



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