Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

General Science (Chemistry) Practice Sets For WBCS Prelims P2


Page 2

162311. A substance used in metallurgy to remove rock material is called
A
flux
B
gangue
C
matrix
D
slag
A
Correct Answer: A. flux
162412. The compound that can not be kept in glass vessel because it reacts with glass is
A
HF
B
FIBr
C
HNO3
D
HCI
A
Correct Answer: A. HF
162513. Whose presence in drinking water is welcome?
A
As
B
Fe
C
K
D
Ca
C
Correct Answer: C. K
162614. Phosgene is a common name of
A
Phosphine
B
Carbonyl chloride
C
Phosphorus trichloride
D
Phosphorus oxychloride
B
Correct Answer: B. Carbonyl chloride
162715. The purest form of iron is
A
Iron turning
B
Cast iron
C
Wrought iron
D
Stainless steel
C
Correct Answer: C. Wrought iron
162816. Radioactive decay of uranium produces
A
Lead
B
Tin
C
Arsenic
D
Bismuth
A
Correct Answer: A. Lead
162917. Washing soda is the common name for
A
Sodium bicarbonate
B
Sodium hydroxide
C
Sodium carbonate
D
Calcium carbonate
C
Correct Answer: C. Sodium carbonate
163018. In the process of vulcanization which two of the following are heated together?
A
Rubber and Steel
B
Rubber and Lead
C
Rubber and Sulphur
D
Latex and Sulphur
C
Correct Answer: C. Rubber and Sulphur
163119. When a liquid is heated from 20°C to 60°C, its density
A
Decreases
B
Is lost
C
Remains the same
D
Increases
A
Correct Answer: A. Decreases
163220. Equal volumes of different gases at any definite temperature and pressure have
A
equal density
B
equal number of molecules
C
equal weights
D
equal masses
B
Correct Answer: B. equal number of molecules



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