Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

WBCS Practice Set on General Science (Chemistry) P9


Page 9

169381. Chemically Aspirin is :
A
Methyl salicylate
B
Ethyl salicylate
C
Acetylsalicylic acid
D
Sodium salicylate
C
Correct Answer: C. Acetylsalicylic acid
169482. Phenyl used in household work is a derivative of
A
Benzene
B
Anthracene
C
Methyl alcohol
D
Tartaric acid
A
Correct Answer: A. Benzene
169583. Dry ice is made up of
A
Hydrocarbon
B
Carbon dioxide
C
Water
D
Chlorine
B
Correct Answer: B. Carbon dioxide
169684. The geometry of SF4 is
A
octahedral
B
see-saw
C
square planar
D
tetrahedral
B
Correct Answer: B. see-saw
169785. The most abundant ions in the Bay of Bengal water are
A
Mg2+ and SO42-
B
Fe2+ and Cl-
C
Na+ and Cl-
D
H+ and OH-
A
Correct Answer: A. Mg2+ and SO42-
169886. The most malleable metal is
A
Iron
B
Gold
C
Platinum
D
Silver
B
Correct Answer: B. Gold
169987. The white vitriol is
A
MgSO4 , 7H2O
B
CuSO4 , 5H2O
C
FeSO4 , 7H2O
D
ZnSO4 , 7H2O
D
Correct Answer: D. ZnSO4 , 7H2O
170088. Rate of radiation of heat from a body is the highest if its surface is
A
Smooth but black
B
Rough but black
C
White
D
Smooth
A
Correct Answer: A. Smooth but black
170189. Galvanization is deposition of
A
tin on iron
B
copper on iron
C
zinc on iron
D
aluminum on iron
C
Correct Answer: C. zinc on iron
170290. How many grams of NaOH are needed to make 100 ml. of a 0.5 M solution of NaOH (Atomic weight : Na = 23, O=16, H=1)
A
4
B
1
C
2
D
20
C
Correct Answer: C. 2



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