Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

WBCS Previous Years MCQs on General Science (Chemistry) P5


Page 5

165341. Artificial rain is caused by spraying small pellets of which of the following over clouds?
A
NaOH
B
NH4Cl
C
Ice
D
Dry ice
D
Correct Answer: D. Dry ice
165442. The term PVC used in the plastic industry stands for
A
Poly Vinyl Chloride
B
Phospho Vanadium Chloride
C
Phospho Vinyl Chloride
D
Poly Vinyl Carbonate
A
Correct Answer: A. Poly Vinyl Chloride
165543. Which among the following is responsible for the depletion of the Ozone layer?
A
Chlorofluorocarbon
B
Mercuric oxide
C
Carbon monoxide
D
Carbon dioxide
A
Correct Answer: A. Chlorofluorocarbon
165644. Aluminium powder mixed with linseed oil is used as
A
Insecticide
B
Explosive
C
Paint
D
Fertilizer
C
Correct Answer: C. Paint
165745. The half-life period of an isotope is 2 hours After 6 hours what fraction of the initial quantity of the isotope will be left behind?
A
1/8
B
1/4
C
1/6
D
1/3
A
Correct Answer: A. 1/8
165846. Nuclei of radioactive elements emit
A
Either protons or neutrons
B
Neither protons nor neutrons
C
Neutrons
D
Protons
B
Correct Answer: B. Neither protons nor neutrons
165947. L.P.G. Cylinders contain inside
A
Isobutane and Propane
B
Butane, Isobutane, and Propane
C
Butane and Isobutane
D
Butane and Propane
B
Correct Answer: B. Butane, Isobutane, and Propane
166048. Which one of the following is an element?
A
Graphite
B
Glass
C
Table salt
D
Water
A
Correct Answer: A. Graphite
166149. At constant temperature, if the pressure decrease, then the volume of a given mass of gas will
A
Remain constant
B
May increase or decrease depending on the nature of the gas
C
Increase
D
Decrease
C
Correct Answer: C. Increase
166250. Which of the following is physical change?
A
Magnetizing a needle
B
Rusting of iron
C
Radioactive decay
D
Photosynthesis
A
Correct Answer: A. Magnetizing a needle



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