Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

General Science (Chemistry) Practice Sets for WBCS, SSC, Rail, UPSC Exam P8

71. Muriatic acid used in household work is a diluted form of
(A) Oxalic acid
(B) Aqua regia
(C) Acetic acid
(D) Hydrochloric acid
Correct Answer: [D] Hydrochloric acid.

72. In underground Railways, the air is purified by using
(A) Oxygen
(B) None of the above
(C) Ozone
(D) Hydrogen peroxide
Correct Answer: [D] Hydrogen peroxide.

73. Ozone depletion in the stratosphere is mainly caused by
(A) Chlorofluorocarbon
(B) Nitric Oxide
(C) Sulphur-di-Oxide
(D) Carbon dioxide
Correct Answer: [A] Chlorofluorocarbon.

74. Which one of the following is not a metal?
(A) Nickel
(B) Silicon
(C) Platinum
(D) Mercury
Correct Answer: [B] Silicon.

75. The volume of a vessel containing an ideal gas is doubled and its temperature (in °K) is also doubled. The pressure of the gas
(A) In one-fourth of the original pressure
(B) Is four times the original pressure
(C) Remains unchanged
(D) Is doubled
Correct Answer: [C] Remains unchanged.

76. Which of the following substances can act as an only reducing agent?
(A) K2Cr2O7
(B) H2S
(C) H2O2

(D) MnO2
Correct Answer: [B] H2S.

77. Hydrogen peroxide has the same number of electrons as (Iso-electronic Species)
(A) CH2 = CH2

Correct Answer: [D] CH3OH

78. Vulcanization is the process of heating rubber with 3-5 % of
(A) Potassium permanganate
(B) Naphthalene
(C) Sulphur
(D) Lime
Correct Answer: [C] Sulphur.

79. Paint & Varnish contains
(A) Mustard oil
(B) Kerosene oil
(C) Linseed oil
(D) Coconut oil
Correct Answer: [C] Linseed oil.

80. Which pollutant of the atmosphere inhibits the Hill reaction of photosynthesis?
(A) Ultraviolet rays
(B) Hydro Carbon
(C) Peroxyacetyl nitrate
(D) Nitrogen monoxide
Correct Answer: [C] Peroxyacyl nitrate.


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