General Science MCQs with Answers For UPSC, SSC, WBPSC Exams P6

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51. All reactions involving the chemical decomposition
(A) Are reversible and endothermic.
(B) Maybe reversible or irreversible and exothermic or endothermic.
(C) Are reversible.
(D) Are endothermic

Correct Answer: [B] Maybe reversible or irreversible and exothermic or endothermic..

52. When a helium atom loses an electron, it is converted to a
(A) Deuteron
(B) Helium ion
(C) Proton
(D) particle

Correct Answer: [B] Helium ion.

53. Which ones of the following are called Noble gases?
(A) Argon and Neon
(B) Hydrogen and Neon
(C) Oxygen and Hydrogen
(D) Oxygen and Argon

Correct Answer: [A] Argon and Neon.

54. Chlorine is not a constituent of
(A) Chloroform
(B) Bleaching powder
(C) DDT
(D) Chlorophyll

Correct Answer: [D] Chlorophyll.

55. Which among the following gas was leaked during the Bhopal gas tragedy in 1984?
(A) Methyl isochloride
(B) Methyl isochlorate
(C) Methyl isocyanide
(D) Methyl isocyanate

Correct Answer: [D] Methyl isocyanate.

56. In the manufacture of Vanaspati ghee from vegetable oils, which among the following gas is used?
(A) Hydrogen
(B) Neon
(C) Nitrogen
(D) Carbon dioxide

Correct Answer: [A] Hydrogen.

57. Calculate the shielding suffered by valence electron in fluorine
(A) 5.80
(B) 4.85
(C) 5.20
(D) 4.80

Correct Answer: [D] 4.80.

58. The unit of radioactivity is
(A) Curie
(B) Einstein
(C) Plank
(D) None of the above

Correct Answer: [A] Curie.

59. The toxic chemical element that caused Minamata disease in Japan was
(A) Cadmium
(B) Arsenic
(C) Uranium
(D) Mercury

Correct Answer: [D] Mercury.

60. One of the breakthroughs of Acharya P.C. Roy was to synthesize the following compound
(A) Hg2Cl2
(B) H2O4
(C) HgCl2
(D) HgO

Correct Answer: [C] HgCl2.

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