General Science – Exercise – 2

General Science » Exercise – 2

51. When an iron nail gets rusted, iron oxide is formed

(a) without any change in the weight of the nail
(b) with decrease in the weight of the nail
(c) with increase in the weight of the nail
(d) without any change in colour or weight of the nail

52. Water is a good solvent of ionic salts because

(a) it has a high specific heat
(b) it has no colour
(c) it has a high dipole moment
(d) it has a high boiling point

53. The average salinity of sea water is

(a) 3%
(b) 3.5%
(c) 2.5%
(d) 2%

54. The main constituents of pearls are

(a) calcium oxide and ammonium chloride
(b) calcium carbonate and magnesium carbonate
(c) aragonite and conchiolin
(d) ammonium sulphate and sodium carbonate

55. Which of the following metals remain in liquid for under normal conditions?

(a) Radium
(b) Zinc
(c) Uranium
(d) Mercury

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