General Science – Exercise – 2

71. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

(a) Argon
(b) Xenon
(c) Helium
(d) Krypton

72. Which of the following are the ingredients of gun metal?

(a) Iron, Zinc, Titanium
(b) Iron, tin
(c) Iron, Brass, Tin
(d) Copper, Tin

73. Bell metal is an alloy of

(a) nickel and copper
(b) zinc and copper
(c) brass and nickel
(d) tin and copper

74. Quartz crystals normally used in quartz clocks etc. is chemically

(a) silicon dioxide
(b) germanium oxide
(c) a mixture of germanium oxide and silicon dioxide
(d) sodium silicate

75. The variety of coal in which the deposit contains recognisable traces of the original plant material is

(a) bitumen
(b) anthracite
(c) lignite
(d) peat

Related Posts