General Science – Exercise – 2

91. The most important ore of aluminium is

(a) galena
(b) calamine
(c) calcite
(d) bauxite

Answer
Answer : (d)
Explanation
Explanation :  Bauxite is an aluminium ore and is the main source of aluminium. Let us discuss.
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92. Air is a/an

(a) compound
(b) element
(c) electrolyte
(d) mixture

Answer
Answer : (d)
Explanation
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93. Balloons are filled with

(a) nitrogen
(b) helium
(c) oxygen
(d) argon

Answer
Answer : (b)
Explanation
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94. Diamond is an allotropic form of

(a) germanium
(b) carbon
(c) silicon
(d) sulphur

Answer
Answer : (b)
Explanation
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95. Light year is a measurement of

(a) speed of aeroplanes
(b) speed of light
(c) Stellar distances
(d) speed of rockets

Answer
Answer : (c)
Explanation
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