11. Air is a/an :
(a) compound
(b) element
(c) electrolyte
(d) mixture
Explanation
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12. Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products ?
(a) Television
(b) Refrigerator
(c) Tube light
(d) Cooking gas
Explanation
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13. Balloons are filled with :
(a) nitrogen
(b) helium
(c) oxygen
(d) argon
Explanation
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14. Which metal pollute the air of a big city ?
(a) Copper
(b) Chromium
(c) Lead
(d) Cadmium
Explanation
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15. Which of the following metals remain in liquid for under normal conditions ?
(a) Radium
(b) Zinc
(c) Uranium
(d) Mercury
Explanation
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