Q.17. What is the percentage of nitrogen in air?
(a) 50%
(b) 20 %
(c) 1%
(d) 78%
Q.18. "Air contains water vapour" This can be shown by
(a) dust particles
(b) smoke
(c) drops of water
(d) nitrogen gas
Q.19. “The candle goes off when the burning candle is covered with glass tumbler". is necessary for burning.
This shows
(a) oxygen
(b) nitrogen
(c) carbon dioxide
(d) hydrogen
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Answer:
Ans 17- 78%
Ans18- drops of water
Ans19- oxygen
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Q.17
D. 78%
Q.18
B. smoke
Q.19
A. oxygen
Please mark as branalist.
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