Question

B. Tick (/) the correct choice.
1. The layer of atmosphere just above the earth is called
(a) troposphere
b) thermosphere
(c) stratosphere
d) mesosphere
2. The ratio of nitrogen to oxygen in the air is
a 1:4
(b) 4:1
(e) 3:1
(d) 1:2
3. Which of the following causes acid rain?
(a) magnesium oxide
b) sulphur anide
(c) oxygen
d) none of these
4. The gas present in the air which helps in burning is
(b) nitrogen
(a) oxygen
(c) carbon dioxide
(d) none of these
5. The main constituent of the air is
(a) oxygen
b) carbon dioxide
(d) angon
(c) nitrogen

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Answer 1

Answer:

1)c

2)1:2

3)none of this

4)oxygen

5)oxygen and nitrogen