Question

a
I. Select the correct option:
1. The gas released during respiration is:
(a) oxygen
(b) carbon dioxide
(C) nitrogen dioxide
(d) sulphur dioxide
2. Acid rain is formed due to contribution from the following pair of gases:
(a) methane and ozone
(b) oxygen and nitrous oxide
(c) methane and sulphur dioxide
(d) carbon dioxide and sulphur dioxide
3. Which gas is present in the highest abundance in atmosphere?
(a) Oxygen
(b) Hydrogen
C) Nitrogen
(d) Carbon dioxide
4. A gas is colourless, odourless, heavier than air and extinguishes. Name the gas.
(a) Nitrogen
(b) Carbon dioxide
(C) Hydrogen
(d) Oxygen
5. Hot air balloon rises up in the air because:
(a) hot air is heavier than cold air.
(b) hot air is lighter than cold air.
(c) hot air does not play any role in rising up of the balloon.
(d) hot air contains water vapours which push up the balloon.​

Answer 1

Answer:

1.b

2.d

3.c

4.b

5.d

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