The lowest layer of atmosphere is:
- (A) Ionosphere
- (B) Troposphere
- (C) Stratosphere
- (D) Mesosphere
- (B) Troposphere
Moving air is known as:
- (A) Wind
- (B) Climate
- (C) Atmosphere
- (D) Weather
- (A) Wind
Moisture capacity of air is known as:
- (A) Humidity
- (B) Vapors
- (C) Moist
- (D) Wet air
- (A) Humidity
Percentage of Nitrogen by volume in dry air is approximately:
- (A) 70%
- (B) 74%
- (C) 78%
- (D) 80%
- (C) 78%
Percentage of Oxygen by volume in dry air is approximately:
- (A) 21%
- (B) 25%
- (C) 27%
- (D) 29%
- (A) 21%
Percentage of Carbon dioxide by volume in dry air is approximately:
- (A) 0.01%
- (B) 0.02%
- (C) 0.03%
- (D) 0.04%
- (C) 0.03%
Composition of rest of gases other than nitrogen, oxygen and carbon dioxide is about:
- (A) 1%
- (B) 2%
- (C) 3%
- (D) 4%
- (A) 1%
The third abundant gas found in the Earth’s atmosphere is:
- (A) Oxygen
- (B) Nitrogen
- (C) Argon
- (D) Carbon dioxide
- (C) Argon
The amount of argon gas is _______ in air.
- (A) 0.2%
- (B) O.5%
- (C) O.7%
- (D) 0.9%
- (D) 0.9%
The hardest substance available on earth is:
- (A) Silver
- (B) Diamond
- (C) Coal
- (D) Platinum
- (B) Diamond