10th class chemistry unit 6 MCQs
chapter 6 MCQs 10th Class Chemistry
Environment Chemistry The Atmosphere:
1. How many percentage of sunlight is absorbed by atmospheric gases?
a. 24%
b. 12%
c. 3%
d. 18%
2. The two major components of atmosphere are:
a. Nitrogen and oxygen
b. Hydrogen and oxygen
c. Oxygen and water
d. Nitrogen and hydrogen
3. Nitrogen and oxygen are ………% of atmosphere:
a. 99%
b. 80%
c. 75%
d. 90%
4. The volume of CO in dry air by ratio is:
a. 20.94%
b. 0.03%
c. 78.09%
d. 0.93%
5. On which bases atmosphere is divided into four regions?
a. Change in temperature
b. Change in pressure
c. Change in weather
d. Change in radiations
6. Height of stratosphere from earth’s surface is:
a. 50 km
b. 30 km
c. 60 km
d. 40 km
7. Thermosphere layer is at height above earth’s surface is:
a. 50-85 km
b. 0-12 km
c. 85-120 km
d. 12-50 km
8. The major constituents of troposphere are nitrogen and:
a. Oxygen
b. Hydrogen
c. Sulphur
d. Carbon dioxide
9. At the height 85-120 km from earth’s surface is:
a. Stratosphere
b. Troposphere
c. Thermosphere
d. Mesosphere
10. The layer of atmosphere which is next to troposphere and extends up to 50 km is called:
a. Thermosphere
b. Mesosphere
c. Stratosphere
d. Hydrosphere
11. Waste material that pollutes air, water and soil is termed as:
a. Solvent
b. Pollution
c. Solution
d. Pollutant
12. A primary pollutant is:
a. H2CO3
b. CH4
c. H2SO4
d. HNO3
13. Carbon monoxide is harmful to us because:
a. Reduces oxygen carrying ability of hemoglobin
b. Paralysis lungs
c. Makes the blood coagulate
d. Damages lungs tissue
14. Every year there is a rise of …… in atmospheric temperature due to carbon dioxide in air:
a. 0.02°C
b. 2°C
c. 0.01°C
d. 0.05°C
15. A secondary pollutant is:
a. CH4
b. SO2
c. HCl
d. CO2
16. The pH of normal rain water is:
a. 6-6.5
b. 5.5-6
c. 5.6-6
d. 5.4-6
17. The pH of acid rain is:
a. 6-6.5
b. 4
c. 7
d. 5
18. Which one of the metal clogs gills of the fish?
a. Aluminium
b. Iron
c. Lead
d. Copper
20. In which region ozone formed?
a. Mesosphere
b. Troposphere
c. Thermosphere
d. Stratosphere
21. Sea surface is protected from ultraviolet radiations in global warming by:
a. NO2 Gas
b. CO2 Gas
c. O3 Gas
d. SO2 Gas
22. The formula of ozone is:
a. O
b. O2
c. CO
d. O3
23. Which one of the reasons of global warming?
a. Absorption of ultraviolet radiations coming from the sun
b. Absorption of infrared radiation emitted by the earth
c. Emission of ultraviolet radiations by the earth
d. Absorption of infrared radiations coming from the sun
24. Which gas is called greenhouse gas?
a. N2
b. CO2
c. HCl
d. CO
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