12th class (Fsc) Chemistry unit 16 MCQs
chapter 16 MCQs 12th Class Chemistry
Environmental Chemistry:
1. Half of the masses of atmosphere is concentrate in lower:
a. 3.6 km
b. 4.6 km
c. 15 km
d. 5.6 km
2. Lithosphere extends in earth up to- the depth of:
a. 150 km
b. 50 km
c. 30 km
d. 100 km
3. The thickness of atmosphere is:
a. 500 km
b. 1500 km
c. 100 km
d. 1000 km
4. The mass to lithosphere is made of:
a. 11 elements
b. 9 elements
c. 12 elements
d. 10 elements
5. Which one is not the property of CO?
a. Water soluble
b. Help in photosynthesis
c. Highly toxic
d. Lighter than air
6. Which part of atmosphere is near to the earth:
a. Stratosphere
b. Thermosphere
c. Troposphere
d. Mesosphere
7. Biosphere is used;
a. Lithosphere only
b. Hydrosphere only
c. Atmosphere only
d. All of these
8. The element which is present in the large extent in lithosphere?
a. Sodium
b. Oxygen
c. Mg
d. Iron
9. Which feeld produce segnificant amount of methane in the atmosphere?
a. Can sugar field
b. Paddy field
c. Wheat field
d. Cotton field
10. The layer of gases surrounding the earth is called:
a. Lithosphere
b. Atmosphere
c. Biosphere
d. Hydrosphere
11. The radiations absorbed by atmosphere are:
a. Near U.V
b. Visible
c. Cosmic rays
d. Near I.R
12. Rigid rocky earth includes the:
a. Lithosphere
b. Atmosphere
c. Biosphere
d. Hydrosphere
13. Lithosphere extends in earth up to the depth of:
a. 150 km
b. 50 km
c. 30 km
d. 100 km
14. In atmosphere the %age of N2 gas is:
a. 78%
b. 0.9%
c. 58%
d. 21%
15. In atmosphere the percentage of O2 gas is:
a. 78%
b. 0.9%
c. 58%
d. 21%
16. The residence time of NO in atmosphere is:
a. Three days
b. Thirty minutes
c. Four days
d. One day
17. The substance which adversely affects human heated is called:
a. Pollutant
b. Atmosphere
c. Ecosystem
d. Ecosphere
18. A substance is commonly present in car ” exhaust fumes does not pollute the atmosphere, which is that?
a. N2
b. SO2
c. CO
d. NO2
19. SO2 and NO2 cause pollution by increasing:
a. Alkalinity
b. Acidity
c. Buffer action
d. All of these
20. Which of the following is secondary pollutant:
a. PAN
b. CO
c. SO3
d. SO2
21. The major source of CO pollution is:
a. Forest fires
b. Exhaust from automobiles
c. Volcanic eruptions
d. None of these
22. Which of the following air pollutions is quiet killer:
a. CO2
b. NO2
c. NO
d. CO
23. Which substance in a vehicle exhaust results from incomplete combustion of hydrocarbons fuel?
a. H2O
b. CO
c. NO
d. N2
24. The gas that binds strongly with hemoglobin is:
a. Methane
b. Carbon monoxide
c. Nitrogen oxide
d. Carbon dioxide
25. Plastics are pollution problems because plastics are:
a. Burn to produce toxic fumes
b. Made from petroleum
c. Decompose to produce toxic products
d. Inflammable