21. The temperature scale that sets freezing of pure water at 32o F:-
a. Kelvin
b. Fahrenheit
c. Celsius
d. British

Option”B” is correct

Under this system, the Fahrenheit scale is redefined slightly so that the freezing point of water is exactly 32 °F, and the boiling point is exactly 212 °F or 180 degrees higher.
22. The pollutant that causes hole in the ozone layer is-
a. SF6
b. nitrousoxide
c. CFCs
d. PFCs

Option”C” is correct

Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).
23. Ozone depletion is mostly caused by-
a.
b. CCL
c.
d. CO

Option”C” is correct

Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.
24. Which one of the following is the correct percentage of the two green house gases that contribute to the total global warming?
a.
b.
c.
d.

Option”B” is correct

Methane-20%, N2O-18% is the correct percentage of the two green house gases that contribute to the total global warming.
25. Pick out the potent green house gas-
a. CO2
b. N2O
c. CH4
d. O3

Option”C” is correct

Methane (CH4) is the potent green house gas.
26. Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:
a.
b.
c.
d.

Option”C” is correct

A radiation inversion is most commonly observed: just above the ground. Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by: the circulation of heat by the atmosphere and the oceans.
27. The intermediate developmental stages in the ecological succession is called-
a. sere
b.
c.
d.

Option”A” is correct

A seral community (or sere) is an intermediate stage found in ecological succession in an ecosystem advancing towards its climax community.
28. The final stable community in an ecological succession is called the-
a.
b.
c.
d.

Option”C” is correct

The final or stable community in a sere is the climax community or climatic vegetation. It is self-perpetuating and in equilibrium with the physical habitat.
29. Typically, water vapour occupies about what percentage of the air’s volume near the earth’s surface?
a.
b.
c.
d.

Option”D” is correct

Typically, water vapour occupies about less than 4 percent of the air’s volume near the earth’s surface.
30.
Heavy dust can cause-
a.
b.
c.
d.

Option”C” is correct

Heavy dust can cause closure of stomata.
Pages: 1 2 3 4 5 6 7

172 thoughts on “Environmental Science”

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