51. Which country contains about 50% of the world’s coal resources?
a.
b. China
c.
d.

Option”D” is correct
52. What is Carcinogen?
a.
b.
c.
d.

Option”C” is correct

A carcinogen is any substance, radionuclide, or radiation that promotes carcinogenesis, the formation of cancer. This may be due to the ability to damage the genome or to the disruption of cellular metabolic processes.
53. The Term Smog was introduced in 1905 by-
a.
b.
c.
d.

Option”A” is correct

Des Voeux coined the term smog in 1905 to describe the condition of fog which has smoke in it. C. J.F.
54. The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere:
a.
b.
c.
d. Ozone

Option”D” is correct

Ozone absorbs ultraviolet radiation but lets other types of radiation, such as visible light, pass through. Molecules of ozone absorb ultraviolet radiation. The ozone gas throughout the stratosphere is called the ozone layer. It absorbs harmful ultraviolet radiation from the Sun.
55. Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of-
a.
b.
c.
d.

Option”A” is correct

Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of chlorofluorocarbon.
56. The inherent ability of organisms to reproduce and multiply is called-
a.
b.
c.
d.

Option”B” is correct

The inherent ability of organisms to reproduce and multiply is called biotic potential.
57. The effect of ozone depletion include-
a.
b.
c.
d.

Option”D” is correct

Ozone layer depletion causes increased UV radiation levels at the Earth’s surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders.
58. The true statement about “green house effect” is that it is-
a.
b.
c.
d.

Option”C” is correct

The true statement about “green house effect” is that it is caused only by CO2, CFC, CH4 and NO2 gases.
59. UV radiations is injurious to plants because it-
a.
b.
c.
d.

Option”D” is correct

UV radiations is injurious to plants because it causes genetic changes.
60. _________ is the regulatory authority of quality in India.
a. CPCB
b. PCBC
c.
d.

Option”A” is correct

CPCB is the regulatory authority of quality in India.
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