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  • 1(current)
Q. No.

Of the ultraviolet radiation that reaches the Earth's surface, more than 95% is:
1. UV A
2. UV B
3. UV C
4. UV radiation reaching Earth has an equal percentage of UV A, UV B, and UV C

Subtopic:  Ozone Layer Depletion |

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Hints

Identify the incorrectly matched pair:

1.

Ozone depletion

DNA damage

2.

Greenhouse effect

Increased atmospheric carbon dioxide

3.

Acid rain

pH < 5

4.

Eutrophication

Decreased primary productivity
Subtopic:  Ozone Layer Depletion | Water Pollution |
 64%

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Ozone hole is:

1. a partial gap in the stratospheric ozone layer over Antarctica
2. a partial gap in the stratospheric ozone layer over Arctic
3. thinning of ozone layers over polar regions
4. excessive buildup of lower troposphere ozone

Subtopic:  Ozone Layer Depletion |
 59%
From NCERT

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Match the items in column I and column II and choose the correct option:

Column I Column II
A. UV i. Biomagnifications
B. Biodegradable organic matter ii. Eutrophication
C. DDT iii. Snow blindness
D. Phosphates iv. BOD

Options: A B C D
1. ii i iv iii
2. iii ii iv i
3. iii iv i ii
4. iii i iv ii

Subtopic:  Ozone Layer Depletion | Water Pollution |
 91%
From NCERT

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The common misconceptions regarding ozone depletion include:

I. Since CFC molecules are heavier than air (nitrogen or oxygen), the CFC molecules cannot reach the stratosphere in a significant amount.
II. Natural sources of tropospheric chlorine are four to five times larger than man-made ones and are responsible for ozone depletion.
III. The ozone hole should be above the sources of CFCs.

1. Only I and II 2. Only I and III
3. Only II and III 4. I, II, and III
Subtopic:  Ozone Layer Depletion |
 58%

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Hints

Consider the following statements:

1. The “bad” ozone is the ozone that is formed in the troposphere.
2. The “good ozone” in the stratosphere acts as a shield against harmful UV radiation.
3. UV-A radiations can cause skin cancers and snow-blindness cataracts.


Which of the above statements are true?

1. I and II only 2. I and III only
3. II and III only 4. I, II, and III

Subtopic:  Ozone Layer Depletion |
 71%
From NCERT

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