The loudness of a sound that a person can withstand without discomfort is about:

1. 150 dB    2. 215 dB
3. 30 dB 4. 80 dB

Subtopic:  Introduction to Pollution & Types |
 52%
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The major source of noise pollution in the world is:
1. Office equipment
2. Transport system
3. Sugar, textile, and paper industries
4. Oil refineries and thermal power plants

Subtopic:  Air Pollution |
 74%

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Match the following and choose the correct option.

Column I Column II
A. Environment Protection Act i. 1974
B. Air prevention & Control of pollution Act ii. 1987
C. Water act iii. 1986
D. Amendment of Air Act to include noise as an air pollutant iv.  1981


The correct match is :

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

Subtopic:  Introduction to Pollution & Types | Air Pollution | Water Pollution |
 84%
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Catalytic converters are fitted into automobiles to reduce the emission of harmful gases. Catalytic converters change unburnt hydrocarbons into:
1. Carbon dioxide and water
2. Carbon monoxide
3. Methane
4. Carbon dioxide and methane

Subtopic:  Air Pollution |
 85%
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It is necessary to remove sulphur from petroleum products to

1.  reduce the emission of sulphur dioxide in exhaust fumes
2.  increase efficiency of automobiles' engines
3.  use sulphur removed from petroleum for commercial purposes
4.  increase the life span of engine silencers
Subtopic:  Air Pollution |
 77%
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Which one of the following impurities is easiest to remove from wastewater?

1. Bacteria 2. Colloids
3. Dissolved solids 4. Suspended solids
Subtopic:  Microbes in Sewage Treatment |
 83%

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Which one of the following diseases is not caused due to contamination of water?

1. Hepatitis-B 2. Jaundice
3. Cholera 4. Typhoid

Subtopic:  Water Pollution |
 87%
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Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of:

1. Carbon 2. Sulphur
3. Calcium 4. Phosphorus

Subtopic:  Water Pollution |
 76%
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Algal blooms impart a distinct colour to water due to:

1.  Their pigments
2.  Excretion of coloured substances
3.  Formation of coloured chemicals in water facilitated by physiological degradation of algae
4.  Absorption of light by algal cell wall

Subtopic:  Water Pollution |
 53%
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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%
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