In an algal bloom, the cause of death of other algae is usually:
1. toxins

2. decreased DO

3. decreased sunlight

4. decreased nutrients

Subtopic:  Water Pollution |
From NCERT

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Identify the incorrectly matched pair with respect to contamination of water:
1. Minamata disease: Mercury
2. Blue bay syndrome: excessive nitrates
3. Black foot disease: excessive arsenic
4. Dental caries: excessive fluoride

Subtopic:  Water Pollution |

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A painful bone condition is produced when the drinking water is contaminated with:
1. Lead
2. Mercury
3. Cadmium
4. Arsenic

Subtopic:  Water Pollution |

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Combustion of solid wastes in the absence of oxygen is known as:

1.  Incineration 2.  Pyrolysis
3.  Anaerobiosis 4.  Burning

Subtopic:  Solid Waste Pollution |

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The intensity of noise beyond which physical discomfort is:
1. 70 dB
2. 80 dB
3. 100 dB
4. 120 dB

Subtopic:  Air Pollution |

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The CPCB has recommended zone-wise ambient noise levels. The limit during the day in residential areas is:
1. 75 dB
2. 65 dB
3. 55 dB
4. 50 dB

Subtopic:  Air Pollution |

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Radiatively active gases do not include:
1. Methane

2. Ammonia

3. Nitrous oxide

4. Chloroflouro carbons

Subtopic:  Green House Effect & Global Warming |
 66%
From NCERT

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Identify the incorrect statement regarding CFCs:

1.  They are synthetic gaseous compounds of carbon and halogens
2.  Major sources are the refrigeration industry and industrial solvents
3.  They have been only recently added to the atmosphere - synthesized during the 20th century
4.  They have a short life in the atmosphere - 5 to 12 years
Subtopic:  Ozone Layer Depletion |
 71%

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The group most profoundly affected by global warming normally is:

1. Plants 2. Insects
3. Birds 4. Mammals
Subtopic:  Green House Effect & Global Warming |
 58%

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Which of the following is not a consequence of global warming?

1. a rise in sea levels
2. a change in precipitation patterns
3. an equatorial shift of many species
4. eruption of plant diseases, pests, and weeds

Subtopic:  Green House Effect & Global Warming |

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