Catalytic Converters:

I:  use expensive metals like Gold & Tungsten as catalysts
II:  convert unburnt hydrocarbons to CO2 and H2O, CO to CO2 and NO to N2
III:  are deactivated by Lead

1. only I & II are correct
2. only I & III are correct
3. Only II & III are correct
4. I, II & III are correct

Subtopic:  Air Pollution |
 67%
From NCERT

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.


A water body has low DO content. An organism that is likely to flourish here will be:
1. Gonyaulax, an annelid
2. Gonyaulax, a nematode
3. Tubifex, an annelid
4. Tubifex, a nematode

Subtopic:  Water Pollution |
Please attempt this question first.
Hints

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

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.


advertisementadvertisement

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 |

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

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

Subtopic:  Water Pollution |

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.


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

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

Subtopic:  Solid Waste Pollution |

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

advertisementadvertisement

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

Subtopic:  Air Pollution |

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.


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 |

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

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

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.


advertisementadvertisement

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%

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.