Slash and burn agriculture leads to nutrient-depleted soils and deforestation if:
1. crash crops are implanted rather than cereals
2. it is practiced in a sufficiently larger area
3. some useful trees are retained by the farmers
4. sufficient time is not allowed for the land to recover
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 |
Burying the radioactive wastes is not acceptable to many people as:
1. there is a risk of groundwater contamination
2. it may explode
3. it will harm the buried dead bodies
4. it may get accumulated in vegetation
The Environment Protection Act was passed in:
1. 1988
2. 1987
3. 1985
4. 1986
Brown air consists of:
1. | Sulphur dioxide | 2. | Nitrogen oxides |
3. | Carbon dioxide | 4. | Ozone |
Photochemical smog does not contain:
1. Ozone
2. NOx
3. PAN
4. Carbon monoxide
Which of the following is not an ill effect of PAN?
1. inhibition of electron transport system in plants
2. damage to chloroplasts in plants
3. acute irritation of eyes in humans
4. leukemia in humans
The pH of normal rainwater is:
1. | 6.0 to 7.0 | 2. | 6.5 to 7.5 |
3. | 5.6 to 6.5 | 4. | less than 5.5 |
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
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