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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Environmental Issues of Biology.
31
The main sources of oceanic pollution are
[1]
oil
[2]
petroleum products
[3]
detergents
[4]
all of these
32
Which one of the following is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming?
[1]
CO2 40%,CFCs 30%
[2]
CFCs 14%, Methane 20%
[3]
Methane 20%, N2O 18%
[4]
N2O 6%, CO2 86%
Answer: CFCs 14%, Methane 20%
33
Ozone layer of upper atmosphere is being destroyed by
[1]
Chlorofluorocarbon
[2]
Photochemical oxidants
[3]
Sulphur dioxide
[4]
Smog
Answer: Chlorofluorocarbon
34
A high Biological Oxygen Demand (BOD) indicates that:
[1]
water is pure
[2]
absence of microbial action
[3]
Low level of microbial pollution
[4]
High level of microbial pollution
Answer: High level of microbial pollution
35
Eutrophication causes decrease in
[1]
Dissolved hydrogen
[2]
Dissolved salts
[3]
Dissolved oxygen
[4]
All of these
36
The pollution which does not persistent harm to life supporting system is
[1]
Noise pollution
[2]
Radiation pollution
[3]
Organochlorine pollution
[4]
All of these
37
Soap and detergents are the source of organic pollutants like:
[1]
glycerol
[2]
polyphosphates
[3]
sulphonated hydrocarbons
[4]
all of these
38
BOD of a pond is related to ______ in per unit volume of water
[1]
All the plants
[2]
All the nektons
[3]
All the microbes
[4]
All the animals
39
Peeling of Ozone umbrella, which protects us from UV rays, is caused by
[1]
CFCs
[2]
CO2
[3]
PAN
[4]
Coal burning
40
Which method is used for the removal of sulphur dioxide and ammonia from the polluted air ?
[1]
Wet scrubbers
[2]
Absorption
[3]
Gravitational method
[4]
Electrostatic precipitator
41
According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?
[1]
5.2 - 2.5
[2]
2.5 or less
[3]
1.5 or less
[4]
1.0 or less
42
Escherichia coli used as an indicator organism to determine pollution of water with
[1]
Industrial effluents
[2]
Heavy metals
[3]
Pollen of aquatic plants
[4]
Faecal matter
43
Which one of the following statements is wrong in case of Bhopal, (India) tragedy?
[1]
It took place in the night of December 2/3/1984
[2]
Methyl Isocyanate gas leakage took place
[3]
Thousands of human beings died
[4]
Radioactive fall out engulfed Bhopal
Answer: Radioactive fall out engulfed Bhopal
44
Which of the environmental pollutions can cause birth defects?
[1]
Smog
[2]
CO
[3]
SO2
[4]
Radioactivity
45
Major aerosol pollutant present in the jet plane emission is
[1]
Carbon monoxide
[2]
Carbon tetrachloride
[3]
Chlorofluorocarbon
[4]
Sulphur dioxide
Answer: Chlorofluorocarbon
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