CBSE
Multiple Choice QuestionsWhich one of the following is not a bioindicator of water pollution?
Sludge-worms
Blood-worms
Stone files
Stone files
Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year
1986
1987
1988
1988
Which one of the flowing is the correct percentage of the two (out of the total of 4 ) green-house gases that contribute to the total global warming?
CFC 14%, CH4 20%
CO2 40% CFCs 30%
N2O 6%, CO2 86%
N2O 6%, CO2 86%
Which one of the following statements is correct?
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil.
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil.
World summit on sustainable development (2002) was held in
Brazil
Sweden
Argentina
Argentina
Which one of the following is being utilised as a source of biodiesel in the Indian countryside?
betroot
sugarcane
pongamia
pongamia
Quercus species are the dominant component in
temperature deciduous forests
alpine forests
scrub forests
tropical rain forests
In which one of the following the BOD (Biochemical Oxygen Demand ) of sewage (s), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?
SE < S < PE < DE
SE < PE < S < DE
PE < S < SE < DE
PE < S < SE < DE
In a coal-fired power plant, electrostatic precipitators are installed to control emission of
SO2
NOX
SPM
SPM
According to central pollution control Board (CPCB), which particulate size in diameter (n micrometres) of the air pollutants is responsible for greatest harm to human health?
2.5 or less
1.5 or less
1.0 or less
1.0 or less
