41.

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 

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%

World summit on sustainable development (2002) was held in 

• Brazil

• Sweden

• Argentina

• Argentina

Quercus species are the dominant component in 

• temperature deciduous forests

• alpine forests

• scrub forests

• tropical rain forests

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.

Which one of the following is being utilised as a source of biodiesel in the Indian countryside?

• betroot

• sugarcane

• pongamia

• pongamia

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

• NO_X

• SPM

• SPM

Which 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