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Select the correct statement from the following

  • Bio-gas is produced by the activity of aerobic bacteria on animal waste

  • Methanobacterium is an aerobic bacterium found in rumen of cattle

  • Biogas, commonly called gobar gas, is pure methane

  • Biogas, commonly called gobar gas, is pure methane


C.

Biogas, commonly called gobar gas, is pure methane

Activated sludge is a process dealing with the treatment of sewage and industrial waste waters. Atmospheric air on pure oxygen is introduced to a mixture of primary treated or screened sewage (or industrial waster water) combined with organisms to develop a biological flock, which reduces the organic content of the sewage. Sediment is settlement tanks of sewage treatment plant is a rich source of aerobic bacteria because small amounts are used as inoculum in secondary treatment of biological treatment stage of sewage treatment.

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Which one of the following expanded forms of the followings acronyms is correct?

  • UNEP = United Nations Environmental Policy

  • EPA = Environmental Pollution Agency

  • IUCN = International Union for Conservation of Nature and Natural Resources

  • IUCN = International Union for Conservation of Nature and Natural Resources


Which one of the following statements in wrong in case Bhopal gas tragedy?

  • Thousands of human beings died

  • Radioactive fallout engulfed Bhopal

  • It took place on the night of December 2/3, 1984

  • It took place on the night of December 2/3, 1984


Eutrophication is often seen in 

  • fresh water lakes

  • Ocean

  • Mountains

  • Mountains


Good ozone is found in the 

  • mesosphere

  • troposphere

  • stratosphere

  • stratosphere


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