Pollution is a change in physical, chemical or biological characters of our land and water that may be

  • Desirable and harmful to human

  • Desirable and useful to a human

  • Undesirable and harmful to human

  • undesirable and useful to a human

Which is the greatest air pollutant these days

  • Factories

  • Motor vehicles

  • Domestic appliances

  • animals

Removal of the soil by the action of wind and water is known as

  • Erosion

  • Fossilization

  • Leaching

  • Calcification

Acid rain occurs due to atmospheric pollution of 

  •  SO2

  •  NH3

  •  CO2

  •  N2O

Photochemical smog was first observed in -

  • London

  • Los Angeles

  • Paris

  • Tokyo

An increase in CO2 concentration in the atmosphere will result in

  • Adverse effects of natural vegetation

  • Global warming

  • Temperature decrease in a global atmosphere

  • Genetic disorders in plants and animals

Domestic waste will lead to : 

  • Biodegradable pollution

  • Nondegradable pollution

  • Thermal pollution of soil

  • Air pollution

The major source of BOD in the river Ganga is 

  • Leaf litter

  • Fishes

  • Human waste

  • Aquatic plants

If a lake is contaminated with DDT, it's highest concentration would be found in :

  • Primary consumer

  • Secondary consumer

  • Tertiary consumer

  • None of the above.

The most harmful air pollutant produced by automobiles is

  •  HNO2

  •  NOX

  •  SO2

  • CO

Sewage water can be purified by

  • Aquatic plant

  • Microorganism

  • Penicillin

  • Fishes

Major pollutant in Jet plane emission is -

  •  SO2

  • CFC

  • CO

  •  CCl4

B.O.D is-

  • The amount of O2 utilized by organisms in the water 

  • The amount of O2 utilized by microorganisms for decomposition

  • The total amount of O2 present in water

  • All of the above

What is the intensity of sound in normal conversation 

  • 10 -20 decibal

  • 30 - 60 decibal

  • 70 - 90 decibal

  • 120 - 150 decibal

Which of the following is absent in polluted water

  • Hydrilla

  • Water hyacinth

  • Larva of stone fly

  • Blue green algae

Maximum green house gas released by which country

  • India

  • China

  • U.S.A

  • Britain

The ozone layer of the upper atmosphere is being destroyed by : 

  • Sulphur dioxide

  • Carbon dioxide

  • Chlorofluorocarbon

  • Smog

Most hazardous metal pollutant of automobile exhaust is

  • Hg

  • Cd

  • Pb

  • Cu

SO2 pollution is indicated by

  • Grasses

  • Mosses

  • Lichens

  • Fossils

B.O.D is connected with

  • Organic matter

  • Microbes

  • Both

  • None

Acid rain is due to an increase in the atmospheric concentration of : 

  • Ozone, and dust

  •  CO2, and CO

  •  SO3, and CO

  • 4 SO2, and NO2

Soil erosion is greater when

  • Winds do not blow

  • The rainfall is evenly distributed

  • No rain occurs

  • The Rainfall is received in heavy down pour

Soil erosion can be prevented by : 

  • Overgrazing

  • Removal of vegetation

  • Afforestation (Plantation)

  • Increasing bird population

Soil conservation is the process where

  • Soil is aerated

  • Soil erosion is allowed

  • Soil is protected against loss

  • Sterile soil is converted into fertile soil

... is not a greenhouse gas :-
  • Hydrogen
  • Carbon dioxide
  • Methane
  • Nitrous oxide or N2O

The concentration of Peroxy Acetyl Nitrate (PAN) maximum in:-

  • Fog

  • Smoke

  • Smog

  • Photochemical smog

Ozone depletion occurs in : 

 

  • Tropospheric pollution.

  • Stratospheric  pollution.

  • Air pollution.

  • Photochemical smog.

Major component of acid rain is : 

  •  HNO3 

  •  H2SO4

  • HCl

  •  H2CO3

Smog is essentially caused by the presence of -

  •  O2, O3

  •   O2 , N2

  • Oxide of N and S

  •  O3, N2

Assertion(A): Both SO2 and NO2 are major components of air pollution.

Reason(R): SO2 forms reducing smog while NO2 is a component of oxidizing smog.

  • Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

  • Both Assertion & Reason are true but the reason is not the correct explanation of the assertion

  • Assertion is a true statement but Reason is false.

  • Both Assertion and Reason are false statements.

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