(b) Pathogens
(c) Clogging of gills by silt
(d) Decrease in D.O.
(a) He 389. BOD is connected with (a) microbes and organic matter
(b) organic matter
(c) microbes
(d) None of the above
(a) Oil slick in sea water increases D.O. value.
(b) The main reason for river water pollution is industrial and domestic sewage discharge.
(c) Surface water contains a lot of organic matter mineral nutrients and radioactive materials.
(d) O2
(a) Stratosphere
(b) Thermosphere
(c) CO2
(d) C O
(a) Farming of green plants
(b) Farming of vegetables in houses
(c) Global warming
(d) Biodegradable pollutant
(a) rich in dissolved oxygen
(b) poor in dissolved oxygen
(c) highly polluted
(d) not suitable for aquatic life
(a) produce colour during reactions
(b) reduce the use and production of hazardous chemicals
(c) are related to the depletion of ozone layer
(d) study the reactions in plants
(a) Chlorofluorocarbons are responsible for ozone layer depletion.
(b) Greenhouse effect is responsible for global warming.
(c) Acid rain is mostly because of oxides of nitrogen and sulphur.
(d) Ozone layer does not permit infrared radiation from the sun to reach the earth.
(a) In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed.(b) Gravity settling chamber removes larger particles from the air.
(c) Cyclone collector removes fine particls in the diameter range 5-20 microns.
(d) Wet scrubbers are used to wash away all types of
particulates.
(d) Feldspar
(a) Carborundum
(c) Cassiterite
(b) Epsomite
(d) Spodumene
(a) CuFeS2 (b) FeS2
(c) KMgCl3.6H2O
(a) Aresenic into the atmosphere
(b) Organic waste into drinking water
(c) Oil spill in water
(d) Industrial waste mercury into fishing water
(a) microbes and organic matter (b) organic matter
(c) microbes
(d) None of the above
(a) Oil slick in sea water increases D.O. value.
(b) The main reason for river water pollution is industrial and domestic sewage discharge.
(c) Surface water contains a lot of organic matter mineral nutrients and radioactive materials.
(d) Oil spill in sea water causes heavy damage to fishery.
(a) Slightly lower than that of rain water without thunderstorm
(b) Slightly higher than that when the thunderstorm is not there
(c) Uninfluenced by occurrence of thunderstorm
(d) Which depends upon the amount of dust in air
(a) vegetation
(b) aquatic creature
(d) air
(a) pH of drinking water should be between 5.5 – 9.5.
(b) Concentration of DO below 6 ppm is good for the growth of fish.
(c) Clean water would have a BOD value of less than 5 ppm.
(d) Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.
(a) Argentite (c) Haematite
(b) Stibnite
(d) Bauxite
(a) Hg(b) Cu
(c) Pb
(d) Zn
(a) Kupfernical
(b) Dolomite
(c) Malachite
(d) Galena
(a) Bauxite
(b) Malachite
(c) Zinc blende
(d) Feldspar
(a) Carborundum
(c) Cassiterite
(b) Epsomite
(d) Spodumene
(a) CuFeS2
(b) FeS2
(c) KMgCl3.6H2O
(d) Al2O3.2H2O