441 Which of the following factors help to measure quallity of water ? Chemistry Medium Full question → A DO B BOD C COD D all of the above
442 Which of the following gases is the main cause of acid rain ? Chemistry Medium Full question → A CO B NO2 C both a & b D none of the above
443 Which of the following is not primary pollutant__________________? Chemistry Medium Full question → A SO3 B CO C NO D H2SO4
444 The yellow colour in photochemical smog is due to presence of__________________? Chemistry Medium Full question → A dinitrogen oxide B nitrogen dioxide C chlorine gas D chlorine dioxide
445 Major cause of SO2 on global scale is__________________? Chemistry Medium Full question → A volcanoes B electric sparks C combustion D all
446 Which of the following is not a secondary pollutant_________________? Chemistry Medium Full question → A ozone B carbonic acid C sulphuric acid D carbon dioxide
447 Requirement of macronutrient per acre of the land is_________________? Chemistry Medium Full question → A 5 to 200 kg B 20-200 kg C 200-400 kg D 30-400 kg
448 Which of the following is not a heavy industry ? Chemistry Medium Full question → A iron B fertilizer C paper D none
449 Pollutants have adverse effect over_________________? Chemistry Medium Full question → A Biosphere B Ecosystem C Both a & b D Hydrosphere
450 The main product of bacterial action is_________________? Chemistry Medium Full question → A Nox B NO2 C N2O3 D NO
451 The percentage of suspended solid waste in raw water is removed by coagulation is__________________? Chemistry Medium Full question → A 60 B 70 C 80 D 90
452 Which one of the following makes the bulk of hydrospheres content ? Chemistry Medium Full question → A oceans B glaciers & icecaps C fresh water lakes and ponds D All have equal distribution
453 Which substance can be used for disinfecting water ? Chemistry Medium Full question → A KMnO4 B Alums C Ozone D All
454 The main pollutant of leather tanneries in the waste water is____________________? Chemistry Medium Full question → A chromium III B chromium IV C chromium V D chromium VI
455 Newspaper can be recycled again and again how many times ? Chemistry Medium Full question → A 2 B 3 C 4 D 5
456 In the purification of portable water the coagulant used is_________________? Chemistry Medium Full question → A alum B nickel sulphate C copper sulphate D barium sulphate
457 Which statement is wrong ? Chemistry Medium Full question → A the amount of ozone layer is greater in the region close to the equator B ozone acts as filter for UV radiations C in the equatorial region it acts as pollutant D CFCs play effective role in removing O3 in the stratosphere
458 Which of the following air pollutants is more dangerous for ozone layer ? Chemistry Medium Full question → A CFC B CO2 C CO D Oxides of nitrogen
459 In which of the following layer of atmosphere there is more thickness of ozone layer ? Chemistry Medium Full question → A troposphere B stratosphere C mesosphere D photosphere
460 Which of the following is not a condition for the formation of smog ? Chemistry Medium Full question → A sufficient NO B sunlight C less movement of air D winds