0% 0 Chemical Environmental Engineering Quiz 4 1 / 50 Shouting by a man at his full voice corresponds to a voice level of about ______ decibels? 80 50 25 120 2 / 50 Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about _______ decibels? 180 120 150 90 3 / 50 Scale formation in boiler is controlled by______? Eliminating H2S in feed water Reduction in hardness, silica & alumina in feed water Preheating of feed water Keeping the pH value of feed water just below 7 4 / 50 Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by_________? Neither A. nor B. Both A. & B. Photosynthetic action of algae Natural aeration of water stream 5 / 50 Septic tanks are used for the _______ of the deposited solids? Separation Aerobic decomposition Anaerobic decomposition None of these 6 / 50 Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes________? Odour nuisances Turbidity Foaming Undesirable plant growth 7 / 50 Siderosis is a disease caused by the inhalation of _______ dust? Coal Iron Silica None of these 8 / 50 Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by___________? Lagoons Filtration Biological oxygen pond Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) 9 / 50 The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of ______ of water? Biological oxygen demand Vapor pressure Dissolved oxygen content All A., B. and C. 10 / 50 The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to _______ percent? 8 12 4 1 11 / 50 The Killer gas which caused Bhopal gas tragedy in 1984 was_________? Phosgene Methyl isocyanate (MIC) Sulphur dioxide Carbon monoxide 12 / 50 The maximum CO2 is emitted into the atmosphere by__________? Biomass burning Combustion Urea Trees 13 / 50 Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent_____? Corrosion Scale formation Water-borne disease Dental cavities 14 / 50 Radioactive substances present in the polluted water stream can be removed by__________? Biological oxygen treatment None of these Coagulation and filtration Adsorption in ion exchange materials 15 / 50 The earth?s atmosphere is an envelope of gases present upto a height of about _______ kms? 2000 200 1000 10 16 / 50 The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the _________? Catalytic conversion Green house effect Both B. and C. Global warming 17 / 50 The lowest layer of atmosphere is known as the_______? Ionosphere None of these Stratosphere Troposphere 18 / 50 Smoke is produced due to___________? Insufficient supply of combustion air and insufficient time for combustion All A., B. and C. Poor quality of fuel and improper mixing of fuel & combustion air Poor design & overloading of furnace 19 / 50 The average thickness of ozone layer in stratosphere is about ________ dobson unit (DU)? 1500 20 230 750 20 / 50 Removal of _______ results from the disinfection of water? Turbidity Hardness Bacteria Odour 21 / 50 The main industrial source of emission of hydrogen sulphide air pollutant is_________? Metallurgical roasting & smelting plant Petroleum refineries Pulp and paper plant Coal based thermal power plants 22 / 50 Presence of iron and manganese in water causes_____? Reduction in its dissolved oxygen content None of these Temporary hardness Discoloration of bathroom fixtures 23 / 50 The biological decomposition of organic substances in wastes controlled conditions is called__________? Composting Biological oxidation Incineration None of these 24 / 50 The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ? Benzene hexachloride Alkyl benzene sulphonate (ABS) Chlorine Alkalis 25 / 50 The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is__________? Cavitation Boundary layer separation Fluctuation in liquid flow Pipe vibrations 26 / 50 Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air?s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes__________? Irritation in eyes Respiratory trouble Poor visibility due to sky darkening All A., B. and C. 27 / 50 The main type of sludge gas evolved during sewage treatment in Imhoff tank is_____? CH4 CO CO2 H2 28 / 50 The amount of chemical coagulant added for treatment of polluted water _______ with increase in temperature of the polluted water to be treated? Remain constant Increases May increase or decrease; depends on the chemical characteristics of polluted water Decreases 29 / 50 Radioactive solid nuclear wastes are disposed off by __________? High temperature incineration Underground burial in concrete containers Pyrolysis Pathological incineration 30 / 50 Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ? Enhances the green house effect Causes asphyxia Causes increase in sea level Acts as a green house gas thereby raising earth?s temperature 31 / 50 Sulphur dioxide present in the industrial chimney exhaust gases causes______? Corrosion of building materials Reduction in plant?s productivity owing to acid rain All A., B. and C. Respiratory & lung disease 32 / 50 The common pollutant generated in chlor-alkali industry and battery manufacture is _____? None of these Phosphate Mercury Brine 33 / 50 Presence of soluble organics in polluted water causes__________? Undesirable plants growth Explosion hazards Depletion of oxygen Fire hazards 34 / 50 The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about _____ decibels? 120 105 90 60 35 / 50 Presence of bacteria in potable (drinking) water causes__________? Turbidity Bad odour Disease Bad taste & colour 36 / 50 Ringelmann chart is used for the evaluation of ______ pollution? Air Noise Water Radioactive 37 / 50 Presence of high concentration of ozone and smog in atmospheric air causes the ___________? Embrittlement & decrease of folding resistance of paper Damage of electrical insulator on high tension power line Cracking of rubber products Fading of dye on textiles 38 / 50 Presence of dissolved impurities of _______ is responsible for the red brownish color of water? Carbonates Bi-carbonates Iron & manganese Arsenic 39 / 50 Soluble silica present in boiler feed water can be removed by________? Coagulation Anion exchanger Preheating it Filtration 40 / 50 Salt content in sea water is about _______ percent? 3.5 9.05 1 0.5 41 / 50 The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the__________? None of these Stratosphere Ionosphere Troposphere 42 / 50 The most commonly used chemical coagulant in water treatment is_________? Hydrazine Alum Ferrous sulphate Lime 43 / 50 Presence of excess fluorine in water causes___________? Fluorosis Respiratory disease Dental cavity Tooth decay 44 / 50 Presence of ______ hardness is responsible for the temporary hardness in water? Calcium Chloride Sulphate Carbonate 45 / 50 Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ? ______ percent? 84 88 80 92 46 / 50 Ringelmann chart No. 2 corresponds to ________ percent black smoke? 80 40 10 20 47 / 50 The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by__________? Aerated lagoons Biological oxygen pond Gravity separator having oil skimming devices Trickling filters 48 / 50 Presence of nitrates in water in excess of 50 ppm causes_________? Asphyxiation Gastroenteritis Methemoglobinemia Tooth decay 49 / 50 The function of skimming tank in sewage treatment is to remove ______ substances? Oil & fatty Suspended solid Dissolved solid Gritty & inorganic 50 / 50 Smog is ________? A combination of smoke and fog A liquid particle resulting from vapor condensation Nothing but black smoke A solid particle e.g. fly-ash Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevChemical Environmental Engineering Quiz 3 Chemical Environmental Engineering Quiz 5Next
