ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 DDT is Biodegradable pollutant Nondegradable pollutant Not a pollutant An antibiotic
2 Depletion of ozone layer is due to Oxides of nitrogen Oxides of carbon Oxides of sulphur None of the above
3 Most hazardous metal pollutant of automobile exhaust is Mercury Lead Cadmium Copper
4 Ozone hole refers to Hole in ozone layers Reduction in thickness of ozone layer in stratosphere Reduction of thickness of ozone in troposphere Increase concentration of ozone
5 Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due Combining with oxygen to form carbon dioxide Destruction of hemoglobin Preventing reaction between oxygen and hemoglobin Forming stable compound with hemoglobin
6 Swage water is purified by Microorganisms Light Fishes Aquatic plants
7 Phosphate pollution is caused by Weathering of phosphate rocks only Agricultural fertilizers Phosphate rocks and sewage Sewage and agricultural fertilizers
8 Ozone hole is maximum over Europe Antarctica Asia Africa
9 Water pollution is mainly due to Sulphure dioxide Carbon dioxide Oxygen Industrial discharges
10 Eutrophication causes reduction in Dissolved hydrogen Dissolved oxygen Dissolved salts All the above
11 Chloroflurocarbon releases a chemical harmful to ozone Fluorine Chlorine Nitrogen peroxide Sulphure dioxdie
12 Increasing skin cancer and high mutation rate are due to Acid rain Ozone depletion CO pollution CO<sub>2</sub>Pollution
13 Biodegradable pollutant is Plastic Asbestos Sewage Mercury
14 Soil salinity can be measured by Calorimeter Potometer Porometer Conducitvity meter
15 Which one is the major reason for pollution in high cities? Fossil fuel Acid rain Heat dispersion None of the above
16 BOD is Biological oxygen deficit Biosphere oxygen demand Biological oxygen demand None of the above
17 Which one is the most toxic? Carbon CO CO<sub>2</sub> SO<sub>2</sub>
18 UV radiations bring about Skin cancer Mouth cancer Lung cancer Liver cancer
19 B.O.D is connected with Organic matter Microbes Mircrobes and organic matter None of the above
20 Drained sewage has B.O.D More than that of water Less than that of water Equal to that of water None of the above
21 Drawback DDT as presticide is I becomes ineffective after some time It is less effective than others It is not easily/rapidly degraded in nature Its high cost
22 Carbon monoxide is harmful to human beings as it Is carcinogenic Is antagonistic to CO<sub>2</sub> Has higher affinity for hemoglobin as compared to oxygen Is destructive to O<sub>3</sub>
23 Air pollution is not caused by Pollen grains Hydroelectric power Industries Automobiles
24 Which causes water pollution? Smoke/fly ash Automobile exhausts Aeroplnes 2,4-D and pesticides
25 Chief source of water and soil pollution is Mining Thermal power plant Agro-industry All the above
26 Pollution is Removal of top soill Release of toxic/undesirable materials in enevironment Conversation of energy All the above
27 Acid rain is due to increase in atmospheric concentration of Ozone and dust CO<sub>2</sub>and CO SO<sub>3</sub>and CO SO<sub>2</sub>and NO<sub>2</sub>
28 Classical smog occurs in palces of Excess SO<sub>2</sub> Low temperature High temperature Excess NH<sub>3</sub>
29 Shahi Qilla may be destroyed by Flood in Ravi Temperature mediated spoilage of marble Air pollutants from Lahore chemical industries All the above
30 Ultraviolet radiation from sun causes a reaction that produces Fluorides Carbon monoxide Sulphur dioxide Ozone
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