MDCAT Chemistry Chapter 22 Online Test With Answers

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MDCAT Chemistry Chapter 22 Online Test

Sr. # Questions Answers Choice
1 The incineration may reduce volume of wastes upto: 1/4th 1/2nd 2/3rd 3/4th
2 For incineration temperature range is (in oC) 700-800 800-900 900-1000 1000-1100
3 Leachate contains: fatty acids Bacteria Heavy metals All of these
4 Site of land for landfill is selected based upon. topography location of ground water table All of these
5 The semi solid wastes in landfills is called: Landfill effluents Leachate Incineration
6 a hole used to dump the municipal wastes is called: landfill effluents leachate inclneration
7 Water cover earth surface more than: 50% 60% 70% 80%
8 HOCl is a compound: Polor inorganic organic Ionic covalant
9 Coagulation removes suspended particles in ran water: 60% 70% 80% 90%
10 Insoluble ferric oxide is produced in the pH range: 1 to 8 6 to 9 3 to 13 8 to 13
11 Commonly used coagulants are ions of: Ferrous Al Cr Ferric
12 alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium. sulphates oxides hydroxides chlorides
13 Pathogens in raw water are killed in step: aeration coagulation chlorination treatment
14 Water is made disinfectant during purification of water to the step: aeration coagulation chlorination treatment
15 Chemical like Al2(SO4) or alum are used in purification of water druing step: aeration coagulation chlorination treatment
16 Materials suspended in water or present as colloidal form in raw water are removed by: aeration coagulation chlorination treatment
17 Suspended matter is settled in purification of water by: aeration coagulation chlorination treatment
18 Water is purified by: Filtration aeration coagualation All of these
19 Leather tanneries use big auantities of: Cr Vi salts Cr III salts Mn-salts Pb-salts
20 Which is the most toxic among the given? heavy metals non-metals Metals Metalloids
21 Which one is more toxic? Fe C Hg Ag
22 Chemicals used to kill fungi are: Herbicides Insecticides Pesticides fungicides
23 Chemicals used to kill herbs are: Herbicides Insecticides Pesticides Fungicides
24 Chemicals used to kill pests are: Herbicides Insecticides Pesticides fungicides
25 Chemicals used to kill insects are: Herbicides Insecticides Pesticides Fungicides
26 The most important pesticides are: Herbicides Insecticides Fungicides All
27 Synthetic organic pesticides formulated nowadays are more then: One thousand Ten thousand Two thousands Twenty thousand
28 Many petroleum products are: coloured colourless testy poisoinous
29 Petroleum or crude oil is a complex mixture of compounds mainly: benzene minerals hydrocarbons phenols
30 Diseases like dysentery, typhoid and hepatitis are caused by mixing of in water: Live stock wastes Oil spilage detergents pesticides
31 A single chloride free radical of CFCs can destroy upto ozone molecules: 10 100 1000 100000
32 Chlorofluorocarbons and aerosols are inert in sphere: troposphere stratosphere lithosphere hydrosphere
33 Troposphere extends upto km: 0-15 km 10-15 km 15-40 km 15-40 km
34 Ozone in stratosphere extends upto km: 0-15 km 10-15 km 15-40 km 15-25 km
35 Term ozone hole is used for depletion of ozone during months of: Jan-Feb March - Sep Sep- Nov Dec-Feb
36 By the mid of 1980s depletion of total overhead ozone in antarctic region is 20% 30% 40% 50%
37 Ozone acts as: Pollutant saver oxidatant All of these
38 Ozone is produced in regions: tropical Polor antaric equator
39 A large hole in the ozone layer over antarctica region was discovered in: 1960s 1970s 1980s 1990s
40 Ozone is present in layer around earth: atmosphere tropospher stratosphere thermosphere
41 Ozone layer is high: 20-23 km 22-25 km 23-26 km 25-28 km
42 The normal amount of overhead ozone is about in DU: 150 250 350 450
43 Amount of ozone in atmosphere is expressed in units: Kilograms cm molarity DU
44 Ozone gas has boiling point: Low High Medium Highest
45 Photochemical smog consists of higher concentration of: Oxidants Ozone a &amp; b NO<sub>3</sub>
46 The words smog is a combination of smoke and: fog foke fork fizzy
47 The eleventh concentration of metal cause clogs of gills in fish: Al He Pb Ca
48 Acidification of soil can leach metal: Al Hg Pb Ca
49 Phenomenon of acid rains gain importance in: 1930s 1940s 1950s 1960s
50 Augus smith discovered in the mid of seventeenth century: acid Base Acid rain Fertilizer
51 Men residence time of methane in atmosphere in years is: 1-7 2-7 3-7 4-7
52 Oxides of sulphur react in atmosphere by various reactions to form: sulphates sulphites sulphides sulphate aerosols
53 Coal contains percentage of sulphur: 1-9% 5-9% 6-9% 7-9%
54 The percentage of SO2 produced by volcanoes is: 47% 57% 67% 77%
55 Poisoning of CO can be reveresed by giving oxygen at pressure: low least medium High
56 Transportation causes to produce CO2 in atmosphere: 72% 73% 74% 75%
57 Which is property of CO? Soluble in water Insoluble in water No toxic Pole coloured
58 Carbon Monoxide is: colouriess orderless high toxic All of these
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