MDCAT Chemistry Chapter 21 Environmental Chemistry Online Test With Answers

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MDCAT Chemistry Chapter 21 Environmental Chemistry Online Test

Sr. # Questions Answers Choice
1 During incineration temperature range of non-rotating chamber is 900-1000C° 650-1100C° 950-1300C° 700-900C°
2 Transformation is a cyclic process in which used plactic is Remelted and styrene is added Converted into low quality substance Converted back into original components None of these
3 Water is considered pollutant when value of Do is 6 PPM 8 PPM 03 PPM 10 PPM
4 The process of coagulation can remove suspended solids in raw water about 50% 60% Less than 40% More than 80%
5 Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation AI Hg As Cr(vi)
6 CFCs are mainly used in industries due to Low cost Gaseous nature High reactivity Un stability
7 99.5% mass of lithosphere is made of 03 elements 8 elements 11 elements 15 elements
8 What change in plants indicates toxic effect of SO2 Weathering of leaves Darkening of leaves Falling of leaves Bleaching of leaves
9 An excellent source of energy without causing pollution is Fossil fuel Sun Petroleum Nuclear reactor
10 Hydrosphere includes Seas and rivers Ocean & polar ice caps Ground water All of above
11 Which is not considered as pollutant O<sub>3</sub> CO<sub>2</sub> NO<sub>2</sub> SO<sub>2</sub>
12 Most harmful of biosphere is Deforestation Nuclear fail out Salinity Water logging
13 Exhaust fumes of cars contain which poisonous gas CH<sub>4</sub> C<sub>2</sub>H<sub>6</sub> CO All of these
14 Chlorination of water is effective for Killing pathogens Removing dust Removing hardness Increasing oxygen content
15 It is a biodegradable pollutant Salts of HG DDt Aluminum foil Domestic fuel
16 Biological oxygen demand (BOD) is associated with Organic matter Micro organisms Both a and b None
17 Detergents are surfactants and they reduce the B.P. of water Surface tension of water Wetting ability of water None of these
18 Which of following is primary pollutants N<sub>2</sub>O PAN H<sub>2</sub>SO<sub>4</sub> None of these
19 Which is not an air pollutant N<sub>2</sub> CO NO N<sub>2</sub>O
20 Polar ice caps can melt due to Acid rain Green House Effect Smog Chlorofluorocarbons
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