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 Surface and ground water sources are contaminated by various human activities which of the followings is not a human activity that causes contamination in fresh water live stock waste oil leaks and spills disposal of industrial effluents rain
2 CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy 10,000 20,000 100,000 50,000
3 Which is not the affect of polluted air on environment acid rain smog ozone global warming
4 Which one of the following is not air pollutant gas CO CO<sub>2</sub> NO SO<sub>2</sub>
5 Which factor is helping to reduce the environment pollution rapid growth population urbanization idustrialization increase of plantation
6 A pollutant affects Human affects Quality of life Functioning of ecosystem All of these
7 The 95.5% mass of Lithoshone is made of 11 elements i,e O2, Si, Al, Fe, Ca, Na, K, Mg, Ti, H2and P. Which element is present in trace amount iodine bromine lead carbon
8 The region of earth capable of supporting life is Hydrosphere Lithosphere Biosphere Atmosphere
9 Oceans cove ____________ percent of the surface of the earth 60 70 80 97
10 The % of CO2in the atmosphere is 3.0% 0.03% 0.3% 0.5%
11 Which is not a component of environment? Biosphere Lithosphere Hydrosphere None of these
12 Which one of the following is used as coagulant for purification potable water Copper sulphate Alum Barium sulphate Nickel sulphate
13 Chose a point which is not included in the components of environment Stratosphere Hydrosphere Lithosphere Biosphere
14 Lithosphere has amount of silicon 35.30% 27.72% 40.01% 21.13%
15 Photo chemical smog contains ______ as main reactants Nitrons oxide and unburnt hydrocarbons Nilric oxide and unburnt hydrocarbons No and burnt hydrocarbons N<sub>2</sub>O and burnt hydrocarbons
16 The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from 2 ppm - 6 ppm 2 ppm - 4 ppm 4 ppm - 8 ppm 2 ppm - 3 ppm
17 The cause of minamata disease is the pollution of Arsenic (As) into atomosphere Industrial waste having Hg Organic waste in drinking H<sub>2</sub>O Oil spills in H<sub>2</sub>O
18 Oceans, rivers, streams, leaks, polar ice caps, glaciers and group water reservoirs are included in Atmosphere Lithosphere Hydrosphere Biosphere
19 Surface and ground water sources are contaminated by various human activities. Which of the following is not a human activity that causes contamination in fresh water Rain Live stock waste Oil leaks and spills Disposal of industrial effluents
20 CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory 50,000 10,000 20,000 None of these
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