ECAT Pre Engineering Chemistry Chapter 27 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 27 Environmental Chemistry

Try The MCQ's Test For ECAT Chemistry Chapter 27 Environmental Chemistry

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ECAT Chemistry Chapter 27 Environmental Chemistry

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Question # 1

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

Question # 2

Depletion of ozone layer is due to

Question # 3

The 95.5% mass of Lithosphone 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

Question # 4

SO2Makes ______ acid rains

Question # 5

Minamata disease is due to pollution of

Question # 6

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will bot cause water pollution

Question # 7

Which is not the condition for the formation of smog

Question # 8

BOD is

Question # 9

Which one of the following is not air pollutant gas

Question # 10

Pick up the correct statement

Question # 11

Water is often treated with chlorine to

Question # 12

The pH of the rain water in areas where acid rain is the cause of pollution may be

Question # 13

Swage water is purified by

Question # 14

B.O.D is connected with

Question # 15

Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due

Question # 16

Mottling of teeth is due to presence of an element in drinking water

Question # 17

Biodegradable pollutant is

Question # 18

Soil remediation means

Question # 19

Hydrocarbans, SO2, CO, NH3, nitrogen oxides and compounds of fluorine are called

Question # 20

Environmental pollution affects

Question # 21

Eutrophication causes reduction in

Question # 22

Industrial effuents have toxic synthetic organic compounds as well as heavy metals like

Question # 23

Which heavy metals do not have any safe limits

Question # 24

Acid rains are produced by

Question # 25

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

Question # 26

The toxic organic compounds and heavy metals and metalloids results in contamination of

Question # 27

A pollutant affects

Question # 28

The film forming components of paints are

Question # 29

Chlorofluorocarbon, CF2CI2, plays an effective role in removing O3(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

Question # 30

Classical smog occurs in palces of

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 In the atmosphere, O2is about
A. 10%
B. 15%
C. 21%
D. 25%
2 A pollutant affects
A. Human health
B. Quality of life
C. Functioning of ecosystem
D. All of these
3 Exposure to CO results in
A. Headache
B. Fatigue
C. Unconsciousness
D. All of these
4 Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water
A. Low value
B. Higher value
C. Both values
D. None of these
5 Increasing skin cancer and high mutation rate are due to
A. Acid rain
B. Ozone depletion
C. CO pollution
D. CO2Pollution
6 Which heavy metals do not have any safe limits
A. As
B. Hg
C. Cr
D. All of these
7 Pick up the correct statement
A. CO which is major pollutant resulting from the combustion of fuels in automobile plays a major role in photochemical smog
B. Classical smog has an oxidizing character while the phtochemical smog is reducing in character
C. Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours
D. During formation of smog the level of ozone in the atmosphere goes down
8 Shahi Qilla may be destroyed by
A. Flood in Ravi
B. Temperature mediated spoilage of marble
C. Air pollutants from Lahore chemical industries
D. All the above
9 Drained sewage has B.O.D
A. More than that of water
B. Less than that of water
C. Equal to that of water
D. None of the above
10 Fungicides are the pesticides which
A. Control the growth of fungus
B. Kill insects
C. Kill plants
D. Kill herbs

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