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

00:00
Question # 1

BOD is

Question # 2

Pick up the correct statement

Question # 3

When chlorofluoro carbon are subjected to U.V. they form

Question # 4

The % of CO2is the atmosphere is

Question # 5

Soil remediation means

Question # 6

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

Question # 7

A pollutant affects

Question # 8

Which step is unnecessary for purification of water for drinking purposes

Question # 9

Chromium (VI) is highly toxic and can cause

Question # 10

The pH range of the acid rain is

Question # 11

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

Question # 12

The region of earth capable of supporting life is

Question # 13

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 # 14

UV radiations bring about

Question # 15

Which heavy metals do not have any safe limits

Question # 16

The largest item which is recycled is

Question # 17

Ozone hole is maximum over

Question # 18

In the atmosphere, O2is about

Question # 19

Phosphate pollution is caused by

Question # 20

The normal amount of overhead ozone is about

Question # 21

The film forming components of paints are

Question # 22

Chief source of water and soil pollution is

Question # 23

Ozone hole refers to

Question # 24

Drained sewage has B.O.D

Question # 25

In purification of potable water the coagulant used is

Question # 26

Which of the following waste material is not recycled for use again

Question # 27

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

Question # 28

Shahi Qilla may be destroyed by

Question # 29

In the atmosphere, CO2is about

Question # 30

B.O.D is connected with

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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 Ecosystem is a smaller unit of
A. Hydrosphere
B. Lithosphere
C. Biosphere
D. Atmosphere
3 Drawback DDT as presticide is
A. I becomes ineffective after some time
B. It is less effective than others
C. It is not easily/rapidly degraded in nature
D. Its high cost
4 Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will bot cause water pollution
A. Live stock waste
B. Agricultural pesticides
C. Oil breaks and spills
D. All of the above
5 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
6 In purification of potable water the coagulant used is
A. Nickle sulpahte
B. Copper sulpahte
C. Barium sulpahte
D. Alum
7 Biodegradable pollutant is
A. Plastic
B. Asbestos
C. Sewage
D. Mercury
8 Acid rains are produced by
A. Excess NO2and SO2 from burining fossil fuels
B. Excess production of NH3by industry and coal gas
C. Excess release of carbon monoxide by incomplete combustion
D. Excess formation of CO2by combustion and animal respiration
9 Eutrophication causes reduction in
A. Dissolved hydrogen
B. Dissolved oxygen
C. Dissolved salts
D. All the above
10 Ultraviolet radiation from sun causes a reaction that produces
A. Fluorides
B. Carbon monoxide
C. Sulphur dioxide
D. Ozone

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