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

Drawback DDT as presticide is

Question # 2

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

Question # 3

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

Question # 4

Increasing skin cancer and high mutation rate are due to

Question # 5

Polycyolic aromatic hydrocarbons are taught to be

Question # 6

Which one of the following dissolves more rapidly in blood hemoglobin than oxygen?

Question # 7

To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be

Question # 8

In the atmosphere, O2is about

Question # 9

UV radiations bring about

Question # 10

Chromium (VI) is highly toxic and can cause

Question # 11

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

Question # 12

Domestic waste mostly constitutes

Question # 13

Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as

Question # 14

Photochemical smog is caused by

Question # 15

Which heavy metals do not have any safe limits

Question # 16

Most hazardous metal pollutant of automobile exhaust is

Question # 17

Ozone hole is maximum over

Question # 18

Shahi Qilla may be destroyed by

Question # 19

In the atmosphere, CO2is about

Question # 20

Chief air pollutant which is likely to deplete ozone layer

Question # 21

A single chlorine free radical can destroy how many ozone molecules

Question # 22

The pH range of the acid rain is

Question # 23

Chief source of water and soil pollution is

Question # 24

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

Question # 25

Ozone hole refers to

Question # 26

Ozone depletion in stratosphere shall result in

Question # 27

B.O.D is connected with

Question # 28

Acid rain is due to increase in atmospheric concentration of

Question # 29

Pollution is

Question # 30

Which one is the most toxic?

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
A. Uninfluenced by occurrence of thuderstorm
B. Which depends on the amount of dust in air
C. Slightly lower than that of rain water without thunderstorm
D. Slighlty higher than that when the thunderstom is not there
2 Phosphate pollution is caused by
A. Weathering of phosphate rocks only
B. Agricultural fertilizers
C. Phosphate rocks and sewage
D. Sewage and agricultural fertilizers
3 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
A. Live stock waste
B. Oil leaks and spills
C. Disposal of industrial effluents
D. Rain
4 Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic
A. It attaches to sulphur of the disulphide link
B. Hg is a heavy metal
C. Hg is liquid at room temperature
D. Hg is non reactive chemically
5 Chromium (VI) is highly toxic and can cause
A. Blindness
B. Cancer
C. Liver problems
D. Blood problems
6 Chlorofluorocarbon, CF2CI2, plays an effective role in removing O3(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone
7 NO and NO2gases in atmosphere are represented by
A. NO
B. NO4
C. NOx
D. NxOy
8 Burning of fossil fuels is the main source of pollution
A. Nitrogen oxide
B. Nitric oxide
C. Nitrous oxide
D. Sulphur dioxide
9 SO2and NO2produce pollution by increasing
A. Alkalinity
B. Acidity
C. Neutrality
D. Buffer action
10 Water is often treated with chlorine to
A. Increase oxygen content
B. Kill germs
C. Remove hardness
D. Remove suspended particles

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