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

Drained sewage has B.O.D

Question # 2

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

Question # 3

Ultraviolet radiation from sun causes a reaction that produces

Question # 4

The largest item which is recycled is

Question # 5

In water the most important oxidizing agent is dissolved molecular oxygen which ranges from

Question # 6

NO and NO2gases in atmosphere are represented by

Question # 7

The amount of Si in the lithosphere is about

Question # 8

The region of earth capable of supporting life is

Question # 9

Polycyolic aromatic hydrocarbons are taught to be

Question # 10

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

Question # 11

A pollutant affects

Question # 12

Carbon monoxide is harmful to human beings as it

Question # 13

Photochemical smog is caused by

Question # 14

Swage water is purified by

Question # 15

Which heavy metals do not have any safe limits

Question # 16

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

Question # 17

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

Question # 18

Chloroflurocarbon releases a chemical harmful to ozone

Question # 19

Minamata disease is due to pollution of

Question # 20

Ozone in most of the tropical regions acts as a pollutant and causes

Question # 21

Burning of fossil fuels is the main source of pollution

Question # 22

Atmosphere of big/metropolitan cities is polluted most by

Question # 23

Which factor is helping to reduce the environmental pollution

Question # 24

Ecology is a science of environment and deals specially with

Question # 25

Air pollution is not caused by

Question # 26

Which of the following human activities are contaminating surface and ground waters

Question # 27

Which one is the most toxic?

Question # 28

Chromium (VI) is highly toxic and can cause

Question # 29

Shahi Qilla may be destroyed by

Question # 30

Pick up the correct statement

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 In water the most important oxidizing agent is dissolved molecular oxygen which ranges from
A. 2 - 4 ppm
B. 4 - 6 ppm
C. 2 - 5 ppm
D. 4 - 8 ppm
2 Which one is not a pollutant normally?
A. Hydrocarbons
B. Carbon dioxide
C. Carbon monoxide
D. Sulphur dioxide
3 Carbon monoxide is pollutant as it
A. Inactivates nerves
B. Inhibits glycolysis
C. Combines with oxygen
D. Combines with hemoglobin
4 Acid rain is due to increase in atmospheric concentration of
A. Ozone and dust
B. CO2and CO
C. SO3and CO
D. SO2and NO2
5 Which causes water pollution?
A. Smoke/fly ash
B. Automobile exhausts
C. Aeroplnes
D. 2,4-D and pesticides
6 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
7 Which one of the following dissolves more rapidly in blood hemoglobin than oxygen?
A. Ozone
B. Nitrous oxide
C. Sulphure dioxide
D. Carbon monoxide
8 Carbon monoxide is harmful to human beings as it
A. Is carcinogenic
B. Is antagonistic to CO2
C. Has higher affinity for hemoglobin as compared to oxygen
D. Is destructive to O3
9 Ozone hole refers to
A. Hole in ozone layers
B. Reduction in thickness of ozone layer in stratosphere
C. Reduction of thickness of ozone in troposphere
D. Increase concentration of ozone
10 The film forming components of paints are
A. Resins
B. Thinners
C. Pigments
D. Driers

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