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

Increasing skin cancer and high mutation rate are due to

Question # 2

Phosphate pollution is caused by

Question # 3

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?

Question # 4

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

Question # 5

In the atmosphere, CO2is about

Question # 6

Carbon monoxide is harmful to human beings as it

Question # 7

Atomospheric pollutant is

Question # 8

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 # 9

Burning of fossil fuels is the main source of pollution

Question # 10

Domestic waste mostly constitutes

Question # 11

Ozone hole refers to

Question # 12

Which is not the affect of polluted air on environment

Question # 13

Polycyolic aromatic hydrocarbons are taught to be

Question # 14

The largest item which is recycled is

Question # 15

Spraying of DDT produces pollution of

Question # 16

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

Question # 17

Drawback DDT as presticide is

Question # 18

Atmosphere of big/metropolitan cities is polluted most by

Question # 19

Classical smog occurs in palces of

Question # 20

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

Question # 21

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

Question # 22

Fungicides are the pesticides which

Question # 23

Shahi Qilla may be destroyed by

Question # 24

Chloroflurocarbon releases a chemical harmful to ozone

Question # 25

Which of the following is not an air

Question # 26

One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks

Question # 27

The region of earth capable of supporting life is

Question # 28

Which step is unnecessary for purification of water for drinking purposes

Question # 29

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

Question # 30

Drained sewage has B.O.D

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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 Mottling of teeth is due to presence of an element in drinking water
A. Mercury
B. Fluorine
C. Boron
D. Chlorine
3 Polycyolic aromatic hydrocarbons are taught to be
A. Disinfectant
B. Carcinogenic
C. Helpful
D. Reactive
4 Chromium (VI) is highly toxic and can cause
A. Blindness
B. Cancer
C. Liver problems
D. Blood problems
5 Carbon monoxide is pollutant as it
A. Inactivates nerves
B. Inhibits glycolysis
C. Combines with oxygen
D. Combines with hemoglobin
6 SO2Makes ______ acid rains
A. Carbonic acid
B. Sulfuric
C. Nitric acid
D. All of these
7 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
8 The pH of the rain water in areas where acid rain is the cause of pollution may be
A. 6.5
B. 5.6
C. 4.5
D. 2.2
9 Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water
A. SO2
B. NO2
C. CO
D. A and b only
10 A pollutant affects
A. Human health
B. Quality of life
C. Functioning of ecosystem
D. All of these

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