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

Sulphur dioxide affects

Question # 3

Which is not the affect of polluted air on environment

Question # 4

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

Question # 5

Phosphate pollution is caused by

Question # 6

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

Question # 7

Chief source of water and soil pollution is

Question # 8

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

Question # 9

Increased asthmatic attacks in certain seasons are related to

Question # 10

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

Question # 11

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

Question # 12

Swage water is purified by

Question # 13

Eutrophication causes reduction in

Question # 14

Soil remediation means

Question # 15

Drained sewage has B.O.D

Question # 16

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

Question # 17

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

Question # 18

Pick up the correct statement

Question # 19

UV radiations bring about

Question # 20

Ecosystem is a smaller unit of

Question # 21

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

Question # 22

The normal amount of overhead ozone is about

Question # 23

NO and NO2gases in atmosphere are represented by

Question # 24

Chromium (VI) is highly toxic and can cause

Question # 25

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

Question # 26

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

Question # 27

The pH range of the acid rain is

Question # 28

Which step is unnecessary for purification of water for drinking purposes

Question # 29

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

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 Polycyolic aromatic hydrocarbons are taught to be
A. Disinfectant
B. Carcinogenic
C. Helpful
D. Reactive
3 Chlorofluorocarbon, CF2CI2, plays an effective role in removing O3(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone
4 Which gas is not a constituent of atmosphere
A. Xe
B. O3
C. H2
D. F2
5 Mottling of teeth is due to presence of an element in drinking water
A. Mercury
B. Fluorine
C. Boron
D. Chlorine
6 When chlorofluoro carbon are subjected to U.V. they form
A. Cations
B. Anions
C. Free radicals
D. None of these
7 Which is not the affect of polluted air on environment
A. Acid rain
B. Smog
C. Ozone
D. Global warming
8 The pH range of the acid rain is
A. 8 - 7
B. 7 - 6.5
C. 6.5 - 6
D. Less than 5
9 The % of CO2is the atmosphere is
A. 3.0%
B. 0.03%
C. 0.3%
D. 0.5%
10 Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due
A. Combining with oxygen to form carbon dioxide
B. Destruction of hemoglobin
C. Preventing reaction between oxygen and hemoglobin
D. Forming stable compound with hemoglobin

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