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

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

Question # 2

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

Question # 3

A single chlorine free radical can destroy how many ozone molecules

Question # 4

Ecosystem is a smaller unit of

Question # 5

Chlorofluorocarbon, CF2CI2, plays an effective role in removing O3(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

Question # 6

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

Question # 7

Which one is the major reason for pollution in high cities?

Question # 8

Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

Question # 9

Phosphate pollution is caused by

Question # 10

Which is not the condition for the formation of smog

Question # 11

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

Question # 12

DDT is

Question # 13

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

Question # 14

Air pollution is not caused by

Question # 15

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

Question # 16

Which factor is helping to reduce the environmental pollution

Question # 17

Ozone layer of stratosphere requires protection from indiscriminate use of

Question # 18

SO2and NO2produce pollution by increasing

Question # 19

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

Question # 20

Water which his considered to be safe for human consumption is known as

Question # 21

Increased asthmatic attacks in certain seasons are related to

Question # 22

B.O.D is connected with

Question # 23

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

Question # 24

Which of the following forms a toxic substance in blood by combing with hemoglobin?

Question # 25

Drawback DDT as presticide is

Question # 26

Acid rain is due to increase in atmospheric concentration of

Question # 27

In incinerating the waste is burnt at

Question # 28

Depletion of ozone layer is due to

Question # 29

As it passes into food chain, the concentration of DDT

Question # 30

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 Which step is unnecessary for purification of water for drinking purposes
A. Aeration
B. Coagulation
C. Treatment with chlorine
D. Treatment with iodine
2 Which heavy metals do not have any safe limits
A. As
B. Hg
C. Cr
D. All of these
3 DDT is
A. Biodegradable pollutant
B. Nondegradable pollutant
C. Not a pollutant
D. An antibiotic
4 Most hazardous metal pollutant of automobile exhaust is
A. Mercury
B. Lead
C. Cadmium
D. Copper
5 Classical smog occurs in palces of
A. Excess SO2
B. Low temperature
C. High temperature
D. Excess NH3
6 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
7 Oceans cove ______ percent of the surface of the earth
A. 60
B. 70
C. 80
D. 97
8 In the atmosphere, CO2is about
A. 0.01%
B. 0.03%
C. 0.05%
D. 0.09%
9 The film forming components of paints are
A. Resins
B. Thinners
C. Pigments
D. Driers
10 When chlorofluoro carbon are subjected to U.V. they form
A. Cations
B. Anions
C. Free radicals
D. None of these

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