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

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 # 2

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

Question # 3

As it passes into food chain, the concentration of DDT

Question # 4

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

Question # 5

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 # 6

Ozone depletion in stratosphere shall result in

Question # 7

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

Question # 8

DDT is

Question # 9

SO2and NO2produce pollution by increasing

Question # 10

Biodegradable pollutant is

Question # 11

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

Question # 12

The amount of oxygen in the lithosphere is about

Question # 13

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

Question # 14

Which factor is helping to reduce the environmental pollution

Question # 15

The % of CO2is the atmosphere is

Question # 16

Which one is not a pollutant normally?

Question # 17

Potable water is considered to be

Question # 18

Which heavy metals do not have any safe limits

Question # 19

The 95.5% mass of Lithosphone is made of 11 elements i.e. O2, Si, Al, Fe, Ca, Na, K, Mg, Ti, H2and P. which element is present in trace amount

Question # 20

Domestic waste mostly constitutes

Question # 21

Ecosystem is a smaller unit of

Question # 22

Carbon monoxide is harmful to human beings as it

Question # 23

Acid rain is due to increase in atmospheric concentration of

Question # 24

Atmosphere of big/metropolitan cities is polluted most by

Question # 25

What is the cause of water pollution

Question # 26

Which gas is not a constituent of atmosphere

Question # 27

Phosphate pollution is caused by

Question # 28

Which one of the following is not air pollutant gas

Question # 29

Chief source of water and soil pollution is

Question # 30

Photochemical smog is caused by

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy
A. 10,000
B. 20,000
C. 100,000
D. 50,000
2 Which step is unnecessary for purification of water for drinking purposes
A. Aeration
B. Coagulation
C. Treatment with chlorine
D. Treatment with iodine
3 Photochemical smog is caused by
A. CO
B. CO2
C. O3
D. NO2
4 Most hazardous metal pollutant of automobile exhaust is
A. Mercury
B. Lead
C. Cadmium
D. Copper
5 In purification of potable water the coagulant used is
A. Nickle sulpahte
B. Copper sulpahte
C. Barium sulpahte
D. Alum
6 BOD is
A. Biological oxygen deficit
B. Biosphere oxygen demand
C. Biological oxygen demand
D. None of the above
7 Carbon monoxide is pollutant as it
A. Inactivates nerves
B. Inhibits glycolysis
C. Combines with oxygen
D. Combines with hemoglobin
8 The normal amount of overhead ozone is about
A. 250 Du
B. 300 DU
C. 350 DU
D. 400 DU
9 A pollutant affects
A. Human health
B. Quality of life
C. Functioning of ecosystem
D. All of these
10 Drawback DDT as presticide is
A. I becomes ineffective after some time
B. It is less effective than others
C. It is not easily/rapidly degraded in nature
D. Its high cost

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