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

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

Question # 2

Soil remediation means

Question # 3

Chloroflurocarbon releases a chemical harmful to ozone

Question # 4

Which heavy metals do not have any safe limits

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

Atmosphere of big/metropolitan cities is polluted most by

Question # 7

Spraying of DDT produces pollution of

Question # 8

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

Question # 9

The amount of Si in the lithosphere is about

Question # 10

In Antarctica ozone depletion is due to the formation of following compound

Question # 11

The region of earth capable of supporting life is

Question # 12

Which causes water pollution?

Question # 13

Photochemical smog is caused by

Question # 14

Result of ozone hole is

Question # 15

Domestic waste mostly constitutes

Question # 16

Industrial effuents have toxic synthetic organic compounds as well as heavy metals like

Question # 17

The toxic organic compounds and heavy metals and metalloids results in contamination of

Question # 18

Minamata disease is due to pollution of

Question # 19

The largest item which is recycled is

Question # 20

DDT is

Question # 21

Chief air pollutant which is likely to deplete ozone layer

Question # 22

Ecosystem is a smaller unit of

Question # 23

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

Question # 24

Increasing skin cancer and high mutation rate are due to

Question # 25

As it passes into food chain, the concentration of DDT

Question # 26

Water is often treated with chlorine to

Question # 27

Soil salinity can be measured by

Question # 28

Chromium (VI) is highly toxic and can cause

Question # 29

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

Question # 30

Chromium (VI) is highly toxic and can cause

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 Ozone layer of stratosphere requires protection from indiscriminate use of
A. Fungicides, insecticides, bactericides and medicines
B. Aerosols and high flying jets
C. Atomic explosions and industrial wastes
D. Baloons and turbo-prop aeroplanes
2 In purification of potable water the coagulant used is
A. Nickle sulpahte
B. Copper sulpahte
C. Barium sulpahte
D. Alum
3 Which one of the following dissolves more rapidly in blood hemoglobin than oxygen?
A. Ozone
B. Nitrous oxide
C. Sulphure dioxide
D. Carbon monoxide
4 When chlorofluoro carbon are subjected to U.V. they form
A. Cations
B. Anions
C. Free radicals
D. None of these
5 The normal amount of overhead ozone is about
A. 250 Du
B. 300 DU
C. 350 DU
D. 400 DU
6 B.O.D is connected with
A. Organic matter
B. Microbes
C. Mircrobes and organic matter
D. None of the above
7 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
8 Which step is unnecessary for purification of water for drinking purposes
A. Aeration
B. Coagulation
C. Treatment with chlorine
D. Treatment with iodine
9 Which one is the major reason for pollution in high cities?
A. Fossil fuel
B. Acid rain
C. Heat dispersion
D. None of the above
10 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
A. Live stock waste
B. Oil leaks and spills
C. Disposal of industrial effluents
D. Rain

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