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

A pollutant affects

Question # 2

The amount of Si in the lithosphere is about

Question # 3

Shahi Qilla may be destroyed by

Question # 4

Ozone hole refers to

Question # 5

Carbon monoxide is harmful to human beings as it

Question # 6

Acid rains are produced by

Question # 7

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

Question # 8

In purification of potable water the coagulant used is

Question # 9

The amount of oxygen in the lithosphere is about

Question # 10

BOD is

Question # 11

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

Question # 12

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

Question # 13

Polycyolic aromatic hydrocarbons are taught to be

Question # 14

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

Question # 15

Sulphur dioxide affects

Question # 16

Spraying of DDT produces pollution of

Question # 17

A single chlorine free radical can destroy how many ozone molecules

Question # 18

The region of earth capable of supporting life is

Question # 19

Fungicides are the pesticides which

Question # 20

Photochemical smog is caused by

Question # 21

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 # 22

Which one is the most toxic?

Question # 23

Ozone layer of stratosphere requires protection from indiscriminate use of

Question # 24

SO2Makes ______ acid rains

Question # 25

Which is not a method for solid waste management

Question # 26

Eutrophication causes reduction in

Question # 27

The largest item which is recycled is

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 Acid rain is due to increase in atmospheric concentration of
A. Ozone and dust
B. CO2and CO
C. SO3and CO
D. SO2and NO2
2 Drained sewage has B.O.D
A. More than that of water
B. Less than that of water
C. Equal to that of water
D. None of the above
3 Which of the following human activities are contaminating surface and ground waters
A. Pesticides
B. Septic tanks
C. Petroleum and natural gas production
D. All of these
4 Chloroflurocarbon releases a chemical harmful to ozone
A. Fluorine
B. Chlorine
C. Nitrogen peroxide
D. Sulphure dioxdie
5 Which is not the affect of polluted air on environment
A. Acid rain
B. Smog
C. Ozone
D. Global warming
6 Atmosphere of big/metropolitan cities is polluted most by
A. Automobile exhausts
B. Pesticide residue
C. Household waste
D. Radio-active fall out
7 In purification of potable water the coagulant used is
A. Nickle sulpahte
B. Copper sulpahte
C. Barium sulpahte
D. Alum
8 Atomospheric pollutant is
A. CO2
B. CO
C. O2
D. N2
9 The largest item which is recycled is
A. Newspaper
B. Plastic
C. Aluminium
D. Oil
10 The pH range of the acid rain is
A. 8 - 7
B. 7 - 6.5
C. 6.5 - 6
D. Less than 5

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