ECAT Pre Engineering Chemistry Chapter 27 MCQ Test With Answer

Question # 1

What is the cause of water pollution

Chemical and bacterial contents in live stock A
The spilled oil in rivers and ponds B
Wide spread use of pesticides C
All of the above D

Question # 2

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

Pb A
Cr B
Hg C
All of these D

Question # 3

Which heavy metals do not have any safe limits

As A
Hg B
Cr C
All of these D

Question # 4

Pollution is

Removal of top soill A
Release of toxic/undesirable materials in enevironment B
Conversation of energy C
All the above D

Question # 5

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

2 - 4 ppm A
4 - 6 ppm B
2 - 5 ppm C
4 - 8 ppm D

Question # 6

Pick up the correct statement

CO which is major pollutant resulting from the combustion of fuels in automobile plays a major role in photochemical smog A
Classical smog has an oxidizing character while the phtochemical smog is reducing in character B
Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours C
During formation of smog the level of ozone in the atmosphere goes down D

Question # 7

Ozone in most of the tropical regions acts as a pollutant and causes

Damages to eyes A
Aggravates asthma B
Chest discomfort C
All of these D

Question # 8

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

Uninfluenced by occurrence of thuderstorm A
Which depends on the amount of dust in air B
Slightly lower than that of rain water without thunderstorm C
Slighlty higher than that when the thunderstom is not there D

Question # 9

The amount of oxygen in the lithosphere is about

35.50% A
40.60% B
56.60% C
50.50% D

Question # 10

Ozone layer of stratosphere requires protection from indiscriminate use of

Fungicides, insecticides, bactericides and medicines A
Aerosols and high flying jets B
Atomic explosions and industrial wastes C
Baloons and turbo-prop aeroplanes D

Question # 11

Which factor is helping to reduce the environmental pollution

Rapid growth of population A
Urbanization B
Industrialization C
Increase of plantation D

Question # 12

Increased asthmatic attacks in certain seasons are related to

Inhalation of seasonal pollen A
Eating of seasonal vegetables B
Low temperature C
Wet and dry environment D

Question # 13

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

Low value A
Higher value B
Both values C
None of these D

Question # 14

Ecology is a science of environment and deals specially with

Stratosphere A
Biosphere B
Lithosphere C
Hydrosphere D

Question # 15

Burning of fossil fuels is the main source of pollution

Nitrogen oxide A
Nitric oxide B
Nitrous oxide C
Sulphur dioxide D

Question # 16

Classical smog occurs in palces of

Excess SO₂ A
Low temperature B
High temperature C
Excess NH₃ D

Question # 17

Atmosphere of big/metropolitan cities is polluted most by

Automobile exhausts A
Pesticide residue B
Household waste C
Radio-active fall out D

Question # 18

Which one is the most toxic?

Carbon A
CO B
CO₂ C
SO₂ D

Question # 19

Drained sewage has B.O.D

More than that of water A
Less than that of water B
Equal to that of water C
None of the above D

Question # 20

Chief air pollutant which is likely to deplete ozone layer

Sulphure dioxide A
Carbon dioxide B
Nitrogen oxides and chloro fluorocarbons C

Question # 21

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

Distilled water A
Contaminated water B
Potable water C
Rain water D

Question # 22

Water pollution is mainly due to

Sulphure dioxide A
Carbon dioxide B
Oxygen C
Industrial discharges D

Question # 23

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

Surface water A
Ground water B
Both surface and ground water C
Neither surface nor ground waters D

Question # 24

Most hazardous metal pollutant of automobile exhaust is

Mercury A
Lead B
Cadmium C
Copper D

Question # 25

Sulphur dioxide affects

Cell wall A
Plasmodesmata B
All membrane systems C
Nucleus D

Question # 26

Acid rains are produced by

Excess NO₂and SO₂from burining fossil fuels A
Excess production of NH₃by industry and coal gas B
Excess release of carbon monoxide by incomplete combustion C
Excess formation of CO₂by combustion and animal respiration D

Question # 27

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

10,000 A
20,000 B
100,000 C
50,000 D

Question # 28

Chromium (VI) is highly toxic and can cause

Blindness A
Cancer B
Liver problems C
Blood problems D

Question # 29

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

A
B
C
D

Question # 30

Carbon monoxide is harmful to human beings as it

Is carcinogenic A
Is antagonistic to CO₂ B
Has higher affinity for hemoglobin as compared to oxygen C
Is destructive to O₃ D

Sr.#	Question	Answer
1	Chromium (VI) is highly toxic and can cause	A. Blindness B. Cancer C. Liver problems D. Blood problems
2	Domestic waste mostly constitutes	A. Non-biodegradable pollution B. Biodegradable pollution C. Effluents D. Air pollution
3	Burning of fossil fuels is the main source of pollution	A. Nitrogen oxide B. Nitric oxide C. Nitrous oxide D. Sulphur dioxide
4	B.O.D is connected with	A. Organic matter B. Microbes C. Mircrobes and organic matter D. None of the above
5	Chief air pollutant which is likely to deplete ozone layer	A. Sulphure dioxide B. Carbon dioxide C. Nitrogen oxides and chloro fluorocarbons
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	Which causes water pollution?	A. Smoke/fly ash B. Automobile exhausts C. Aeroplnes D. 2,4-D and pesticides
8	Pollution is	A. Removal of top soill B. Release of toxic/undesirable materials in enevironment C. Conversation of energy D. All the above
9	Chief source of water and soil pollution is	A. Mining B. Thermal power plant C. Agro-industry D. All the above
10	When rain is accompanied by a thunderstorm, the collected rain water will have a pH value	A. Uninfluenced by occurrence of thuderstorm B. Which depends on the amount of dust in air C. Slightly lower than that of rain water without thunderstorm D. Slighlty higher than that when the thunderstom is not there

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