ECAT Pre Engineering Chemistry Chapter 27 MCQ Test With Answer

Question # 1

Pollution is

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

Question # 2

Which factor is helping to reduce the environmental pollution

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

Question # 3

Most hazardous metal pollutant of automobile exhaust is

Mercury A
Lead B
Cadmium C
Copper D

Question # 4

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 # 5

Cyclone collector is used for minimizing

Radioactive pollution A
Air pollution B
Noise pollution C
Water pollution D

Question # 6

Which one of the following is not air pollutant gas

CO A
CO₂ B
NO C
SO₂ D

Question # 7

As it passes into food chain, the concentration of DDT

Remains same A
Decreases B
Increases C
Unpredictable D

Question # 8

The amount of oxygen in the lithosphere is about

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

Question # 9

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

Iodine A
Bromine B
Lead C
Carbon D

Question # 10

The pH of the rain water in areas where acid rain is the cause of pollution may be

6.5 A
5.6 B
4.5 C
2.2 D

Question # 11

Domestic waste mostly constitutes

Non-biodegradable pollution A
Biodegradable pollution B
Effluents C
Air pollution D

Question # 12

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 # 13

BOD is

Biological oxygen deficit A
Biosphere oxygen demand B
Biological oxygen demand C
None of the above D

Question # 14

Ecosystem is a smaller unit of

Hydrosphere A
Lithosphere B
Biosphere C
Atmosphere D

Question # 15

Which gas is not a constituent of atmosphere

Xe A
O₃ B
H₂ C
F₂ D

Question # 16

Which step is unnecessary for purification of water for drinking purposes

Aeration A
Coagulation B
Treatment with chlorine C
Treatment with iodine D

Question # 17

Depletion of ozone layer is due to

Oxides of nitrogen A
Oxides of carbon B
Oxides of sulphur C
None of the above D

Question # 18

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 # 19

The amount of Si in the lithosphere is about

27.72% A
30.35% B
35.30% C
40.21% D

Question # 20

Phosphate pollution is caused by

Weathering of phosphate rocks only A
Agricultural fertilizers B
Phosphate rocks and sewage C
Sewage and agricultural fertilizers D

Question # 21

Ozone hole refers to

Hole in ozone layers A
Reduction in thickness of ozone layer in stratosphere B
Reduction of thickness of ozone in troposphere C
Increase concentration of ozone D

Question # 22

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

Environment A
Hydrosphere B
Pollutant C
Biosphere D

Question # 23

Spraying of DDT produces pollution of

Air A
Air and water B
Air and soil C
Air, water and soil D

Question # 24

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

Combining with oxygen to form carbon dioxide A
Destruction of hemoglobin B
Preventing reaction between oxygen and hemoglobin C
Forming stable compound with hemoglobin D

Question # 25

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 # 26

Sulphur dioxide affects

Cell wall A
Plasmodesmata B
All membrane systems C
Nucleus D

Question # 27

In purification of potable water the coagulant used is

Nickle sulpahte A
Copper sulpahte B
Barium sulpahte C
Alum D

Question # 28

UV radiations bring about

Skin cancer A
Mouth cancer B
Lung cancer C
Liver cancer D

Question # 29

One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks

Blow air A
Add Na₂CO₃ B
Use a specially made sorbent having flouring trapped in it C
Use a sorbent having Al₂O₃trapped in it D

Question # 30

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

Sr.#	Question	Answer
1	Ecosystem is a smaller unit of	A. Hydrosphere B. Lithosphere C. Biosphere D. Atmosphere
2	Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water	A. SO₂ B. NO₂ C. CO D. A and b only
3	Which gas is not a constituent of atmosphere	A. Xe B. O₃ C. H₂ D. F₂
4	Carbon monoxide is harmful to human beings as it	A. Is carcinogenic B. Is antagonistic to CO₂ C. Has higher affinity for hemoglobin as compared to oxygen D. Is destructive to O₃
5	Atomospheric pollutant is	A. CO₂ B. CO C. O₂ D. N₂
6	Depletion of ozone layer is due to	A. Oxides of nitrogen B. Oxides of carbon C. Oxides of sulphur D. None of the above
7	Ozone in most of the tropical regions acts as a pollutant and causes	A. Damages to eyes B. Aggravates asthma C. Chest discomfort D. All of these
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	One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks	A. Blow air B. Add Na₂CO₃ C. Use a specially made sorbent having flouring trapped in it D. Use a sorbent having Al₂O₃trapped in it
10	Sulphur dioxide affects	A. Cell wall B. Plasmodesmata C. All membrane systems D. Nucleus

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