Environmental Chemistry 11th Science Lessons
Environmental Chemistry 11th Science Lessons
Quiz-summary
0 of 106 questions completed
Questions:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
Information
Tnpsc Online Test
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 106 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Average score |
|
Your score |
|
Categories
- Not categorized 0%
Pos. | Name | Entered on | Points | Result |
---|---|---|---|---|
Table is loading | ||||
No data available | ||||
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- Answered
- Review
-
Question 1 of 106
1. Question
Who was awarded the Nobel Prize for the development of new chemicals based on Green chemistry in 2005?
Correct
The Nobel Prize in chemistry 2005 was awarded jointly to Yves Chauvin, Robert H. Grubbs and Richard R. Schrock for the development of new chemicals based on Green chemistry.
Incorrect
The Nobel Prize in chemistry 2005 was awarded jointly to Yves Chauvin, Robert H. Grubbs and Richard R. Schrock for the development of new chemicals based on Green chemistry.
-
Question 2 of 106
2. Question
Choose the Incorrect statements.
i) Yves Chauvin explained the types of metal compound catalysts in reactions in the year 1971.
ii) Richard Schrock was one of the people to produce efficient metal compound catalysts for metathesis.
iii) Robert Grubbs developed better catalysts that are stable in air.Correct
In 1971 Yves Chauvin explained the types of metal compound that act as catalysts in the reactions. Richard Schrock was the first to produce efficient metal compound catalysts for metathesis in 1990. Two years later Robert Grubbs developed better catalysts, stable in air that was highlighted in many applications.
Incorrect
In 1971 Yves Chauvin explained the types of metal compound that act as catalysts in the reactions. Richard Schrock was the first to produce efficient metal compound catalysts for metathesis in 1990. Two years later Robert Grubbs developed better catalysts, stable in air that was highlighted in many applications.
-
Question 3 of 106
3. Question
Which of the following are the main objectives of the environmental chemistry?
Correct
Environmental chemistry is a branch of chemistry which deals with the study of chemicals and chemical processes occurring in the environment by direct human activities. It also deals with sources, causes and methods of controlling air, water and soil pollution.
Incorrect
Environmental chemistry is a branch of chemistry which deals with the study of chemicals and chemical processes occurring in the environment by direct human activities. It also deals with sources, causes and methods of controlling air, water and soil pollution.
-
Question 4 of 106
4. Question
Assertion (A): All the substances causes pollution of environment are called as pollutants.
Reasoning(R): The Pollutants may be solid, liquids or gaseous substances.Correct
Environmental pollution is usually caused by the addition of waste products of human activity to the environment. The substances which cause pollution of environment are called pollutants. The pollutants may be solids, liquids or gaseous substances present in significant concentration in the environment.
Incorrect
Environmental pollution is usually caused by the addition of waste products of human activity to the environment. The substances which cause pollution of environment are called pollutants. The pollutants may be solids, liquids or gaseous substances present in significant concentration in the environment.
-
Question 5 of 106
5. Question
Which of the following is not a bio-degradable pollutant?
Correct
Bio-degradable pollutants: The pollutants which can be easily decomposed by the natural biological processes are called bio-degradable pollutants. Examples: plant wastes, animal wastes etc.
Incorrect
Bio-degradable pollutants: The pollutants which can be easily decomposed by the natural biological processes are called bio-degradable pollutants. Examples: plant wastes, animal wastes etc.
-
Question 6 of 106
6. Question
Choose the incorrect statements.
i) Non bio-degradable pollutants cannot be decomposed by the natural biological process.
ii) In low concentration non bio-degradable pollutants are not harmful to living organisms.
iii) Metal wastes, DDT, plastics and nuclear wastes are some of the Non bio-degradable pollutants.Correct
Non bio-degradable pollutants: The pollutants which cannot be decomposed by the natural biological processes are called non bio-degradable pollutants. Examples: metal wastes (mainly Hg and Pb), D.D.T, plastics, nuclear wastes etc., these pollutants are harmful to living organisms even in low concentration. As they are not degraded naturally, it is difficult to eliminate them from our environment.
Incorrect
Non bio-degradable pollutants: The pollutants which cannot be decomposed by the natural biological processes are called non bio-degradable pollutants. Examples: metal wastes (mainly Hg and Pb), D.D.T, plastics, nuclear wastes etc., these pollutants are harmful to living organisms even in low concentration. As they are not degraded naturally, it is difficult to eliminate them from our environment.
-
Question 7 of 106
7. Question
Which of the following is not included in the mixture of air?
Correct
Earth’s atmosphere is a layer of gases retained by the earth’s gravity. It contains roughly 78% nitrogen, 21% oxygen, 0.93% argon, 0.04% carbon dioxide, trace amounts of other gases and little amount of water vapor. This mixture is commonly known as air.
Incorrect
Earth’s atmosphere is a layer of gases retained by the earth’s gravity. It contains roughly 78% nitrogen, 21% oxygen, 0.93% argon, 0.04% carbon dioxide, trace amounts of other gases and little amount of water vapor. This mixture is commonly known as air.
-
Question 8 of 106
8. Question
Which of this region is also known as ozonosphere?
Correct
Incorrect
-
Question 9 of 106
9. Question
Identify the Incorrect match.
A. Stratosphere i) O3
B. Thermosphere ii) NO+
C. Mesosphere iii) e-Correct
Regions of atmosphere
Incorrect
Regions of atmosphere
-
Question 10 of 106
10. Question
Which of this layer has about 80% mass of the atmosphere?
Correct
Troposphere: The lowest layer of the atmosphere is called the troposphere and it extends from 0 – 10 km from the earth surface. About 80% of the mass of the atmosphere is in this layer.
Incorrect
Troposphere: The lowest layer of the atmosphere is called the troposphere and it extends from 0 – 10 km from the earth surface. About 80% of the mass of the atmosphere is in this layer.
-
Question 11 of 106
11. Question
Which of the following is not a category of troposphere?
Correct
This troposphere is further divided as Hydrosphere, Lithosphere and Biosphere.
Incorrect
This troposphere is further divided as Hydrosphere, Lithosphere and Biosphere.
-
Question 12 of 106
12. Question
Which of this living organism are included in the biosphere of the Earth?
Correct
Biosphere: It includes the lithosphere hydrosphere and atmosphere integrating the living organism present in the lithosphere, hydrosphere and atmosphere.
Incorrect
Biosphere: It includes the lithosphere hydrosphere and atmosphere integrating the living organism present in the lithosphere, hydrosphere and atmosphere.
-
Question 13 of 106
13. Question
- Assertion (A): The Earth is called as a blue planet as 75% of earth’s surface is covered by water.
- Reasoning(R): Hydrosphere only includes the fresh water sources of the Earth.
Correct
Hydrosphere: Hydrosphere includes all types of water sources like oceans, seas, rivers, lakes, streams, underground water, polar icecaps, clouds etc. It covers about 75% of the earth’s surface. Hence the earth is called as a blue planet.
Incorrect
Hydrosphere: Hydrosphere includes all types of water sources like oceans, seas, rivers, lakes, streams, underground water, polar icecaps, clouds etc. It covers about 75% of the earth’s surface. Hence the earth is called as a blue planet.
-
Question 14 of 106
14. Question
In ____ an explosion at the Union Carbide pesticide plant released a cloud of toxic gas _____ into the air.
Correct
The world’s worst chemical disaster happened in the Indian city of Bhopal in the early morning hours of December 3, 1984. An explosion at the Union Carbide pesticide plant released a cloud of toxic gas (methyl isocyanate) CH3NCO into the air.
Incorrect
The world’s worst chemical disaster happened in the Indian city of Bhopal in the early morning hours of December 3, 1984. An explosion at the Union Carbide pesticide plant released a cloud of toxic gas (methyl isocyanate) CH3NCO into the air.
-
Question 15 of 106
15. Question
Which of this pollution is also studied as atmospheric pollution?
Correct
Atmospheric pollution is generally studied as tropospheric pollution. Different types of atmospheric pollutions are Air pollution, Water pollution and Soil pollution.
Incorrect
Atmospheric pollution is generally studied as tropospheric pollution. Different types of atmospheric pollutions are Air pollution, Water pollution and Soil pollution.
-
Question 16 of 106
16. Question
Choose the incorrect statements.
- i) Air pollution is caused by any undesirable change in air which adversely affects the living organisms.
- ii) Air pollution is not limited to any of the regions of the atmosphere.
- iii) Air pollution is due to the excessive discharge of undesirable foreign matters in the atmosphere.
Correct
Air pollution: Any undesirable change in air which adversely affects living organisms is called air pollution. Air pollution is limited to troposphere and stratosphere. Air pollution is mainly due to the excessive discharge of undesirable foreign matter in to the atmospheric air.
Incorrect
Air pollution: Any undesirable change in air which adversely affects living organisms is called air pollution. Air pollution is limited to troposphere and stratosphere. Air pollution is mainly due to the excessive discharge of undesirable foreign matter in to the atmospheric air.
-
Question 17 of 106
17. Question
Which of the following is not a gaseous air pollutant?
Correct
Air pollutants may exist in two major forms namely, gases and particulates. Oxides of sulphur, oxides of nitrogen, oxides of carbon, and hydrocarbons are the gaseous air pollutants.
Incorrect
Air pollutants may exist in two major forms namely, gases and particulates. Oxides of sulphur, oxides of nitrogen, oxides of carbon, and hydrocarbons are the gaseous air pollutants.
-
Question 18 of 106
18. Question
What are the harmful effects of the sulphur dioxide?
Correct
Sulphur dioxide and sulphur trioxide are produced by burning sulphur containing fossil fuels and roasting Sulphide ores. Sulphur dioxide is a poisonous gas to both animals and plants. Sulphur dioxide causes eye irritation, coughing and respiratory diseases like asthma, bronchitis, etc.
Incorrect
Sulphur dioxide and sulphur trioxide are produced by burning sulphur containing fossil fuels and roasting Sulphide ores. Sulphur dioxide is a poisonous gas to both animals and plants. Sulphur dioxide causes eye irritation, coughing and respiratory diseases like asthma, bronchitis, etc.
-
Question 19 of 106
19. Question
- Assertion (A): Sulphur trioxide combines with water vapor and forms H2SO4 and comes down as Acid rain.
- Reasoning(R): Sulphur dioxide is oxidized into SO3 in the presence of particulate matter in the polluted air.
Correct
Sulphur dioxide is oxidized into more harmful sulphur trioxide in the presence of particulate matter present in polluted air .SO3 combines with atmospheric water vapor to form H2SO4 which comes down in the form of acid rain.
Incorrect
Sulphur dioxide is oxidized into more harmful sulphur trioxide in the presence of particulate matter present in polluted air .SO3 combines with atmospheric water vapor to form H2SO4 which comes down in the form of acid rain.
-
Question 20 of 106
20. Question
Which of the following is not true about the effects of nitrogen oxide?
Correct
The oxides of nitrogen are converted into nitric acid which comes down in the form of acid rain. They also form reddish brown haze in heavy traffic. Nitrogen dioxide potentially damages plant leaves and retards photosynthesis. NO2 is a respiratory irritant and it can cause asthma and lung injury. Nitrogen dioxide is also harmful to various textile fibres and metals.
Incorrect
The oxides of nitrogen are converted into nitric acid which comes down in the form of acid rain. They also form reddish brown haze in heavy traffic. Nitrogen dioxide potentially damages plant leaves and retards photosynthesis. NO2 is a respiratory irritant and it can cause asthma and lung injury. Nitrogen dioxide is also harmful to various textile fibres and metals.
-
Question 21 of 106
21. Question
Which of these produces the carbon monoxide?
Correct
Carbon monoxide is a poisonous gas produced as a result of incomplete combustion of coal or firewood. It is released into the air mainly by automobile exhaust.
Incorrect
Carbon monoxide is a poisonous gas produced as a result of incomplete combustion of coal or firewood. It is released into the air mainly by automobile exhaust.
-
Question 22 of 106
22. Question
Which of these are the effects of carbon monoxide in blood circulation?
Correct
Carbon monoxide binds with hemoglobin Unit and forms carboxy hemoglobin which impairs normal oxygen transport by blood and hence the oxygen carrying capacity of blood is reduced. This oxygen deficiency results in headache, dizziness, tension, Loss of consciousness, blurring of eye sight and cardiac arrest.
Incorrect
Carbon monoxide binds with hemoglobin Unit and forms carboxy hemoglobin which impairs normal oxygen transport by blood and hence the oxygen carrying capacity of blood is reduced. This oxygen deficiency results in headache, dizziness, tension, Loss of consciousness, blurring of eye sight and cardiac arrest.
-
Question 23 of 106
23. Question
Choose the Incorrect statements.
- i) Carbon dioxide is released into the atmosphere mainly by the process of respiration.
- ii) Green plants can convert CO2 gas in the atmosphere into carbohydrate and oxygen through a process called photosynthesis.
- iii) The decreased CO2 level in the atmosphere is responsible for global warming. It causes headache and nausea.
Correct
Carbon dioxide is released into the atmosphere mainly by the process of respiration, burning of fossil fuels, forest fire, decomposition of limestone in cement industry etc. Green plants can convert CO2 gas in the atmosphere into carbohydrate and oxygen through a process called photosynthesis. The increased CO2 level in the atmosphere is responsible for global warming. It causes headache and nausea.
Incorrect
Carbon dioxide is released into the atmosphere mainly by the process of respiration, burning of fossil fuels, forest fire, decomposition of limestone in cement industry etc. Green plants can convert CO2 gas in the atmosphere into carbohydrate and oxygen through a process called photosynthesis. The increased CO2 level in the atmosphere is responsible for global warming. It causes headache and nausea.
-
Question 24 of 106
24. Question
Choose the correct statements.
- i) Hydrocarbons are the compounds composed of carbon with any gas or metal compounds.
- ii) Hydrocarbons are the potential cancer causing agents.
Correct
The compounds composed of carbon and hydrogen only are called hydrocarbons. They are mainly produced naturally (marsh gas) and also by incomplete combustion of automobile fuel. They are potential cancer causing (carcinogenic) agents. For example, poly nuclear aromatic hydrocarbons (PAH) are carcinogenic they cause irritation in eyes and mucous membranes.
Incorrect
The compounds composed of carbon and hydrogen only are called hydrocarbons. They are mainly produced naturally (marsh gas) and also by incomplete combustion of automobile fuel. They are potential cancer causing (carcinogenic) agents. For example, poly nuclear aromatic hydrocarbons (PAH) are carcinogenic they cause irritation in eyes and mucous membranes.
-
Question 25 of 106
25. Question
Who coined the term the Greenhouse Effect?
Correct
In 1987, Jean Baptiste Fourier a French mathematician and scientist coined the term “Greenhouse Effect” for trapping of heat in the atmosphere by certain gases.
Incorrect
In 1987, Jean Baptiste Fourier a French mathematician and scientist coined the term “Greenhouse Effect” for trapping of heat in the atmosphere by certain gases.
-
Question 26 of 106
26. Question
Which of these used to trap the heat in the atmosphere?
- a) CFC
- b) CH4
- c) CO2
- d) All the above
Correct
The earth’s atmosphere allows most of the visible light from the Sun to pass through and reach Earth’s surface. As Earth’s surface is heated by sunlight, it radiates part of this energy back toward space as longer wavelengths (IR). Some of the heat is trapped by CH4, CO2, CFCs and water vapor present in the atmosphere. They absorb IR radiation and effectively block a large portion of earth’s emitted radiation. The radiation thus absorbed is partly reemitted to earth’s surface. Therefore, the earth’s surface gets heated up by a phenomenon called greenhouse effect.
Incorrect
The earth’s atmosphere allows most of the visible light from the Sun to pass through and reach Earth’s surface. As Earth’s surface is heated by sunlight, it radiates part of this energy back toward space as longer wavelengths (IR). Some of the heat is trapped by CH4, CO2, CFCs and water vapor present in the atmosphere. They absorb IR radiation and effectively block a large portion of earth’s emitted radiation. The radiation thus absorbed is partly reemitted to earth’s surface. Therefore, the earth’s surface gets heated up by a phenomenon called greenhouse effect.
-
Question 27 of 106
27. Question
- Assertion (A): Global warming is the process of heating up the earth through the greenhouse effect.
- Reasoning(R): The Carbon dioxide layer in the atmosphere reflects the infrared radiations and heat up the earth’s surface.
Correct
Thus Greenhouse effect may be defined as the heating up of the earth surface due to trapping of infrared radiations reflected by earth’s surface by CO2 layer in the atmosphere”. The heating up of earth through the greenhouse effect is called global warming.
Incorrect
Thus Greenhouse effect may be defined as the heating up of the earth surface due to trapping of infrared radiations reflected by earth’s surface by CO2 layer in the atmosphere”. The heating up of earth through the greenhouse effect is called global warming.
-
Question 28 of 106
28. Question
What will be the average surface temperature of the Earth without the greenhouse effect?
Correct
Without the heating caused by the greenhouse effect, Earth’s average surface temperature would be only about −18 °C (0 °F). Although the greenhouse effect is a naturally occurring phenomenon, it is intensified by the continuous emission of greenhouse gases into the atmosphere.
Incorrect
Without the heating caused by the greenhouse effect, Earth’s average surface temperature would be only about −18 °C (0 °F). Although the greenhouse effect is a naturally occurring phenomenon, it is intensified by the continuous emission of greenhouse gases into the atmosphere.
-
Question 29 of 106
29. Question
What is the pH value of the normal rain water?
Correct
Rain water normally has a pH of 5.6 due to dissolution of atmospheric CO2 into it.
Incorrect
Rain water normally has a pH of 5.6 due to dissolution of atmospheric CO2 into it.
-
Question 30 of 106
30. Question
Which of these drops the pH of the rain water?
Correct
Oxides of sulphur and nitrogen in the atmosphere may be absorbed by droplets of water that make up clouds and get chemically converted into Sulphuric acid and nitric acid respectively. As a result, pH of rain water drops below the level 5.6, hence it is called acid rain.
Incorrect
Oxides of sulphur and nitrogen in the atmosphere may be absorbed by droplets of water that make up clouds and get chemically converted into Sulphuric acid and nitric acid respectively. As a result, pH of rain water drops below the level 5.6, hence it is called acid rain.
-
Question 31 of 106
31. Question
Which of these react with the oxides of sulphur and nitrogen to produce acid rain?
Correct
Acid rain is a by-product of a variety of sulphur and nitrogen oxides in the atmosphere. Burning of fossil fuels (coal and oil) in power stations, furnaces and petrol, diesel in motor engines produce sulphur dioxide and nitrogen oxides. The main contributors of acid rain are SO2 and NO2. They are converted into Sulphuric acid and nitric acid respectively by the reaction with oxygen and water.
Incorrect
Acid rain is a by-product of a variety of sulphur and nitrogen oxides in the atmosphere. Burning of fossil fuels (coal and oil) in power stations, furnaces and petrol, diesel in motor engines produce sulphur dioxide and nitrogen oxides. The main contributors of acid rain are SO2 and NO2. They are converted into Sulphuric acid and nitric acid respectively by the reaction with oxygen and water.
-
Question 32 of 106
32. Question
Which of these is referred as stone leprosy?
Correct
Acid rain causes extensive damage to buildings and structural materials of marbles. This attack on marble is termed as Stone leprosy.
CaCO3 + H2SO4→ CaSO4 + H2O +CO2↑
Acid rain affects plants and animal life in aquatic ecosystem. It is harmful for agriculture, trees and plants as it dissolves and removes the nutrients needed for their growth. It corrodes water pipes resulting in the leaching of heavy metals such as iron, lead and copper into drinking water which has toxic effects. It causes respiratory ailment in humans and animals.
Incorrect
Acid rain causes extensive damage to buildings and structural materials of marbles. This attack on marble is termed as Stone leprosy.
CaCO3 + H2SO4→ CaSO4 + H2O +CO2↑
Acid rain affects plants and animal life in aquatic ecosystem. It is harmful for agriculture, trees and plants as it dissolves and removes the nutrients needed for their growth. It corrodes water pipes resulting in the leaching of heavy metals such as iron, lead and copper into drinking water which has toxic effects. It causes respiratory ailment in humans and animals.
-
Question 33 of 106
33. Question
Choose the correct statements.
- i) Particulate pollutants are large solid, gas and liquid particles.
- ii) Dust, smoke and aerosols are some of the particulate pollutants.
- iii) Most of the particulate pollutants are not hazardous.
Correct
Particulate pollutants are small solid particles and liquid droplets suspended in air. Many of particulate pollutants are hazardous. Examples: dust, pollen, smoke, soot and liquid droplets (aerosols) etc. Combustion of high ash fossil fuels creates fly ash and finishing of metals throws metallic particles into the atmosphere.
Incorrect
Particulate pollutants are small solid particles and liquid droplets suspended in air. Many of particulate pollutants are hazardous. Examples: dust, pollen, smoke, soot and liquid droplets (aerosols) etc. Combustion of high ash fossil fuels creates fly ash and finishing of metals throws metallic particles into the atmosphere.
-
Question 34 of 106
34. Question
In which of these ways the particulate pollutants are generated?
Correct
The dust, pollen, smoke, soot and liquid droplets (aerosols) etc. are some examples of particulate pollutants. They are blown into the atmosphere by volcanic eruption, blowing of dust; incomplete combustion of fossil fuels induces soot.
Incorrect
The dust, pollen, smoke, soot and liquid droplets (aerosols) etc. are some examples of particulate pollutants. They are blown into the atmosphere by volcanic eruption, blowing of dust; incomplete combustion of fossil fuels induces soot.
-
Question 35 of 106
35. Question
Which of these are not viable particulates?
Correct
Viable particulates: The viable particulates are the small size living organisms such as bacteria, fungi, moulds, algae, etc. which are dispersed in air. Some of the fungi cause allergy in human beings and diseases in plants.
Incorrect
Viable particulates: The viable particulates are the small size living organisms such as bacteria, fungi, moulds, algae, etc. which are dispersed in air. Some of the fungi cause allergy in human beings and diseases in plants.
-
Question 36 of 106
36. Question
What are the functions of the non-viable particles?
Correct
Non-viable particulates: The non- viable particulates are small solid particles and liquid droplets suspended in air. They help in the transportation of viable particles.
Incorrect
Non-viable particulates: The non- viable particulates are small solid particles and liquid droplets suspended in air. They help in the transportation of viable particles.
-
Question 37 of 106
37. Question
How many types of nonviable particulates are classified?
Correct
There are four types of nonviable particulates in the atmosphere. They are classified according to their nature and size.
Incorrect
There are four types of nonviable particulates in the atmosphere. They are classified according to their nature and size.
-
Question 38 of 106
38. Question
Which of this combustion produce the particles or mixtures?
Correct
The Particles (or) mixture of solid and liquid particles are formed by combustion of organic matter. For example, cigarette smoke, oil smoke, smokes from burning of fossil fuel , garbage and dry leaves.
Incorrect
The Particles (or) mixture of solid and liquid particles are formed by combustion of organic matter. For example, cigarette smoke, oil smoke, smokes from burning of fossil fuel , garbage and dry leaves.
-
Question 39 of 106
39. Question
Which of the following is not a dust form?
Correct
Dust: Dust composed of fine solid particles produced during crushing and grinding of solid materials. For example, sand from sand blasting, saw dust from wood works, cement dust from cement factories and fly ash from power generating units.
Incorrect
Dust: Dust composed of fine solid particles produced during crushing and grinding of solid materials. For example, sand from sand blasting, saw dust from wood works, cement dust from cement factories and fly ash from power generating units.
-
Question 40 of 106
40. Question
Which of these forms create the mists?
Correct
Mists: They are formed by particles of spray liquids and condensation of vapors in air. For example, Sulphuric acid mist, herbicides and insecticides sprays can form mists.
Incorrect
Mists: They are formed by particles of spray liquids and condensation of vapors in air. For example, Sulphuric acid mist, herbicides and insecticides sprays can form mists.
-
Question 41 of 106
41. Question
Which of this condensation of vapors creates fumes?
Correct
Fumes: Fumes are obtained by condensation of vapors released during sublimation, distillation, boiling and calcination and by several other chemical reactions. For example, organic solvents, metals and metallic oxides form fume particles.
Incorrect
Fumes: Fumes are obtained by condensation of vapors released during sublimation, distillation, boiling and calcination and by several other chemical reactions. For example, organic solvents, metals and metallic oxides form fume particles.
-
Question 42 of 106
42. Question
Which pollutants are responsible causes of pneumoconiosis?
Correct
Dust, mist, fumes, etc., are air borne particles which are dangerous for human health. Particulate pollutants bigger than 5 microns are likely to settle in the nasal passage whereas particles of about 10 micron enter the lungs easily and cause scaring or fibrosis of lung lining. They irritate the lungs and causes cancer and asthma. This disease is also called pneumoconiosis. Coal miners may suffer from black lung disease. Textile workers may suffer from white lung disease.
Incorrect
Dust, mist, fumes, etc., are air borne particles which are dangerous for human health. Particulate pollutants bigger than 5 microns are likely to settle in the nasal passage whereas particles of about 10 micron enter the lungs easily and cause scaring or fibrosis of lung lining. They irritate the lungs and causes cancer and asthma. This disease is also called pneumoconiosis. Coal miners may suffer from black lung disease. Textile workers may suffer from white lung disease.
-
Question 43 of 106
43. Question
Which of this process removes the particulates from the air?
Correct
The particulates from air can be removed by using electrostatic precipitators, gravity settling chambers, and wet scrubbers or by cyclone collectors. These techniques are based on washing away or settling of the particulates.
Incorrect
The particulates from air can be removed by using electrostatic precipitators, gravity settling chambers, and wet scrubbers or by cyclone collectors. These techniques are based on washing away or settling of the particulates.
-
Question 44 of 106
44. Question
What is the main component of smog?
Correct
Smog is a combination of smoke and fog which forms droplets that remain suspended in the air. Smog is a chemical mixture of gases that forms a brownish yellow haze over urban cities. Smog mainly consists of ground level ozone, oxides of nitrogen, volatile organic compounds, SO2, acidic aerosols and gases, and particulate matter.
Incorrect
Smog is a combination of smoke and fog which forms droplets that remain suspended in the air. Smog is a chemical mixture of gases that forms a brownish yellow haze over urban cities. Smog mainly consists of ground level ozone, oxides of nitrogen, volatile organic compounds, SO2, acidic aerosols and gases, and particulate matter.
-
Question 45 of 106
45. Question
Which of these causes the classical smog?
Correct
There are two types of smog. One is Classical smog caused by coal smoke and fog second one is photo chemical smog caused by photo chemical oxidants.
Incorrect
There are two types of smog. One is Classical smog caused by coal smoke and fog second one is photo chemical smog caused by photo chemical oxidants.
-
Question 46 of 106
46. Question
In which year the London smog was first observed?
Correct
Classical smog or London smog: Classical smog was first observed in London in December 1952 and hence it is also known as London Smog.
Incorrect
Classical smog or London smog: Classical smog was first observed in London in December 1952 and hence it is also known as London Smog.
-
Question 47 of 106
47. Question
. Which of the following is not true regarding the London smog?
Correct
London smog consists of coal smoke and fog. It occurs in cool humid climate. This atmospheric smog found in many large cities. The chemical composition is the mixture of SO2, SO3 and humidity. It generally occurs in the morning and becomes worse when the sun rises. This is mainly due to the induced oxidation of SO2 to SO3, which reacts with water yielding sulphuric acid aerosol. Chemically it is reducing in nature because of high concentration of SO2 and so it is also called as reducing smog.
Incorrect
London smog consists of coal smoke and fog. It occurs in cool humid climate. This atmospheric smog found in many large cities. The chemical composition is the mixture of SO2, SO3 and humidity. It generally occurs in the morning and becomes worse when the sun rises. This is mainly due to the induced oxidation of SO2 to SO3, which reacts with water yielding sulphuric acid aerosol. Chemically it is reducing in nature because of high concentration of SO2 and so it is also called as reducing smog.
-
Question 48 of 106
48. Question
What are the effects of classical smog?
Correct
Explanation
Effects of classical smog: Smog is primarily responsible for acid rain. Smog results in poor visibility and it affects air and road transport. It also causes bronchial irritation.
Incorrect
Explanation
Effects of classical smog: Smog is primarily responsible for acid rain. Smog results in poor visibility and it affects air and road transport. It also causes bronchial irritation.
-
Question 49 of 106
49. Question
Which type of smog is formed with the presence of sunlight?
Correct
Photo chemical smog or Los Angel Smog: Photo Chemical smog was first observed in Los Angeles in 1950. It occurs in warm, dry and sunny climate. This type of smog is formed by the combination of smoke, dust and fog with air pollutants like oxides of nitrogen and hydrocarbons in the presence of sunlight. It forms when the sun shines and becomes worse in the afternoon.
Incorrect
Photo chemical smog or Los Angel Smog: Photo Chemical smog was first observed in Los Angeles in 1950. It occurs in warm, dry and sunny climate. This type of smog is formed by the combination of smoke, dust and fog with air pollutants like oxides of nitrogen and hydrocarbons in the presence of sunlight. It forms when the sun shines and becomes worse in the afternoon.
-
Question 50 of 106
50. Question
Which of these results in the high oxidizing nature of the photo chemical smog?
- a) NO4 and O
- b) NO and O
- c) NO2 and O3
- d) NO and O2
Correct
Chemically the photo chemical smog is oxidizing in nature because of high concentration of oxidizing agents NO2 and O3, so it is also called as oxidizing smog.
Incorrect
Chemically the photo chemical smog is oxidizing in nature because of high concentration of oxidizing agents NO2 and O3, so it is also called as oxidizing smog.
-
Question 51 of 106
51. Question
Which of these results in the reaction of un-burnt hydrocarbons with strong oxidizing agents?
Correct
NO and O3 are strong oxidizing agent and can react with un burnt hydrocarbons in polluted air to form formaldehyde, Acrolein and peroxy acetyl nitrate (PAN).
Incorrect
NO and O3 are strong oxidizing agent and can react with un burnt hydrocarbons in polluted air to form formaldehyde, Acrolein and peroxy acetyl nitrate (PAN).
-
Question 52 of 106
52. Question
What are the main components of Los Angeles smog?
Correct
The three main components of photo chemical smog are nitrogen oxide, ozone and oxidized hydro carbon like formaldehyde(HCHO), Acrolein (CH2=CH-CHO),peroxy acetyl nitrate (PAN).
Incorrect
The three main components of photo chemical smog are nitrogen oxide, ozone and oxidized hydro carbon like formaldehyde(HCHO), Acrolein (CH2=CH-CHO),peroxy acetyl nitrate (PAN).
-
Question 53 of 106
53. Question
Which of the following is not an direct effect of the photo chemical smog?
Correct
Photochemical smog causes irritation to eyes, skin and lungs, increase in chances of asthma. High concentrations of ozone and NO can cause nose and throat irritation, chest pain, uncomfortable in breathing etc. PAN is toxic to plants, attacks younger leaves and cause bronzing and glazing of their surfaces. It causes corrosion of metals stones, building materials and painted surfaces.
Incorrect
Photochemical smog causes irritation to eyes, skin and lungs, increase in chances of asthma. High concentrations of ozone and NO can cause nose and throat irritation, chest pain, uncomfortable in breathing etc. PAN is toxic to plants, attacks younger leaves and cause bronzing and glazing of their surfaces. It causes corrosion of metals stones, building materials and painted surfaces.
-
Question 54 of 106
54. Question
Which of this suppression will reduce the formation of photochemical smog?
Correct
The formation of photochemical smog can be suppressed by preventing the release of nitrogen oxides and hydrocarbons into the atmosphere from the motor vehicles by using catalytic convertors in engines.
Incorrect
The formation of photochemical smog can be suppressed by preventing the release of nitrogen oxides and hydrocarbons into the atmosphere from the motor vehicles by using catalytic convertors in engines.
-
Question 55 of 106
55. Question
Which of these trees are used to metabolize the effects of nitrogen oxides?
Correct
Plantation of certain trees like Pinus, Pyrus, Querus Vitus and juniparus can metabolize nitrogen oxide.
Incorrect
Plantation of certain trees like Pinus, Pyrus, Querus Vitus and juniparus can metabolize nitrogen oxide.
-
Question 56 of 106
56. Question
Which of these layers acts as a shield for UV radiations at high altitudes??
- a) CO2
- b) O3
- c) NO
- d) O2
Correct
At high altitudes to the atmosphere consists of a layer of ozone (O3) which acts as an umbrella or shield for harmful UV radiations. It protects us from harmful effect such as skin cancer. UV radiation can convert molecular oxygen into ozone.
Incorrect
At high altitudes to the atmosphere consists of a layer of ozone (O3) which acts as an umbrella or shield for harmful UV radiations. It protects us from harmful effect such as skin cancer. UV radiation can convert molecular oxygen into ozone.
-
Question 57 of 106
57. Question
Which gas is thermodynamically unstable and decomposes into molecular oxygen?
Correct
Ozone gas is thermodynamically unstable and readily decomposes to molecular oxygen.
Incorrect
Ozone gas is thermodynamically unstable and readily decomposes to molecular oxygen.
-
Question 58 of 106
58. Question
Which gases are most responsible for the depletion of the ozone layer?
Correct
In recent years, a gradual depletion of this protective ozone layer has been reported. Nitric oxide and CFC are found to be most responsible for depletion of ozone layer. Generally substances that cause depletion of ozone or make it thinner are called Ozone Depletion Substances abbreviated as ODS. The loss of ozone molecules in the upper atmosphere is termed as depletion of stratospheric ozone.
Incorrect
In recent years, a gradual depletion of this protective ozone layer has been reported. Nitric oxide and CFC are found to be most responsible for depletion of ozone layer. Generally substances that cause depletion of ozone or make it thinner are called Ozone Depletion Substances abbreviated as ODS. The loss of ozone molecules in the upper atmosphere is termed as depletion of stratospheric ozone.
-
Question 59 of 106
59. Question
In which of these forms nitrogen oxides are introduced into the stratosphere?
Correct
Nitrogen oxides introduced directly into the stratosphere by the supersonic jet aircraft engines in the form of exhaust gases. These oxides are also released by combustion of fossil fuels and nitrogen fertilizers. Inert nitrous oxide in the stratosphere is photo chemically converted into more reactive nitric oxide. Oxides of nitrogen catalyze the decomposition of ozone and are themselves regenerated.
Incorrect
Nitrogen oxides introduced directly into the stratosphere by the supersonic jet aircraft engines in the form of exhaust gases. These oxides are also released by combustion of fossil fuels and nitrogen fertilizers. Inert nitrous oxide in the stratosphere is photo chemically converted into more reactive nitric oxide. Oxides of nitrogen catalyze the decomposition of ozone and are themselves regenerated.
-
Question 60 of 106
60. Question
What is the trade name of Chloro fluoro derivatives?
Correct
The Chloro fluoro derivatives of methane and ethane are referred by trade name Freons.
Incorrect
The Chloro fluoro derivatives of methane and ethane are referred by trade name Freons.
-
Question 61 of 106
61. Question
Which of the following is not a property of the Chloro fluoro carbon compounds?
Correct
The Chloro Fluoro Carbon compounds are stable, non-toxic, noncorrosive and non-inflammable, easily liquefiable and are used in refrigerators, air- conditioners and in the production of plastic foams.
Incorrect
The Chloro Fluoro Carbon compounds are stable, non-toxic, noncorrosive and non-inflammable, easily liquefiable and are used in refrigerators, air- conditioners and in the production of plastic foams.
-
Question 62 of 106
62. Question
The CFC breaks up into ______ free radical in the presence of ______.
Correct
In the presence of UV radiation, CFC’s break up into chlorine free radical Chlorine radical is regenerated in the course of reaction. Due to this continuous attack of Cl˚ thinning of ozone layer takes place which leads to formation of ozone hole. It is estimated that for every reactive chlorine atom generated in the stratosphere 1, 00, 000 molecules of ozone are depleted.
Incorrect
In the presence of UV radiation, CFC’s break up into chlorine free radical Chlorine radical is regenerated in the course of reaction. Due to this continuous attack of Cl˚ thinning of ozone layer takes place which leads to formation of ozone hole. It is estimated that for every reactive chlorine atom generated in the stratosphere 1, 00, 000 molecules of ozone are depleted.
-
Question 63 of 106
63. Question
- . Assertion (A): Any change in the equilibrium level of the ozone will adversely affect life in the biosphere
- Reasoning(R): The regular natural process of formation and destruction of ozone never disturbs the equilibrium level of ozone in the stratosphere.
Correct
The formation and destruction of ozone is a regular natural process, which never disturbs the equilibrium level of ozone in the stratosphere. Any change in the equilibrium level of the ozone in the atmosphere will adversely affect life in the biosphere.
Incorrect
The formation and destruction of ozone is a regular natural process, which never disturbs the equilibrium level of ozone in the stratosphere. Any change in the equilibrium level of the ozone in the atmosphere will adversely affect life in the biosphere.
-
Question 64 of 106
64. Question
What are the negative impacts of ozone layer depletion?
Correct
Depletion of ozone layer will allow more UV rays to reach the earth surface and layer would cause skin cancer and also decrease the immunity level in human beings. UV radiation affects plant proteins which lead to harmful mutation of cells. UV radiation affects the growth of phytoplankton; as a result ocean food chain is disturbed and even damages the fish productivity.
Incorrect
Depletion of ozone layer will allow more UV rays to reach the earth surface and layer would cause skin cancer and also decrease the immunity level in human beings. UV radiation affects plant proteins which lead to harmful mutation of cells. UV radiation affects the growth of phytoplankton; as a result ocean food chain is disturbed and even damages the fish productivity.
-
Question 65 of 106
65. Question
Which of the natural element is essential for life?
Correct
Water is essential for life. Without water life would have been impossible. The slogan, ‘Save Water, Water will save you’ tell us the importance of water. Such slogans tell us to save water. Apart from saving water, maintaining its quality is also equally important.
Incorrect
Water is essential for life. Without water life would have been impossible. The slogan, ‘Save Water, Water will save you’ tell us the importance of water. Such slogans tell us to save water. Apart from saving water, maintaining its quality is also equally important.
-
Question 66 of 106
66. Question
Which of the following pollutant originates from both natural and human activities?
Correct
The water pollutants originate from both natural and human activities. The source of water pollution is classified as Point and Non-point source.
Incorrect
The water pollutants originate from both natural and human activities. The source of water pollution is classified as Point and Non-point source.
-
Question 67 of 106
67. Question
- Assertion (A): Easily identified source of pollution is called as point source.
- Reasoning(R): Non-point sources of water pollution are mining wastes, acid rain, agricultural runoff and construction sediments.
Correct
Easily identified source of place of pollution is called as point source. Example: municipal and industrial discharge pipes. Non-point source cannot be identified easily, example: agricultural runoff, mining wastes, acid rain, and storm-water drainage and construction sediments.
Incorrect
Easily identified source of place of pollution is called as point source. Example: municipal and industrial discharge pipes. Non-point source cannot be identified easily, example: agricultural runoff, mining wastes, acid rain, and storm-water drainage and construction sediments.
-
Question 68 of 106
68. Question
Match the pollutant and their sources.
- Microorganisms i) Mining of uranium materials
- Radioactive substances ii) Chemical fertilizers
- Heat iii) Domestic sewage
- Plant nutrients iv) Cooling purpose in Industries
Correct
List of major water pollutants and their sources
Incorrect
List of major water pollutants and their sources
-
Question 69 of 106
69. Question
Which of these microorganisms causes the microbiological diseases?
Correct
Microbiological (Pathogens) Disease causing microorganisms like bacteria, viruses and protozoa are most serious water pollutants. They come from domestic sewage and animal excreta. Fish and shellfish can become contaminated and people who eat them can become ill. Some serious diseases like polio and cholera are water borne diseases. Human excreta contain bacteria such as Escherichia coli and Streptococcus faecalis which cause gastrointestinal diseases.
Incorrect
Microbiological (Pathogens) Disease causing microorganisms like bacteria, viruses and protozoa are most serious water pollutants. They come from domestic sewage and animal excreta. Fish and shellfish can become contaminated and people who eat them can become ill. Some serious diseases like polio and cholera are water borne diseases. Human excreta contain bacteria such as Escherichia coli and Streptococcus faecalis which cause gastrointestinal diseases.
-
Question 70 of 106
70. Question
Which of these organic excessive growth also causes the water pollution?.
Correct
Organic matter such as leaves, grass, trash etc can also pollute water. Water pollution is caused by excessive phytoplankton growth within water. Microorganisms present in water decompose this organic matter and consume dissolved oxygen in water.
Incorrect
Organic matter such as leaves, grass, trash etc can also pollute water. Water pollution is caused by excessive phytoplankton growth within water. Microorganisms present in water decompose this organic matter and consume dissolved oxygen in water.
-
Question 71 of 106
71. Question
Which of this process provides excess nutrients to the water bodies?
Correct
Eutrophication is a process by which water bodies receive excess nutrients that stimulates excessive plant growth (algae other plant weeds). This enhanced plant growth in water bodies is called as algae bloom. The growth of algae in extreme abundance covers the water surface and reduces the oxygen concentration in water. Thus, bloom-infested water inhibits the growth of other living organisms in the water body. This process in which the nutrient rich water bodies support a dense plant population kills animal life by depriving it of oxygen and results in loss of biodiversity is known as eutrophication.
Incorrect
Eutrophication is a process by which water bodies receive excess nutrients that stimulates excessive plant growth (algae other plant weeds). This enhanced plant growth in water bodies is called as algae bloom. The growth of algae in extreme abundance covers the water surface and reduces the oxygen concentration in water. Thus, bloom-infested water inhibits the growth of other living organisms in the water body. This process in which the nutrient rich water bodies support a dense plant population kills animal life by depriving it of oxygen and results in loss of biodiversity is known as eutrophication.
-
Question 72 of 106
72. Question
Choose the Incorrect statement about the BOD of drinking water.
- i) The total amount of oxygen in milligrams consumed by microorganism in decomposing the waste for 5 days is called as BOD.
- ii) The water for calculating BOD is at 20°C and the value is expressed in ppm.
- iii) The BOD value of the clean water will be above 17 ppm whereas the contaminated water is below 5 ppm.
Correct
The total amount of oxygen in milligrams consumed by microorganisms in decomposing the waste in one liters of water at 20°C for a period of 5 days is called biochemical oxygen demand (BOD) and its value is expressed in ppm. BOD is used as a measure of degree of water pollution. Clean water would have BOD value less than 5 ppm whereas highly polluted water has BOD value of 17 ppm or more.
Incorrect
The total amount of oxygen in milligrams consumed by microorganisms in decomposing the waste in one liters of water at 20°C for a period of 5 days is called biochemical oxygen demand (BOD) and its value is expressed in ppm. BOD is used as a measure of degree of water pollution. Clean water would have BOD value less than 5 ppm whereas highly polluted water has BOD value of 17 ppm or more.
-
Question 73 of 106
73. Question
Which of the following is used as an oxidizing agent in COD?
- a) MN2SO4
- b) K2Cr2O7
- c) H2SO4
- d) HCL
Correct
BOD measurement takes 5 days so another parameter called the Chemical Oxygen Demand (COD) is measured. Chemical oxygen demand (COD) is defined as the amount of oxygen required by the organic matter in a sample of water for its oxidation by a strong oxidizing agent like K2Cr2O7 in acid medium for a period of 2 hrs.
Incorrect
BOD measurement takes 5 days so another parameter called the Chemical Oxygen Demand (COD) is measured. Chemical oxygen demand (COD) is defined as the amount of oxygen required by the organic matter in a sample of water for its oxidation by a strong oxidizing agent like K2Cr2O7 in acid medium for a period of 2 hrs.
-
Question 74 of 106
74. Question
Which of this metal pollutant of drinking water causes kidney damage to humans?
Correct
Harmful effects of chemical water pollutants: Cadmium and mercury can cause kidney damage. Lead poisoning can leads to the severe damage of kidneys, liver, brain etc. it also affects central nervous system. Polychlorinated biphenyls (PCBs) causes skin diseases and are carcinogenic in nature.
Incorrect
Harmful effects of chemical water pollutants: Cadmium and mercury can cause kidney damage. Lead poisoning can leads to the severe damage of kidneys, liver, brain etc. it also affects central nervous system. Polychlorinated biphenyls (PCBs) causes skin diseases and are carcinogenic in nature.
-
Question 75 of 106
75. Question
In which year the standard characteristics for the drinking water were prescribed by BIS?
Correct
Nowadays most of us hesitate to use natural water directly for drinking, because biological, physical or chemical impurities from different sources mix with surface water or ground water. Institutions like WHO (World Health Organization) at world level and BIS (Bureau of Indian Standards) and ICMR (ICMR: Indian Council of Medical Research) at national level have prescribed standards for quality of drinking water. Standard characteristics prescribed for deciding the quality of drinking water by BIS, in 1991
Incorrect
Nowadays most of us hesitate to use natural water directly for drinking, because biological, physical or chemical impurities from different sources mix with surface water or ground water. Institutions like WHO (World Health Organization) at world level and BIS (Bureau of Indian Standards) and ICMR (ICMR: Indian Council of Medical Research) at national level have prescribed standards for quality of drinking water. Standard characteristics prescribed for deciding the quality of drinking water by BIS, in 1991
-
Question 76 of 106
76. Question
What is the desirable pH limit of drinking water?
Correct
Incorrect
-
Question 77 of 106
77. Question
Which of the following is a biological characteristic of the drinking water?
Correct
Standard characteristics of drinking water
Incorrect
Standard characteristics of drinking water
-
Question 78 of 106
78. Question
Which of the following statement is not true regarding the fluorides?
Correct
Fluoride ion deficiency in drinking water causes tooth decay. Water soluble fluorides are added to increase the fluoride ion concentration up to 1 ppm. The Fluoride ions make the enamel on teeth much harder by converting hydroxyapatite, [3(Ca3(PO4)2.Ca(OH)2], the enamel on the surface of the teeth, into much harder fluorapatite, [3(Ca3(PO4)2.CaF2]. However, Fluoride ion concentration above 2 ppm causes brown mottling of teeth. Excess fluoride causes damage to bone and teeth.
Incorrect
Fluoride ion deficiency in drinking water causes tooth decay. Water soluble fluorides are added to increase the fluoride ion concentration up to 1 ppm. The Fluoride ions make the enamel on teeth much harder by converting hydroxyapatite, [3(Ca3(PO4)2.Ca(OH)2], the enamel on the surface of the teeth, into much harder fluorapatite, [3(Ca3(PO4)2.CaF2]. However, Fluoride ion concentration above 2 ppm causes brown mottling of teeth. Excess fluoride causes damage to bone and teeth.
-
Question 79 of 106
79. Question
Which of these human organs are affected by lead contamination above 50 ppb in drinking water?
Correct
Drinking water containing lead contamination above 50ppb can cause damage to liver, kidney and reproductive systems
Incorrect
Drinking water containing lead contamination above 50ppb can cause damage to liver, kidney and reproductive systems
-
Question 80 of 106
80. Question
What are the effects of excessive concentration of sulphate level in drinking water?
Correct
Sulphate: Moderate level of sulphate is harmless. The excessive concentration (>500ppm) of sulphates in drinking water causes laxative effect.
Incorrect
Sulphate: Moderate level of sulphate is harmless. The excessive concentration (>500ppm) of sulphates in drinking water causes laxative effect.
-
Question 81 of 106
81. Question
Which of this ppm value of a drinking water will cause blue baby syndrome in children?
Correct
Nitrate: Use of drinking water having concentration of nitrate higher than 45 ppm may causes methemoglobinemia (blue baby syndrome) disease in children.
Incorrect
Nitrate: Use of drinking water having concentration of nitrate higher than 45 ppm may causes methemoglobinemia (blue baby syndrome) disease in children.
-
Question 82 of 106
82. Question
Which of the following facts about the soil is not true?
Correct
Soil is a thin layer of organic and inorganic material that covers the earth’s rocky surface. Soil constitutes the upper crust of the earth, which supports land, plants and animals. Soil pollution is defined as the buildup of persistent toxic compounds, radioactive materials, chemical salts and disease causing agents in soils which have harmful effects on plant growth and animal health. Soil pollution affects the structure and fertility of soil, groundwater quality and food chain in biological ecosystem.
Incorrect
Soil is a thin layer of organic and inorganic material that covers the earth’s rocky surface. Soil constitutes the upper crust of the earth, which supports land, plants and animals. Soil pollution is defined as the buildup of persistent toxic compounds, radioactive materials, chemical salts and disease causing agents in soils which have harmful effects on plant growth and animal health. Soil pollution affects the structure and fertility of soil, groundwater quality and food chain in biological ecosystem.
-
Question 83 of 106
83. Question
Choose the Incorrect statements.
- i) Most of the salts are soluble in water and includes cations like calcium, magnesium, sodium, potassium and iron.
- ii) The anions included in water are carbonate, bicarbonate, chloride, sulphate, phosphate and nitrate.
- iii) The Total dissolved solids concentration lower than 500 ppm in a drinking water causes irritation in stomach and intestine.
Correct
Total dissolved solids (TDS): Most of the salts are soluble in water. It includes cations like calcium, magnesium, sodium, potassium, iron and anions like carbonate, bicarbonate, chloride, sulphate, phosphate and nitrate. Use of drinking water having total dissolved solids concentration higher than 500 ppm causes possibilities of irritation in stomach and intestine.
Incorrect
Total dissolved solids (TDS): Most of the salts are soluble in water. It includes cations like calcium, magnesium, sodium, potassium, iron and anions like carbonate, bicarbonate, chloride, sulphate, phosphate and nitrate. Use of drinking water having total dissolved solids concentration higher than 500 ppm causes possibilities of irritation in stomach and intestine.
-
Question 84 of 106
84. Question
Choose the correct statements.
- i) Plants obtain carbon, hydrogen and oxygen from air and water.
- ii) Plants absorb the essential nutrients from the artificial fertilizers.
- iii) The usage of phosphate fertilizers and NPK increase the yield of the soil.
Correct
Sources of soil pollution: Artificial fertilizers: Soil nutrients are useful for growth of plants. Plants obtains carbon, hydrogen and oxygen from air or water, whereas other essential nutrients like nitrogen, phosphorous, potassium, calcium, magnesium, sulphur are being absorbed from soil. To remove the deficiency of nutrients in soil, farmers add artificial fertilizers. Increased use of phosphate fertilizers or excess use of artificial fertilizers like NPK in soil, results in reduced yield in that soil.
Incorrect
Sources of soil pollution: Artificial fertilizers: Soil nutrients are useful for growth of plants. Plants obtains carbon, hydrogen and oxygen from air or water, whereas other essential nutrients like nitrogen, phosphorous, potassium, calcium, magnesium, sulphur are being absorbed from soil. To remove the deficiency of nutrients in soil, farmers add artificial fertilizers. Increased use of phosphate fertilizers or excess use of artificial fertilizers like NPK in soil, results in reduced yield in that soil.
-
Question 85 of 106
85. Question
- Assertion (A): Pesticides are the chemicals used to kill or stop the growth of unwanted organisms.
- Reasoning(R): Pesticides does not affect the human beings and animals.
Correct
Pesticides are the chemicals that are used to kill or stop the growth of unwanted organisms. But these pesticides can affect the health of human beings.
Incorrect
Pesticides are the chemicals that are used to kill or stop the growth of unwanted organisms. But these pesticides can affect the health of human beings.
-
Question 86 of 106
86. Question
Which of the following is not an insecticide?
Correct
Insecticides: Insecticides like DDT, BHC, Aldrin etc. can stay in soil for long period of time and are absorbed by soil. They contaminate root crops like carrot, radish, etc.
Incorrect
Insecticides: Insecticides like DDT, BHC, Aldrin etc. can stay in soil for long period of time and are absorbed by soil. They contaminate root crops like carrot, radish, etc.
-
Question 87 of 106
87. Question
Which of these compounds are generally used as a fungicide?
Correct
Fungicide: Organic mercury compounds are used as most common fungicide. They dissociate in soil to produce mercury which is highly toxic.
Incorrect
Fungicide: Organic mercury compounds are used as most common fungicide. They dissociate in soil to produce mercury which is highly toxic.
-
Question 88 of 106
88. Question
Choose the incorrect statements.
- i) Herbicides are used to control unwanted plants known as weed killers.
- ii) Sodium chlorate and Sodium arsenate are known herbicides.
- iii) Herbicides are not toxic to animals and mammals.
Correct
Herbicides: Herbicides are the chemical compounds used to control unwanted plants. They are otherwise known as weed killers. Example: sodium chlorate (NaClO3) and sodium arsenate (Na3AsO3). Most of the herbicides are toxic to mammals.
Incorrect
Herbicides: Herbicides are the chemical compounds used to control unwanted plants. They are otherwise known as weed killers. Example: sodium chlorate (NaClO3) and sodium arsenate (Na3AsO3). Most of the herbicides are toxic to mammals.
-
Question 89 of 106
89. Question
Which of these human activities causes the major soil pollution?
Correct
Industrial activities have been the biggest contributor to the soil pollution especially the mining and manufacturing activities.
Incorrect
Industrial activities have been the biggest contributor to the soil pollution especially the mining and manufacturing activities.
-
Question 90 of 106
90. Question
Which of these chemicals are not involved in the industrial toxic wastes?
Correct
Large number of toxic wastes is released from industries. Industrial wastes include cyanides, chromates, acids, alkalis, and metals like mercury, copper, zinc, cadmium and lead etc. These industrial wastes in the soil surface lie for a long time and make it unsuitable for use.
Incorrect
Large number of toxic wastes is released from industries. Industrial wastes include cyanides, chromates, acids, alkalis, and metals like mercury, copper, zinc, cadmium and lead etc. These industrial wastes in the soil surface lie for a long time and make it unsuitable for use.
-
Question 91 of 106
91. Question
Which of these are the waste management techniques?
Correct
Waste management: Environmental pollution can be controlled by proper disposal of wastes. Recycling: a large amount of disposed waste material can be reused by recycling the waste, thus it reduces the land fill and converts waste into useful forms. Substitution of less toxic solvents for highly toxic ones used in certain industrial processes. Use of fuels with lower sulphur content (e.g., washed coal) Growing more trees. Control measures in vehicle emissions are adequate.
Incorrect
Waste management: Environmental pollution can be controlled by proper disposal of wastes. Recycling: a large amount of disposed waste material can be reused by recycling the waste, thus it reduces the land fill and converts waste into useful forms. Substitution of less toxic solvents for highly toxic ones used in certain industrial processes. Use of fuels with lower sulphur content (e.g., washed coal) Growing more trees. Control measures in vehicle emissions are adequate.
-
Question 92 of 106
92. Question
What is the primary focus of Green chemistry?
Correct
Green chemistry is a chemical philosophy encouraging the design of products and processes that reduce or eliminate the use and generation of hazardous substances. For this, scientists are trying to develop methods to produce eco-friendly compounds.
Incorrect
Green chemistry is a chemical philosophy encouraging the design of products and processes that reduce or eliminate the use and generation of hazardous substances. For this, scientists are trying to develop methods to produce eco-friendly compounds.
-
Question 93 of 106
93. Question
Which of these are used to dehydrogenation of ethyl benzene?
- a) Fe2O3
- b) MnSo4
- c) CH6
- d) CH3COOH
Correct
Traditional route: This method involves two steps. Carcinogenic benzene reacts with ethylene to form ethyl benzene. Then ethyl benzene on dehydrogenation using Fe2O3/ Al2O3 gives styrene. Greener route: To avoid carcinogenic benzene, greener route is to start with cheaper and environmentally safer xylenes.
Incorrect
Traditional route: This method involves two steps. Carcinogenic benzene reacts with ethylene to form ethyl benzene. Then ethyl benzene on dehydrogenation using Fe2O3/ Al2O3 gives styrene. Greener route: To avoid carcinogenic benzene, greener route is to start with cheaper and environmentally safer xylenes.
-
Question 94 of 106
94. Question
Choose the incorrect statements.
- i) Tetrachloroethylene used in dry cleaning of clothes pollutes the ground water.
- ii) Liquefied CO2 with suitable detergent is not harmful to the ground water.
- iii) HO2 is used for bleaching clothes for better results and utilizes less water.
Correct
Dry cleaning of clothes: Solvents like tetrachloroethylene used in dry cleaning of clothes, pollute the ground water and are carcinogenic. In the place of tetrachloroethylene, liquefied CO2 with suitable detergent is an alternate solvent used. Liquefied CO2 is not harmful to the ground water. Now days H2O2 used for bleaching clothes in laundry, gives better results and utilizes less water.
Incorrect
Dry cleaning of clothes: Solvents like tetrachloroethylene used in dry cleaning of clothes, pollute the ground water and are carcinogenic. In the place of tetrachloroethylene, liquefied CO2 with suitable detergent is an alternate solvent used. Liquefied CO2 is not harmful to the ground water. Now days H2O2 used for bleaching clothes in laundry, gives better results and utilizes less water.
-
Question 95 of 106
95. Question
What is used in the conventional method of paper bleaching?
Correct
Bleaching of paper: The Conventional method of bleaching was done with chlorine. Nowadays H2O2 can be used for bleaching paper in presence of catalyst.
Incorrect
Bleaching of paper: The Conventional method of bleaching was done with chlorine. Nowadays H2O2 can be used for bleaching paper in presence of catalyst.
-
Question 96 of 106
96. Question
Which of these products is prepared by one step oxidation of ethene?
Correct
Synthesis of chemicals: Acetaldehyde is now commercially prepared by one step oxidation of ethene in the presence of ionic catalyst in aqueous medium with 90% yield.
Incorrect
Synthesis of chemicals: Acetaldehyde is now commercially prepared by one step oxidation of ethene in the presence of ionic catalyst in aqueous medium with 90% yield.
-
Question 97 of 106
97. Question
Which of the following is an alternate for the petrol in automobiles?
Correct
Instead of petrol, methanol is used as a fuel in automobiles. Neem based pesticides have been synthesized, which are safer than the chlorinated hydrocarbons. Every individual has an important role for preventing pollution and improving our environment.
Incorrect
Instead of petrol, methanol is used as a fuel in automobiles. Neem based pesticides have been synthesized, which are safer than the chlorinated hydrocarbons. Every individual has an important role for preventing pollution and improving our environment.
-
Question 98 of 106
98. Question
How many categories of pollutants are classified?
Correct
Environmental pollution is the effect of undesirable changes in the surrounding that have harmful effects on living things. Pollutants are generally classified as rapidly degradable (e.g. discarded vegetables) slowly degradable (e.g. Agriculture waste) and non-bio degradable pollutants (e.g. DDT, plastic materials).
Incorrect
Environmental pollution is the effect of undesirable changes in the surrounding that have harmful effects on living things. Pollutants are generally classified as rapidly degradable (e.g. discarded vegetables) slowly degradable (e.g. Agriculture waste) and non-bio degradable pollutants (e.g. DDT, plastic materials).
-
Question 99 of 106
99. Question
Which of this pollution greatly affects the biosphere of the earth?
Correct
Atmospheric pollutions include tropospheric and stratospheric pollution. Troposphere and stratosphere greatly affect the biosphere of the earth due to which the study of pollutions in these regions is most important.
Incorrect
Atmospheric pollutions include tropospheric and stratospheric pollution. Troposphere and stratosphere greatly affect the biosphere of the earth due to which the study of pollutions in these regions is most important.
-
Question 100 of 106
100. Question
Choose the Incorrect statements.
- i) Troposphere is the highest region of atmosphere.
- ii) Gaseous pollutants SO, NO, CO, O3 hydrocarbons pollute the troposphere.
- iii) The Particulate pollutants that pollute troposphere are dust, mist, fumes and smog.
Correct
Troposphere is the lowest region of atmosphere in which man, animal and plants exist. Gaseous pollutants like SOx, NOx, CO, CO2, O3 hydrocarbons and particulate pollutants like dust, mist, fumes, smog cause pollutions in troposphere.
Incorrect
Troposphere is the lowest region of atmosphere in which man, animal and plants exist. Gaseous pollutants like SOx, NOx, CO, CO2, O3 hydrocarbons and particulate pollutants like dust, mist, fumes, smog cause pollutions in troposphere.
-
Question 101 of 106
101. Question
- Assertion (A): Acid rain results in the human activities that emit sulphur oxides and nitrogen oxides in the atmosphere.
- Reasoning(R): If the PH value of rain water is lower than 5.6 then it is called as Acid rain.
Correct
Acid rain: When the PH of rain water becomes lower than 5.6 it is called acid rain. Acid rain is a byproduct of various human activities that emit sulphur oxides and nitrogen oxides in atmosphere. It damages buildings, statues and other monuments.
Incorrect
Acid rain: When the PH of rain water becomes lower than 5.6 it is called acid rain. Acid rain is a byproduct of various human activities that emit sulphur oxides and nitrogen oxides in atmosphere. It damages buildings, statues and other monuments.
-
Question 102 of 106
102. Question
Which of the following is not included in the greenhouse gas?
- a) O2
- b) N2
- c) CH4
- d) CFC
Correct
The process of warming up of earth is known as greenhouse effect or global warming. CO2, CH4, O3, CFC, N2 and water vapor present in atmosphere act as a greenhouse gases.
Incorrect
The process of warming up of earth is known as greenhouse effect or global warming. CO2, CH4, O3, CFC, N2 and water vapor present in atmosphere act as a greenhouse gases.
-
Question 103 of 106
103. Question
Which of this greenhouse gas has the lowest heat retaining capacity?
- a) CFC
- b) N2O
- c) CO2
- d) CH4
Correct
Heat retaining capacity of greenhouse gases are called Global Warming Potential (GWP).The GWP based sequence of greenhouse gases is as CFC>N2O>CH4>CO2.
Incorrect
Heat retaining capacity of greenhouse gases are called Global Warming Potential (GWP).The GWP based sequence of greenhouse gases is as CFC>N2O>CH4>CO2.
-
Question 104 of 106
104. Question
Which of these humus cover is termed as soil?
Correct
Lithosphere with humus cover is known as soil. The topsoil provides water and all nutrients required by plants for their growth.
Incorrect
Lithosphere with humus cover is known as soil. The topsoil provides water and all nutrients required by plants for their growth.
-
Question 105 of 106
105. Question
Which of the following does not results in soil pollution?
Correct
Industrial waste, artificial fertilizers and pesticides result in soil pollution.
Incorrect
Industrial waste, artificial fertilizers and pesticides result in soil pollution.
-
Question 106 of 106
106. Question
Which of these methods are used for solid waste management?
Correct
The strategies for controlling environmental pollution are called can be waste management. Waste management involves reduction and proper disposal of waste. Wastes are produced in three forms, solid, liquid and gas. Solid waste can be disposed by segregation, dumping, incineration and composting.
Incorrect
The strategies for controlling environmental pollution are called can be waste management. Waste management involves reduction and proper disposal of waste. Wastes are produced in three forms, solid, liquid and gas. Solid waste can be disposed by segregation, dumping, incineration and composting.
Leaderboard: Environmental Chemistry 11th Science Lessons
Pos. | Name | Entered on | Points | Result |
---|---|---|---|---|
Table is loading | ||||
No data available | ||||