ECAT Chemistry Environmental Chemistry Chapter Test Online

Page 1 of 9

1. Which one is the most toxie?

CO₂

Carbon

SO₂

CO

2. The main pollutant of leather tanneries in the waste water is due to the salt of:

Lead

Copper

Chromium (VI)

Chromium (III)

3. Which of the following is a major source of thermal pollution in water bodies?

Sewage treatment plant

Thermal power plant

All of the above

Solid waste disposal sites

4. Most hazardous metal pollutant of automobile exhaust is:

Lead

Cadmium

Mercury

Copper

5. Bakelite is obtained from phenol by reacting with

Acetaldehyde

Chlorobenzene

Acetal

Formaldehyde

6. Vegetables oils are

Unsaturated fatty acids

Essential oils obtained from plants

Glycerides of saturated fatty acids

Glycerides of unsaturated fatty acids

7. Pick up the correct statement

Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours

CO which is major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog

During formation of smog the level of ozone in the atmosphere goes down

Classical smog has an oxidizing character while the photochemical smog is reducing in character

8. Plastics are a pollution problem because many plastics

Burn to produce toxic fumes

Are very inflammable

Are made from petroleum

Decompose to produce toxic products

9. Depletion of ozone layer is due to

Oxides of sulphur

Oxides of carbon

Oxides of nitrogen

None of these

10. Newspapers can be recycled again and again by how many times?

4

3

5

2

11. Which factor is helping to reduce the environmental pollution?

Industrialization

Rapid growth of population

Urbanization

Increase of plantation

12. The equality of raw water is improved when it is chlorinated because

Dissolved oxygen increases

Cl₂ kills the pathogenic bacteria

pH of water is controlled

Hardness of water decreases

13. Natural fertilizer provides potassium in the form of K₂O potash

1.5 kg

4.5 kg

3 kg

6.5 kg

14. Which one of the following is not a pollutant

CO

SO₂

NO₂

CO₂

15. Which substance is used to bleach the pulp?

NaOH

NaClO

NaCl

Na₂SO₃

16. Atmosphere of big/metropolitan cities is polluted most by

Household waste

Automobile exhausts

Pesticide residue

Radio-active fall out

17. Which substance is not used are additive in paper making?

Glucose

Tale

TiO₂

Starch

18. Carbon monoxide is harmful to human beings as it

Is carcinogenic

Has higher affinity for hemoglobin as compared to oxygen

Is antagonistic to CO₂

Is destructive to O₃

19. Which substance is used as filler or additive in papermaking?

Starch

Cellulose

Glucose

Fructose

20. Which of the following has ester linkage?

Terylene

PVC

Bakelite

Nylon

21. Among the following polymers, the strongest molecular forces are present in

Elastomers

Thermosetting polymers

Fibers

Thermoplastics

22. Drained sewage has B.OD.

Less than that of water

Equal to that of water

None of these

More than that of water

23. Glucose contains

One primary alcoholic group

All are correct

One – CHO group

Four secondary alcoholic group

24. Air, water, soil etc are the examples of _________ resources.

Non-renewable

None

Both

Renewable

25. The yellowish colour in photochemical smog is due to the presence of

SO₂

NO₂

CO₂

NO

Page 2 of 9

26. Proxy acetyl nitrate (PAN) is an irritant to human beings and it affects

Ears

Stomach

Nose

Eyes

27. Classical smog occurs in places of

Excess SO₂

Low temperature

Excess NH₃

High temperature

28. Photochemical smog is caused by

CO

O₃

CO₂

NO₂

29. Which sequence of steps is correct in paper making from pulp?

Flow spreader, pressing, drying, calendar stock

Calendar stock, Drying, pressing, flow spreader

Flow spreader, Drying, pressing, calendar stock

Calendar stock, flow spreader, pressing drying

30. The gases in the atmosphere are essential for sustaining life on earth. Thus oxygen is required for breathing. What for is carbon dioxide required?

To help plant to undergo photosynthesis

To help to clean the atmosphere

To help in fixing of bacteria

To destroy nitrogen oxide from the atmosphere

31. Of the following a step growth polymer

PVC

Teflon

Bakelite

Polyethylene

32. Atmospheric pollutant is

O₂

CO₂

CO

N₂

33. Which one of the following is not a polymer?

Glycogen

Teflon

Petroleum

Starch

34. Ozone layer of stratosphere requires protection from indiscriminate use of

Balloons and turbo-prop airplanes

Aerosols and high flying jets

Fungicides, insecticides, bactericides and

Atomic explosions and industrial wastes

35. Pollution is

All the above

Release of toxic/undesirable materials in environment

Removal of top soil

Conservation of energy

36. Which one of the following is a water soluble vitamin?

Niacin

Ascorbic acid

Trypsin

Riboflavin

37. Oceans, rivers, streams, lakes, polar ice caps, glaciers and group water reservoirs are included in

Atmosphere

Hydrosphere

Lithosphere

Biosphere

38. Which of the following groups of plants can be used as indicators of SO pollution of air?

Epiphytic lichens

Ferns

Home worts

Liver worts

39. Domestic waste mostly constitutes

Air pollution

Non-biodegradable pollution

Biodegradable pollution

Effluents

40. Chief source of water and soil pollution is

Mining

Thermal power plant

Agro-industry

All the above

41. Which of the following is not an air pollutant?

N₂

NO

N₂O

CO

42. In human liver, which substance cause cancer

Methane

Caron dioxide

Chloroform

H₂SO₃

43. Increasing skin cancer and high mutation rate are due to

CO pollution

Ozone depletion

Acid rain

CO₂ Pollution

44. Thickness of the atmosphere is

500 km

100 km

1500 km

1000 km

45. Shahi Qilla may be destroyed by

Temperature mediated spoilage of marble

Air pollutants from Lahore chemical industries

Flood in Ravi

All of these

46. Phosphate pollution is caused by

Phosphate rocks and sewage

Agricultural fertilizers

Weathering of phosphate rocks only

Sewage and agricultural fertilizers

47. Which of the following fibers are made of polyamides?

Orlon

Nylon

Dacron

Rayon

48. What is the function of Head box in paper making machine?

Web structure is consolidated

It dry the paper

It reduces the thickness of paper

It discharge the pulp at the screen of Fourdriner table

49. Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

Lead

Mercury

Nitrogen oxide

Sulphur oxide

50. Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases?

NO₂

SO₂

Hg

Pb

Page 3 of 9

51. Fresh sewage is ____________ in nature

Neutral

Highly acidic

Acidic

Alkaline

52. A condensation polymer among the following is

PVC

Polystyrene

Dacron

Teflon

53. Which of the following is used as water disinfectant to avoid the formation of toxic compounds?

Cl₂

C₃

Both b & c

ClO₂

54. Soil salinity can be measured by

Calorimeter

Porometer

Conductivity meter

Potometer

55. Which one of the followings is non-woody raw material used for making pulp and paper?

Corn straw

Popalr

Eucalyptus

Fur

56. Pick out the wrong statement.

The radio waves used in the long distance radio communication are reflected back to earth by stratosphere.

The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone.

Mesosphere is characterized by very low atmospheric pressure and low temperature.

Troposhere is a dusty zone containing water vapor and clouds.

57. In the upper atmosphere chlorofluorocarbons (CFCO₃, CF₂Cl₂) are broken down to give chlorine radicals but not fluorine radicals. What is the best explanation for this

The C – F bond is stronger than C – Cl bond

The C – F bond is stronger than the C – Cl bond

The chlorine atom is larger than the fluorine atom

Fluorine is more electronegative than chlorine

58. BOD is:

Biochemical oxygen demand

All of these

Usually less than COD

A measure of the organic matter presents in water

59. Chromium (VI is used in)

Water purification

Cement industry

Fertilizer industry

Leather tanning

60. Thermoplastic polymer can be softened and hardened when cool repeatedly. Which one is not a thermoplastic among the following?

PVC

Epoxy resin

None of these

Plastic toys

61. The molecular formula of a trisaccharide will be

C₃H₆O₃

C₁₈H₃₂O₁₆

C₁₈H₃₆O₁₈

C₃H₃O₃

62. Carbon monoxide is pollutant as it

Combines with oxygen

Inhibits glycolysis

Inactivates nerves

Combines with hemoglobin

63. Lithosphere has amount of silicon

40.01%

21.13%

27.72%

35.30%

64. Ozone depletion in stratosphere shall result in

None of these

Global warming

Increased incidence of skin cancer

Forest fires

65. Which of the following forms a toxic substance in blood by combining with hemoglobin?

Oxygen

Carbon monoxide

Methane

Carbon dioxide

66. Newspaper can be recycled again and again how many times?

5

2

3

4

67. The main pollutant of leather tanneries in the waste water is

Chromium V

Chromium III

Chromium VI

Chromium IV

68. In the glass manufacturing process, annealing is done to prevent glass from

Harmful stress

Increased shinning

Melting

Becoming dirty

69. In fructose the possible optical isomers are

12

8

16

4

70. Choose the chief air pollutant among the following which depletes ozone layer

Basicity

Buffer action

Acidity

Neutrality

71. Which one of the following macromolecules contains carbon, hydrogen, nitrogen and oxygen in it?

Starch

Bakelite

Nylon 66

Terylene

72. The cause of Minamata disease in the pollution of

Organic waste in drinking H₂O

Arsenic (As) into atmosphere

Industrial waste Having Hg

Oil spills in H₂O

73. BOD/COD ratio will always be:

None of these

More than 1

Less than 1

Equal to 1

74. Which of the following is a secondary air pollutant?

Ozone

Sulphur dioxide

Carbon dioxide

Carbon monoxide

75. Glyptal polymer is obtained from glycerol on reacting with

Malonic acid

Acetic acid

Phthalic acid

Maleic acid

Page 4 of 9

76. Denaturing of protein is:

Three dimensional twisting and folding of peptide chain

Hydrolysis of protein

Unfolding of protein

Developing hydrogen bonding in peptide chain

77. The metal present in blood is

Hg

Cu

Al

Fe

78. Glass is classified into different types on the basis of its

Physical properties

Chemical composition

Manufacturing process

All of these

79. Which of the following are likely to be present in photochemical smog?

Photochemical oxidants

Sulphur dioxide

Chlorofluorocarbon

Smog

80. A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid

One

Two

Four

Three

81. Which is unnecessary for purification of water for drinking purposes?

Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

82. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

Corrosion

Undesirable plant growth

Explosion

Non-biodegradable foam

83. Result of ozone hole is

UV rays reach the earth

Greenhouse effect

Acid rain

Global warming

84. Cracking of polyethene at high temperature gives

Isomorphs

Polymers

Allotropes

Monomers

85. Mottling of teeth is due to presence of an element in drinking water

Mercury

Fluorine

Chlorine

Boron

86. Ultraviolet radiation from sun causes a reaction that produces

Sulphure dioxide

Ozone

Carbon monoxide

Fluorides

87. Choose the chief air pollutant among the following which depletes ozone layer

Carbon monoxide

Chlorofluorocarbons and nitrogen oxides

Sulphur oxide

Carbon dioxide

88. Swage water is purified by

Microorganisms

Fishes

Light

Aquatic plants

89. Acid rain is due to increase in atmospheric concentration of

CO₂ and CO

Ozone and dust

SO₂ and NO₂

SO₃ and CO

90. Eutrophication causes reduction in

Dissolved hydrogen

All of these

Dissolved salts

Dissolved oxygen

91. The product of addition polymerization reaction is

Polyamide

Terylene

PVC

Nylon

92. The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from

2ppm – 3ppm

2ppm – 6ppm

2ppm – 4ppm

4ppm – 8ppm

93. Which causes water pollution?

Smoke/fly ash

Automobile exhausts

2, 4-D and pesticides

Airplanes

94. Which of the following is a non-point source of water pollution?

Urban and suburban lands

Factories

Sewage treatment plants

All of these

95. Which treatment is not done with pulp before delivering it to paper making machine

Pulp is dispersed in water and slurry is obtained

Pressed to remove moisture

Mechanical beating of fibers

Addition of chemical additives

96. A person is affected with carbon monoxide gas. How can we save him/her by adverse effect of the poisonous gas?

Drink dilute solution of CH₃COOH

Supply pure O₂ for breathing

All are correct

Drink dilute solution of NaHCO₃

97. Which one of the following is not type of polymer?

Heteropolymer

Homopolymer

Copolymer

Terpolymer

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

Peroxy acetyl nitrate

Chlorine nitrate

SO₂ and SO₃

Acrolein

99. Most of the atmospheric air pollutants are present in large quantity in

Thermosphere

Mesosphere

Stratosphere

Trophosphere

100. Which field produces significant amount of methane in the atmosphere?

Can sugar field

Cotton field

Paddy field

Wheat field

Page 5 of 9

101. The prosthetic group is glycoprotein is

Vitamin

Nucleic acid

Carbohydrate

Fat

102. Photo chemical smog contains __________ as main reactants.

Nilric oxide and unburnt hydrocarbons

N₂O and burnt hydrocarbons

Nitrons oxide and unburnt hydrocarbons

NO and burnt hydrocarbons

103. ___________ are those resources which once used on exhausted cannot be reused.

None

Renewable

Both

Non-renewable

104. Water is often treated with chlorine to

Remove suspended particles

Kill germs

Remove hardness

Increase oxygen content

105. Which of the following is not a marine pollutant?

Plastics

Oil

Dissolved oxygen

All of these

106. Drawback DDT as pesticide is

It becomes ineffective after some time

Its high cost

It is not easily/rapidly degraded on nature

It is less effective than others

107. When rain is accompanied by a thunderstorm. The collected rain water will have a pH value

Which depends on the amount of dust in air

Slightly lower than that of rain water without thunderstorm

Slightly higher than that when the thunderstorm is not there

Uninfluenced by occurrence of thunderstorm

108. Surface and ground water sources are contaminated by various human activities. Which of the following is not a human activity that causes contamination in fresh water?

Disposal of industrial effluents

Livestock waste

Rain

Oil leaks and spills

109. Which of the following is fully fluorinated polymer?

PVC

Neoprene

Teflon

Thiokol

110. The lowest layer of atmosphere is known as the

None of these

Ionosphere

Stratosphere

Troposphere

111. How much percentage of total water is available as fresh water?

10%

1%

50%

2%

112. Which one is not a pollutant normally?

Carbon monoxide

Hydrocarbons

Carbon dioxide

Sulphur dioxide

113. SO₂ and NO₂ produce pollution by increasing

Buffer action

Acidity

Alkalinity

Neutrality

114. Chemical oxygen demand of water (COD) is measure by reacting water with

Chromate ion (CrO₄²¯)

Permanganate ion (MnO₄)

Dichromate ion (Cr₂O₇²¯)

Sulphate ion (SO₄²¯)

115. Septic tank is:

An aerobic attached growth treatment system

An aerobic suspended growth biological treatment system

An anaerobic suspended growth treatment system

An anaerobic attached growth biological treatment system

116. The structure of a polymer depends upon how the monomer – repeating unit joins to make a polymer. What is not the type of structure of a polymer?

Linear polymer

Cross linked or inter connected polymer

Synthetic polymer

Branched

117. Spraying of DDT produces pollution of

Air

Air, water and soil

Air and water

Air and soil

118. Choose a point which is not included in the components of environment

Hydrosphere

Biosphere

Stratosphere

Lithosphere

119. A single chlorine free radical can destroy how many ozone molecules

100

1000

10

10000

120. Colloidal material in the raw water is removed by

Purification

Combustion

Coagulation

Chlorination

121. In big/metropolitan cities, atmosphere is mostly polluted due to

Pesticide residue

Automobile exhausts

Household waste

Radioactive fall out

122. Which one of the following is used as coagulant for purification potable water?

Barium Sulphate

Alum

Nickel Sulphate

Copper Sulphate

123. Soft drinks and baby feeding bottles are generally made up of

Polystyrene

Polyurea

Polyester

Polyurethane

124. Fungicides are the pesticides which

Kill herbs

Kill insects

Kill plants

Control the growth of fungus

125. Fluoride pollution mainly affects:

Kideny

Heart

Teeth

Brain

Page 6 of 9

126. All fats are

Carbohydrates

Hydrocarbons

Aldehydes

Esters

127. Violet colour is obtained when dilute CuSO₄ is added in alkaline solution of protein. This test is known as

Biuret

All of these

Xanthoproteic test

Hopkins-cole

128. The percentage of suspended solid waste in raw water is removed by coagulation is

60

80

70

90

129. Which of the following is a biodegradable polymer?

Cellulose

Nylon-6

Polyvinyl chloride

Polyethene

130. Potable water is considered to be

The Surface water

Safe for human consumption

The ground water

Now safe or human consumption

131. Minamata disease is due to pollution of

Arsenic into the atmosphere

Organic waste into drinking water

Industrial waste containing mercury into fishing water

Oil spill in water

132. Two vitamins absorbed from intestine along with fats are

A, B

A, C

D, B

A, D

133. Which of the following devices is suitable for the removal of gaseous pollutants?

Cyclone separator

Fabric filter

Wet scrubber

Electrostatic precipitator

134. When urea is applied to crop it quickly hydrolysis to give ammonium carbonate, which is unstable and decomposes to release the gas

N₂

H₂

NH₃

CO

135. The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to _____________ percent.

4

1

8

12

136. Which one of the following dissolves more rapidly in blood hemoglobin than oxygen?

Ozone

Nitrous oxide

Carbon monoxide

Sulphure dioxide

137. As it passes into food chain, the concentration of DDT

Increases

Decreases

Unpredictable

Remains same

138. Acid rains are produced by

Excess formation of CO₂ by combustion and animal respiration

Excess NO₂ and SO₂ from burning fossil fuels

Excess production of NH₃ by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

139. Burning of fossil is the main source of pollution

Nitrous oxide

Nitrogen oxide

Sulphure dioxide

Nitric oxide

140. The elements like calcium, nitrogen and phosphorus added into the soil in large amounts are called

Trace elements

Nutrient elements

Basic elements

Additives

141. Which one of the following is not an example of chain growth polymer?

Glyptal

Neoprene

Bunna-S

PMMA

142. A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a

Plastic

Polyester fiber

Fiber

Varnish

143. On hydrolysis sucrose gives

Fructose and maltose

Glucose and fructose

Fructose and lactose

Glucose and maltose

144. Water pollution is mainly due to

Industrial discharges

Carbon dioxide

Oxygen

Sulphure dioxide

145. Most of the fertilizer are in prilled form because it is

Easy to spread in the field

More soluble as compared to smaller crystals

Assimilated in the root hairs of plants

Less toxic

146. Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called

Aerosols

Fumes

Mists

Smoke

147. What is the effect of polluted air on environment?

Smog

Global warming

Acid rain

Ozone

148. Cyclone collector is used for minimizing

Water pollution

Noise pollution

Radioactive pollution

Air pollution

149. Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called

Stratosphere

Mesosphere

Thermosphere

Troposphere

150. Nutrient leach is due to

Drying of soil

Neutralization of soil

Acidification of soil

Combustion of soil

Page 7 of 9

151. Polymer formation from monomers starts by

Conversion of monomer to monomer ions by protons

Condensation reaction between monomers

Coordination reaction between monomers

Hydrolysis of monomers

152. What do you see as the main problem of Pakistan?

Clean drinking water

Unemployment

Growing population

Shortage of food

153. Chief air pollutant which is likely to deplete ozone layer

Carbon dioxide

Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbon

154. Denaturation of protein means the structure of protein is disrupted indicate which factor does not denature protein

Keeping pH 7.35

pH changes

Oxidizing agent

Heat protein

155. Which statement is incorrect about starch and cellulose?

Cellulose is greater in amount on earth as compared to starch

Both are polysaccharides

Both are formed by same type of monomers

Both can be found in living things

156. The combination of smoke and fog is called

Smog

Coagulation

Primary pollutant

Secondary pollutant

157. To avoid the formation of toxic compounds with chlorine which substance is sued for disinfecting water?

Alums

Chloramines

KMnO₄

O₃

158. The temperature in the incineration of industrial and hazardous waste process has a range

250 to 500°C

500 to 900°C

950 to 1300°C

900 to 100°C

159. Smog is:

A combination of smoke and fog

Is colourless

All of these

A natural phenomenon

160. Biochemical oxygen demand(BOD) is the capacity of organic matter is natural water to consumer oxygen with in a period of

7 days

5 days

6 days

2 day

161. Environmental pollution affects

Man only

Biotic and abiotic components of environment

Plants only

Biotic components

162. Which of the following is an example of ketohexose?

Fructose

Maltose

Mannose

Galactose

163. Ozone hole refers to

Reduction in thickness of ozone layer in stratosphere

Hole in ozone layers

Reduction of thickness of ozone in troposphere

Increase concentration of ozone

164. BOD is

None of these

Biosphere oxygen demand

Biological oxygen deficit

Biological oxygen demand

165. Choose the crop for which ammonium nitrate is nit used

Wheat

Paddy rice

Sugar cane

Cotton

166. Increased asthmatic attacks in certain seasons are related to

Inhalation of seasonal pollen

Wet and dry environment

Eating of seasonal vegetables

Low temperature

167. UV radiation bring about

Liver cancer

Lung cancer

Mouth cancer

Skin cancer

168. Which one of the following compounds is not of a polymer?

Starch

Nylon 66

Glucose

Protein

169. Keratomalacia is caused due to the deficiency of vitamin

K

A

D

B

170. Ozone hole is

Depletion in total amount of O₃ in particular region

Increase of concentration of O₃ in tropical region

Formation of a complex of O₃ with hydrocarbons

Decomposition of O₂ to O₃ in sunlight

171. Which one of the following species is more dangerous and cause cancer?

Calcium (II)

Chromium (III)

Sodium (I)

Chromium (VI)

172. Biodegradable pollutant is

Mercury

Asbestos

Sewage

Plastic

173. Calendar stock is process in paper making in which

Pulp is spread over fabric or screen

Paper thickness in reduced

Paper is wounded in the form of reel

Moisture is removed

174. Which process is not involved to improve the qualities of raw water?

Self-oxidation reduction

Chlorination

Coagulation

Aeration

175. Fossil fuels like coal, oil, natural gas and metals are the examples of _________ resources.

Non-renewable

None

Both

Renewable

Page 8 of 9

176. SO₂ and NO₂ cause pollution due to increase in

Neutrality

Basicity

Acidity

Buffer action

177. Farmers and gardeners often treat soil with urea because it will

Increases nitrogen contents of soil

Increases sulphur contents of soil

Acts pesticide

Increases oxygen contents of soil

178. Cyclone collector is used to reduce

Noise pollution

Air pollution

Radioactive pollution

Water pollution

179. Some O₂ is present in water. The water will be considered as “polluted water” when concentration of O₂ in it will be

Less than 4 ppm

Greater than 8 ppm

Greater than 4 ppm

4 – 8 ppm

180. Which one is the major reason for pollution in big cities?

None of these

Heat dispersion

Acid rain

Fossil fuel

181. Silk is an example of

Mineral fiber

Animal fiber

None of these

Vegetable fiber

182. Which structure of protein gives the sequence of amino acids only?

Secondary structure

Primary structure

Quaternary structure

Tertiary structure

183. B.O.D. is connected with

Organic matter

Microbes and organic matter

Microbes

None of these

184. Sulphure dioxide affects

Plasmodesmata

All membrane systems

Cell wall

Nucleus

185. Which of the following is not present in nucleotide?

Tryoxine

Guanine

Adenine

Cytosine

186. The pH range of the acid rain is

Less than 5.6

6-5.6

6.5-6

7-6.5

187. Which substances do not react immediately with bromine water?

Methane

Benzene

Ethene

Phenol

188. __________ are the resources that can be replenished by physical and biological means.

Renewable

None

Non renewable

Both

189. Which of the following is an air pollutant?

Oxygen

Nitrogen

Carbon monoxide

Carbon dioxide

190. Air pollution is not caused by

Pollen grains

Industries

Hydroelectric power

Automobiles

191. Ozone hole is maximum over

Asia

Europe

Africa

Antarctica

192. In sewage treatment, the detention period allowed for oxidation ponds ranges from ___________ weeks.

9 to 10

4 to 5

15 to 20

1 to 2

193. The raw material to form nylon is

Ethylene

Butadiene

Adipic acid

Isoprene

194. Chlorofluorocarbon releases a chemical harmful to ozone

Fluorine

Sulphure dioxide

Chlorine

Nitrogen peroxide

195. The temperature in the incineration of industrial and hazardons water process had a range

250 to 500°C

900 to 1000°C

500 to 900°C

950 to 1300+C

196. Excess fluoride in drinking water is likely to cause:

Fluorosis

Blue baby syndrome

Change in taste and odour

Intestinal irritation

197. An example of water soluble vitamin is

Vitamin A

Vitamin D

Vitamin C

Vitamin E

198. Which of the following has magnesium?

Chlorophyll

Carbonic anhydrase

Vitamin B₁₂

Haemocyanin

199. Incineration of municipal waste is carried out in the temperature range of

250 to 500°C

500 to 900°C

950 to 1300°C

900 to 1000°C

200. Which of the following is responsible for depletion of the ozone layer un the upper strata of the atmosphere?

Fullerenes

Polyhalogens

Freons

Ferrocene

Page 9 of 9

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

Destruction of hemoglobin

Forming stable compound with hemoglobin

Preventing reaction between oxygen and hemoglobin

Combining with oxygen to form carbon dioxide

Total Questions:	201
Time Allowed:	60 Minutes
Total Marks:	201
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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