ECAT Chemistry Environmental Chemistry Chapter Test Online

Page 1 of 9

1. Pick out the wrong statement.

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

Troposhere is a dusty zone containing water vapor and clouds.

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.

2. Which one of the following is not a pollutant

SO₂

CO₂

CO

NO₂

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

CO₂ and CO

SO₂ and NO₂

SO₃ and CO

Ozone and dust

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

Unpredictable

Increases

Remains same

Decreases

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

Guanine

Adenine

Cytosine

Tryoxine

6. Colloidal material in the raw water is removed by

Purification

Coagulation

Chlorination

Combustion

7. The pH range of the acid rain is

6.5-6

7-6.5

6-5.6

Less than 5.6

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

Biosphere

Hydrosphere

Stratosphere

Lithosphere

9. 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?

Cross linked or inter connected polymer

Branched

Synthetic polymer

Linear polymer

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

Copper

Chromium (VI)

Chromium (III)

Lead

11. Which of the following has ester linkage?

Nylon

Terylene

PVC

Bakelite

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

Fructose

Maltose

Galactose

Mannose

13. Chlorofluorocarbon releases a chemical harmful to ozone

Chlorine

Sulphure dioxide

Nitrogen peroxide

Fluorine

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

Addition of chemical additives

Mechanical beating of fibers

Pressed to remove moisture

Pulp is dispersed in water and slurry is obtained

15. Classical smog occurs in places of

Excess NH₃

High temperature

Excess SO₂

Low temperature

16. Soil salinity can be measured by

Potometer

Conductivity meter

Porometer

Calorimeter

17. Eutrophication causes reduction in

Dissolved hydrogen

All of these

Dissolved oxygen

Dissolved salts

18. Which one is the most toxie?

SO₂

Carbon

CO

CO₂

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

Aerosols

Mists

Smoke

Fumes

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

Pesticide residue

Radio-active fall out

Household waste

Automobile exhausts

21. The lowest layer of atmosphere is known as the

Ionosphere

Troposphere

None of these

Stratosphere

22. Depletion of ozone layer is due to

Oxides of nitrogen

Oxides of sulphur

Oxides of carbon

None of these

23. An example of water soluble vitamin is

Vitamin E

Vitamin A

Vitamin D

Vitamin C

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

Ozone depletion

CO pollution

CO₂ Pollution

Acid rain

25. Which of the following is an air pollutant?

Nitrogen

Carbon monoxide

Carbon dioxide

Oxygen

Page 2 of 9

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

Calendar stock, Drying, pressing, flow spreader

Flow spreader, Drying, pressing, calendar stock

Calendar stock, flow spreader, pressing drying

Flow spreader, pressing, drying, calendar stock

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

Oxygen

Carbon dioxide

Carbon monoxide

Methane

28. Denaturing of protein is:

Hydrolysis of protein

Unfolding of protein

Three dimensional twisting and folding of peptide chain

Developing hydrogen bonding in peptide chain

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

Intestinal irritation

Change in taste and odour

Fluorosis

Blue baby syndrome

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

Aerosols and high flying jets

Atomic explosions and industrial wastes

Balloons and turbo-prop airplanes

Fungicides, insecticides, bactericides and

31. Shahi Qilla may be destroyed by

Flood in Ravi

Air pollutants from Lahore chemical industries

Temperature mediated spoilage of marble

All of these

32. Fungicides are the pesticides which

Kill insects

Control the growth of fungus

Kill plants

Kill herbs

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

Biuret

Hopkins-cole

All of these

Xanthoproteic test

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

None of these

Fossil fuel

Acid rain

Heat dispersion

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

Additives

Basic elements

Nutrient elements

Trace elements

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

Treatment with chlorine

Treatment with Iodine

Coagulation

Aeration

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

Hg

SO₂

NO₂

Pb

38. Which causes water pollution?

Airplanes

Smoke/fly ash

2, 4-D and pesticides

Automobile exhausts

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

It dry the paper

Web structure is consolidated

It discharge the pulp at the screen of Fourdriner table

It reduces the thickness of paper

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

Riboflavin

Niacin

Trypsin

Ascorbic acid

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

Aeration

Chlorination

Self-oxidation reduction

Coagulation

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

6 days

2 day

5 days

7 days

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

Global warming

Ozone

Smog

Acid rain

44. 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?

Oil leaks and spills

Rain

Disposal of industrial effluents

Livestock waste

45. Fresh sewage is ____________ in nature

Neutral

Acidic

Highly acidic

Alkaline

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

Eucalyptus

Corn straw

Popalr

Fur

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

Easy to spread in the field

Assimilated in the root hairs of plants

More soluble as compared to smaller crystals

Less toxic

48. Biodegradable pollutant is

Sewage

Mercury

Plastic

Asbestos

49. Acid rains are produced by

Excess NO₂ and SO₂ from burning fossil fuels

Excess release of carbon monoxide by incomplete combustion

Excess production of NH₃ by industry and coal gas

Excess formation of CO₂ by combustion and animal respiration

50. Which one is not a pollutant normally?

Carbon dioxide

Hydrocarbons

Carbon monoxide

Sulphur dioxide

Page 3 of 9

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

Plastics

Dissolved oxygen

All of these

Oil

52. Plastics are a pollution problem because many plastics

Burn to produce toxic fumes

Decompose to produce toxic products

Are very inflammable

Are made from petroleum

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

Nose

Ears

Stomach

Eyes

54. Nutrient leach is due to

Combustion of soil

Drying of soil

Acidification of soil

Neutralization of soil

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

4 – 8 ppm

Less than 4 ppm

Greater than 8 ppm

Greater than 4 ppm

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

3

2

4

5

57. The metal present in blood is

Cu

Al

Hg

Fe

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

H₂

CO

NH₃

N₂

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

Chloramines

Alums

KMnO₄

O₃

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

CO₂

NO₂

NO

SO₂

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

Thermosphere

Mesosphere

Stratosphere

Trophosphere

62. Photochemical smog is caused by

CO₂

O₃

CO

NO₂

63. Lithosphere has amount of silicon

27.72%

40.01%

21.13%

35.30%

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

2ppm – 3ppm

2ppm – 4ppm

4ppm – 8ppm

2ppm – 6ppm

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

Epoxy resin

Plastic toys

None of these

PVC

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

Wet scrubber

Cyclone separator

Electrostatic precipitator

Fabric filter

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

10000

100

1000

10

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

Carbon dioxide

Carbon monoxide

Sulphur dioxide

Ozone

69. 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 in fixing of bacteria

To help to clean the atmosphere

To help plant to undergo photosynthesis

To destroy nitrogen oxide from the atmosphere

70. UV radiation bring about

Lung cancer

Skin cancer

Liver cancer

Mouth cancer

71. The molecular formula of a trisaccharide will be

C₁₈H₃₆O₁₈

C₃H₃O₃

C₃H₆O₃

C₁₈H₃₂O₁₆

72. Fluoride pollution mainly affects:

Teeth

Heart

Kideny

Brain

73. Phosphate pollution is caused by

Phosphate rocks and sewage

Weathering of phosphate rocks only

Sewage and agricultural fertilizers

Agricultural fertilizers

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

6.5 kg

4.5 kg

1.5 kg

3 kg

75. Water pollution is mainly due to

Sulphure dioxide

Industrial discharges

Carbon dioxide

Oxygen

Page 4 of 9

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

Can sugar field

Cotton field

Wheat field

Paddy field

77. Ultraviolet radiation from sun causes a reaction that produces

Ozone

Sulphure dioxide

Fluorides

Carbon monoxide

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

Wheat

Cotton

Sugar cane

Paddy rice

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

Neutrality

Buffer action

Acidity

Basicity

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

SO₂ and SO₃

Chlorine nitrate

Acrolein

Peroxy acetyl nitrate

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

Primary structure

Secondary structure

Quaternary structure

Tertiary structure

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

Polystyrene

Polyurea

Polyurethane

Polyester

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

Household waste

Pesticide residue

Radioactive fall out

Automobile exhausts

84. 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 the C – Cl bond

The chlorine atom is larger than the fluorine atom

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

Fluorine is more electronegative than chlorine

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

Growing population

Clean drinking water

Unemployment

Shortage of food

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

Hydrosphere

Biosphere

Atmosphere

Lithosphere

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

Polyester fiber

Varnish

Fiber

Plastic

88. Chief source of water and soil pollution is

All the above

Mining

Thermal power plant

Agro-industry

89. Smog is:

All of these

A combination of smoke and fog

A natural phenomenon

Is colourless

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

Hardness of water decreases

Dissolved oxygen increases

pH of water is controlled

Cl₂ kills the pathogenic bacteria

91. Cracking of polyethene at high temperature gives

Isomorphs

Polymers

Allotropes

Monomers

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

Keeping pH 7.35

pH changes

Heat protein

Oxidizing agent

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

NO

CO

N₂O

N₂

94. The combination of smoke and fog is called

Smog

Secondary pollutant

Primary pollutant

Coagulation

95. Burning of fossil is the main source of pollution

Nitrous oxide

Nitric oxide

Sulphure dioxide

Nitrogen oxide

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

Preventing reaction between oxygen and hemoglobin

Combining with oxygen to form carbon dioxide

Destruction of hemoglobin

Forming stable compound with hemoglobin

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

950 to 1300°C

900 to 1000°C

250 to 500°C

500 to 900°C

98. Potable water is considered to be

Safe for human consumption

The Surface water

The ground water

Now safe or human consumption

99. In fructose the possible optical isomers are

4

16

8

12

100. Spraying of DDT produces pollution of

Air

Air, water and soil

Air and water

Air and soil

Page 5 of 9

101. Chromium (VI is used in)

Fertilizer industry

Water purification

Cement industry

Leather tanning

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

Non-renewable

None

Renewable

Both

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

Phenol

Benzene

Methane

Ethene

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

Sulphure dioxide

Nitrogen oxides and chloro fluorocarbon

Carbon dioxide

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

50%

1%

10%

2%

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

Ferns

Epiphytic lichens

Home worts

Liver worts

107. Glyptal polymer is obtained from glycerol on reacting with

Acetic acid

Phthalic acid

Malonic acid

Maleic acid

108. Water is often treated with chlorine to

Remove hardness

Remove suspended particles

Increase oxygen content

Kill germs

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

Freons

Ferrocene

Polyhalogens

Fullerenes

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

Glycogen

Teflon

Starch

Petroleum

111. The raw material to form nylon is

Butadiene

Adipic acid

Ethylene

Isoprene

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

All of these

Urban and suburban lands

Sewage treatment plants

Factories

113. Drained sewage has B.OD.

None of these

Less than that of water

More than that of water

Equal to that of water

114. Bakelite is obtained from phenol by reacting with

Formaldehyde

Acetal

Chlorobenzene

Acetaldehyde

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

Barium Sulphate

Copper Sulphate

Alum

Nickel Sulphate

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

1 to 2

15 to 20

9 to 10

4 to 5

117. BOD is:

All of these

Usually less than COD

A measure of the organic matter presents in water

Biochemical oxygen demand

118. Photo chemical smog contains __________ as main reactants.

N₂O and burnt hydrocarbons

NO and burnt hydrocarbons

Nitrons oxide and unburnt hydrocarbons

Nilric oxide and unburnt hydrocarbons

119. Atmospheric pollutant is

O₂

CO

N₂

CO₂

120. Septic tank is:

An aerobic attached growth treatment system

An aerobic suspended growth biological treatment system

An anaerobic attached growth biological treatment system

An anaerobic suspended growth treatment system

121. Carbon monoxide is harmful to human beings as it

Has higher affinity for hemoglobin as compared to oxygen

Is antagonistic to CO₂

Is carcinogenic

Is destructive to O₃

122. Environmental pollution affects

Man only

Biotic components

Plants only

Biotic and abiotic components of environment

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

Both

Non-renewable

Renewable

None

124. Which of the following has magnesium?

Chlorophyll

Haemocyanin

Carbonic anhydrase

Vitamin B₁₂

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

C₃

Cl₂

Both b & c

ClO₂

Page 6 of 9

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

Four

One

Three

Two

127. Swage water is purified by

Light

Fishes

Microorganisms

Aquatic plants

128. Thickness of the atmosphere is

1000 km

1500 km

100 km

500 km

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

None

Renewable

Both

Non-renewable

130. The product of addition polymerization reaction is

Polyamide

PVC

Nylon

Terylene

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

4

3

5

2

132. Domestic waste mostly constitutes

Effluents

Air pollution

Biodegradable pollution

Non-biodegradable pollution

133. SO₂ and NO₂ cause pollution due to increase in

Acidity

Basicity

Neutrality

Buffer action

134. Which of the following is a biodegradable polymer?

Polyethene

Cellulose

Nylon-6

Polyvinyl chloride

135. B.O.D. is connected with

Organic matter

None of these

Microbes

Microbes and organic matter

136. Ozone hole is maximum over

Antarctica

Europe

Africa

Asia

137. Result of ozone hole is

Greenhouse effect

UV rays reach the earth

Acid rain

Global warming

138. Drawback DDT as pesticide is

It is less effective than others

It becomes ineffective after some time

Its high cost

It is not easily/rapidly degraded on nature

139. Vegetables oils are

Essential oils obtained from plants

Glycerides of saturated fatty acids

Unsaturated fatty acids

Glycerides of unsaturated fatty acids

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

Sulphur oxide

Carbon monoxide

Chlorofluorocarbons and nitrogen oxides

Carbon dioxide

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

Solid waste disposal sites

Thermal power plant

All of the above

Sewage treatment plant

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

Cellulose

Starch

Glucose

Fructose

143. Pollution is

Release of toxic/undesirable materials in environment

Conservation of energy

Removal of top soil

All the above

144. Sulphure dioxide affects

Plasmodesmata

Cell wall

All membrane systems

Nucleus

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

Orlon

Nylon

Dacron

Rayon

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

All are correct

Supply pure O₂ for breathing

Drink dilute solution of NaHCO₃

Drink dilute solution of CH₃COOH

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

Slightly higher than that when the thunderstorm is not there

Uninfluenced by occurrence of thunderstorm

Which depends on the amount of dust in air

Slightly lower than that of rain water without thunderstorm

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

Photochemical oxidants

Sulphur dioxide

Chlorofluorocarbon

Smog

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

Increased shinning

Becoming dirty

Harmful stress

Melting

150. On hydrolysis sucrose gives

Glucose and maltose

Fructose and lactose

Glucose and fructose

Fructose and maltose

Page 7 of 9

151. The cause of Minamata disease in the pollution of

Arsenic (As) into atmosphere

Organic waste in drinking H₂O

Industrial waste Having Hg

Oil spills in H₂O

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

Carbon monoxide

Sulphure dioxide

Nitrous oxide

Ozone

153. BOD is

Biological oxygen deficit

None of these

Biological oxygen demand

Biosphere oxygen demand

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

70

60

80

90

155. BOD/COD ratio will always be:

More than 1

Equal to 1

Less than 1

None of these

156. Calendar stock is process in paper making in which

Moisture is removed

Paper is wounded in the form of reel

Paper thickness in reduced

Pulp is spread over fabric or screen

157. Pick up the correct statement

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

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

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

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

Calcium (II)

Chromium (VI)

Chromium (III)

Sodium (I)

159. Increased asthmatic attacks in certain seasons are related to

Wet and dry environment

Low temperature

Inhalation of seasonal pollen

Eating of seasonal vegetables

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

Troposphere

Stratosphere

Mesosphere

Thermosphere

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

Increases nitrogen contents of soil

Acts pesticide

Increases oxygen contents of soil

Increases sulphur contents of soil

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

Heteropolymer

Copolymer

Terpolymer

Homopolymer

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

Lead

Nitrogen oxide

Mercury

Sulphur oxide

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

Protein

Glucose

Starch

Nylon 66

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

250 to 500°C

500 to 900°C

950 to 1300+C

900 to 1000°C

166. All fats are

Hydrocarbons

Carbohydrates

Esters

Aldehydes

167. Ozone hole is

Decomposition of O₂ to O₃ in sunlight

Increase of concentration of O₃ in tropical region

Depletion in total amount of O₃ in particular region

Formation of a complex of O₃ with hydrocarbons

168. Most hazardous metal pollutant of automobile exhaust is:

Lead

Mercury

Copper

Cadmium

169. Which statement is incorrect about starch and cellulose?

Both are polysaccharides

Cellulose is greater in amount on earth as compared to starch

Both can be found in living things

Both are formed by same type of monomers

170. Minamata disease is due to pollution of

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

Organic waste into drinking water

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

Rapid growth of population

Industrialization

Urbanization

Increase of plantation

172. SO₂ and NO₂ produce pollution by increasing

Buffer action

Alkalinity

Neutrality

Acidity

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

Nylon 66

Starch

Terylene

Bakelite

174. Cyclone collector is used to reduce

Noise pollution

Radioactive pollution

Air pollution

Water pollution

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

Starch

Glucose

TiO₂

Tale

Page 8 of 9

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

Renewable

Both

Non renewable

None

177. Air pollution is not caused by

Hydroelectric power

Industries

Automobiles

Pollen grains

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

Chemical composition

Physical properties

All of these

Manufacturing process

179. The prosthetic group is glycoprotein is

Nucleic acid

Carbohydrate

Fat

Vitamin

180. Glucose contains

One – CHO group

Four secondary alcoholic group

All are correct

One primary alcoholic group

181. In human liver, which substance cause cancer

Methane

H₂SO₃

Caron dioxide

Chloroform

182. Ozone hole refers to

Increase concentration of ozone

Reduction of thickness of ozone in troposphere

Hole in ozone layers

Reduction in thickness of ozone layer in stratosphere

183. Cyclone collector is used for minimizing

Radioactive pollution

Water pollution

Noise pollution

Air pollution

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

Corrosion

Undesirable plant growth

Non-biodegradable foam

Explosion

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

Chromate ion (CrO₄²¯)

Dichromate ion (Cr₂O₇²¯)

Sulphate ion (SO₄²¯)

Permanganate ion (MnO₄)

186. Which substance is used to bleach the pulp?

NaCl

NaClO

NaOH

Na₂SO₃

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

PMMA

Bunna-S

Neoprene

Glyptal

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

Fluorine

Chlorine

Mercury

Boron

189. Silk is an example of

Vegetable fiber

Animal fiber

None of these

Mineral fiber

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

Chromium VI

Chromium IV

Chromium V

Chromium III

191. A condensation polymer among the following is

Dacron

Polystyrene

Teflon

PVC

192. Polymer formation from monomers starts by

Hydrolysis of monomers

Condensation reaction between monomers

Conversion of monomer to monomer ions by protons

Coordination reaction between monomers

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

900 to 100°C

500 to 900°C

250 to 500°C

950 to 1300°C

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

12

8

1

4

195. Ozone depletion in stratosphere shall result in

Global warming

None of these

Forest fires

Increased incidence of skin cancer

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

Elastomers

Thermoplastics

Fibers

Thermosetting polymers

197. Which of the following is fully fluorinated polymer?

Neoprene

PVC

Thiokol

Teflon

198. Of the following a step growth polymer

PVC

Bakelite

Polyethylene

Teflon

199. Carbon monoxide is pollutant as it

Combines with hemoglobin

Inhibits glycolysis

Inactivates nerves

Combines with oxygen

200. Two vitamins absorbed from intestine along with fats are

A, C

D, B

A, D

A, B

Page 9 of 9

201. Keratomalacia is caused due to the deficiency of vitamin

K

B

D

A

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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