Environmental Chemistry Online Mcqs Test

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1. The combination of smoke and fog is called

Secondary pollutant

Primary pollutant

Coagulation

Smog

2. Cyclone collector is used to reduce

Water pollution

Noise pollution

Radioactive pollution

Air pollution

3. 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

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

Copolymer

Homopolymer

Heteropolymer

Terpolymer

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

Automobile exhausts

Pesticide residue

Radio-active fall out

Household waste

6. SO₂ and NO₂ produce pollution by increasing

Buffer action

Acidity

Alkalinity

Neutrality

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

Less toxic

More soluble as compared to smaller crystals

Easy to spread in the field

Assimilated in the root hairs of plants

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

Ferrocene

Polyhalogens

Fullerenes

Freons

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

Cl₂

C₃

Both b & c

ClO₂

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

Stratosphere

Lithosphere

Biosphere

Hydrosphere

11. Denaturing of protein is:

Three dimensional twisting and folding of peptide chain

Hydrolysis of protein

Developing hydrogen bonding in peptide chain

Unfolding of protein

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

Carbon dioxide

Sulphure dioxide

Nitrogen oxides and chloro fluorocarbon

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

Polystyrene

Polyurethane

Polyurea

Polyester

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

Xanthoproteic test

Biuret

Hopkins-cole

All of these

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

Thermoplastics

Fibers

Thermosetting polymers

Elastomers

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

Increase of plantation

Urbanization

Rapid growth of population

Industrialization

17. Depletion of ozone layer is due to

Oxides of sulphur

Oxides of carbon

Oxides of nitrogen

None of these

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

Solid waste disposal sites

Thermal power plant

Sewage treatment plant

All of the above

19. Phosphate pollution is caused by

Sewage and agricultural fertilizers

Agricultural fertilizers

Weathering of phosphate rocks only

Phosphate rocks and sewage

20. Fungicides are the pesticides which

Kill insects

Kill plants

Kill herbs

Control the growth of fungus

21. Classical smog occurs in places of

Low temperature

Excess NH₃

High temperature

Excess SO₂

22. Smog is:

Is colourless

A natural phenomenon

A combination of smoke and fog

All of these

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

4

5

2

3

24. Pick up the correct statement

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

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

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

25. On hydrolysis sucrose gives

Fructose and maltose

Fructose and lactose

Glucose and fructose

Glucose and maltose

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

Cotton field

Can sugar field

Wheat field

Paddy field

27. Potable water is considered to be

Now safe or human consumption

The ground water

The Surface water

Safe for human consumption

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

Chlorofluorocarbon

Sulphur dioxide

Smog

Photochemical oxidants

29. Which one of the following is not a pollutant

CO

NO₂

CO₂

SO₂

30. A condensation polymer among the following is

Polystyrene

PVC

Dacron

Teflon

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

Chromate ion (CrO₄²¯)

Permanganate ion (MnO₄)

Dichromate ion (Cr₂O₇²¯)

Sulphate ion (SO₄²¯)

32. BOD is

None of these

Biological oxygen deficit

Biosphere oxygen demand

Biological oxygen demand

33. Nutrient leach is due to

Drying of soil

Combustion of soil

Acidification of soil

Neutralization of soil

34. Domestic waste mostly constitutes

Non-biodegradable pollution

Air pollution

Biodegradable pollution

Effluents

35. Which one is not a pollutant normally?

Carbon dioxide

Sulphur dioxide

Hydrocarbons

Carbon monoxide

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

KMnO₄

O₃

Chloramines

Alums

37. Swage water is purified by

Fishes

Aquatic plants

Microorganisms

Light

38. Chief source of water and soil pollution is

Mining

Thermal power plant

Agro-industry

All the above

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

Phenol

Ethene

Methane

Benzene

40. The raw material to form nylon is

Adipic acid

Butadiene

Isoprene

Ethylene

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

Flow spreader, pressing, drying, calendar stock

Calendar stock, flow spreader, pressing drying

Calendar stock, Drying, pressing, flow spreader

Flow spreader, Drying, pressing, calendar stock

42. Keratomalacia is caused due to the deficiency of vitamin

D

A

K

B

43. Ultraviolet radiation from sun causes a reaction that produces

Ozone

Carbon monoxide

Fluorides

Sulphure dioxide

44. Vegetables oils are

Glycerides of unsaturated fatty acids

Unsaturated fatty acids

Essential oils obtained from plants

Glycerides of saturated fatty acids

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

Alum

Barium Sulphate

Copper Sulphate

Nickel Sulphate

46. Drained sewage has B.OD.

Equal to that of water

Less than that of water

None of these

More than that of water

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

Supply pure O₂ for breathing

Drink dilute solution of CH₃COOH

Drink dilute solution of NaHCO₃

All are correct

48. B.O.D. is connected with

Microbes and organic matter

Organic matter

None of these

Microbes

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

H₂

NH₃

N₂

CO

50. Fluoride pollution mainly affects:

Brain

Teeth

Kideny

Heart

Page 3 of 9

51. The metal present in blood is

Hg

Cu

Fe

Al

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

Starch

Cellulose

Glucose

Fructose

53. Which of the following has magnesium?

Vitamin B₁₂

Chlorophyll

Haemocyanin

Carbonic anhydrase

54. Ozone hole is maximum over

Europe

Africa

Antarctica

Asia

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

Corrosion

Explosion

Non-biodegradable foam

Undesirable plant growth

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

Growing population

Clean drinking water

Shortage of food

Unemployment

57. Which one is the most toxie?

SO₂

Carbon

CO

CO₂

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

Global warming

Ozone

Acid rain

Smog

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

Riboflavin

Ascorbic acid

Trypsin

Niacin

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

Heat protein

Keeping pH 7.35

pH changes

Oxidizing agent

61. Carbon monoxide is harmful to human beings as it

Has higher affinity for hemoglobin as compared to oxygen

Is destructive to O₃

Is carcinogenic

Is antagonistic to CO₂

62. Drawback DDT as pesticide is

It is less effective than others

Its high cost

It is not easily/rapidly degraded on nature

It becomes ineffective after some time

63. Ozone hole is

Formation of a complex of O₃ with hydrocarbons

Depletion in total amount of O₃ in particular region

Increase of concentration of O₃ in tropical region

Decomposition of O₂ to O₃ in sunlight

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

Coagulation

Aeration

Treatment with chlorine

Treatment with Iodine

65. Spraying of DDT produces pollution of

Air, water and soil

Air and water

Air

Air and soil

66. UV radiation bring about

Lung cancer

Skin cancer

Mouth cancer

Liver cancer

67. In fructose the possible optical isomers are

16

12

8

4

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

Varnish

Fiber

Polyester fiber

Plastic

69. Acid rains are produced by

Excess NO₂ and SO₂ from burning fossil fuels

Excess production of NH₃ by industry and coal gas

Excess formation of CO₂ by combustion and animal respiration

Excess release of carbon monoxide by incomplete combustion

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

Electrostatic precipitator

Cyclone separator

Fabric filter

Wet scrubber

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

TiO₂

Tale

Glucose

Starch

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

Additives

Nutrient elements

Basic elements

Trace elements

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

Hg

Pb

NO₂

SO₂

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

Preventing reaction between oxygen and hemoglobin

Destruction of hemoglobin

Forming stable compound with hemoglobin

Combining with oxygen to form carbon dioxide

75. 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 destroy nitrogen oxide from the atmosphere

To help to clean the atmosphere

To help in fixing of bacteria

Page 4 of 9

76. Pollution is

Release of toxic/undesirable materials in environment

Removal of top soil

All the above

Conservation of energy

77. The product of addition polymerization reaction is

Terylene

PVC

Nylon

Polyamide

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

N₂O

CO

N₂

NO

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

Atmosphere

Lithosphere

Hydrosphere

Biosphere

80. Which of the following has ester linkage?

Terylene

Bakelite

PVC

Nylon

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

Smoke

Aerosols

Mists

Fumes

82. Eutrophication causes reduction in

Dissolved hydrogen

Dissolved oxygen

Dissolved salts

All of these

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

Dissolved oxygen increases

pH of water is controlled

Cl₂ kills the pathogenic bacteria

Hardness of water decreases

84. Which of the following is a biodegradable polymer?

Polyethene

Cellulose

Polyvinyl chloride

Nylon-6

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

Peroxy acetyl nitrate

Acrolein

Chlorine nitrate

SO₂ and SO₃

86. Burning of fossil is the main source of pollution

Sulphure dioxide

Nitric oxide

Nitrous oxide

Nitrogen oxide

87. Of the following a step growth polymer

Teflon

Bakelite

PVC

Polyethylene

88. Environmental pollution affects

Biotic and abiotic components of environment

Biotic components

Plants only

Man only

89. Colloidal material in the raw water is removed by

Coagulation

Purification

Chlorination

Combustion

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

Both

Non-renewable

None

Renewable

91. 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

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

Liver worts

Epiphytic lichens

Home worts

Ferns

93. Minamata disease is due to pollution of

Industrial waste containing mercury into fishing water

Organic waste into drinking water

Arsenic into the atmosphere

Oil spill in water

94. Increased asthmatic attacks in certain seasons are related to

Wet and dry environment

Eating of seasonal vegetables

Inhalation of seasonal pollen

Low temperature

95. 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

Branched

Synthetic polymer

Cross linked or inter connected polymer

96. Pick out the wrong statement.

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

Troposhere is a dusty zone containing water vapor and clouds.

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.

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

Boron

Mercury

Fluorine

Chlorine

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

250 to 500°C

500 to 900°C

900 to 1000°C

950 to 1300+C

99. The cause of Minamata disease in the pollution of

Industrial waste Having Hg

Arsenic (As) into atmosphere

Organic waste in drinking H₂O

Oil spills in H₂O

100. The prosthetic group is glycoprotein is

Vitamin

Carbohydrate

Nucleic acid

Fat

Page 5 of 9

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

NO

NO₂

CO₂

SO₂

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

Troposphere

Stratosphere

Thermosphere

Mesosphere

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

Corn straw

Eucalyptus

Fur

Popalr

104. Photochemical smog is caused by

O₃

CO₂

NO₂

CO

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

5 days

6 days

2 day

7 days

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

60

70

80

90

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

Uninfluenced by occurrence of thunderstorm

Slightly lower than that of rain water without thunderstorm

Slightly higher than that when the thunderstorm is not there

Which depends on the amount of dust in air

108. 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

Fluorine is more electronegative than chlorine

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

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

The chlorine atom is larger than the fluorine atom

109. An example of water soluble vitamin is

Vitamin C

Vitamin A

Vitamin E

Vitamin D

110. Lithosphere has amount of silicon

21.13%

27.72%

40.01%

35.30%

111. Glyptal polymer is obtained from glycerol on reacting with

Phthalic acid

Malonic acid

Acetic acid

Maleic acid

112. Soil salinity can be measured by

Potometer

Porometer

Conductivity meter

Calorimeter

113. In human liver, which substance cause cancer

Caron dioxide

Chloroform

H₂SO₃

Methane

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

Sulphure dioxide

Nitrous oxide

Carbon monoxide

Ozone

115. Water pollution is mainly due to

Industrial discharges

Carbon dioxide

Oxygen

Sulphure dioxide

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

Non-renewable

Both

Renewable

None

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

Three

Two

One

Four

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

Carbon monoxide

Oxygen

Methane

Carbon dioxide

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

4

12

8

1

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

Unpredictable

Increases

Decreases

Remains same

121. Shahi Qilla may be destroyed by

All of these

Air pollutants from Lahore chemical industries

Flood in Ravi

Temperature mediated spoilage of marble

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

3

5

4

2

123. Chlorofluorocarbon releases a chemical harmful to ozone

Sulphure dioxide

Chlorine

Fluorine

Nitrogen peroxide

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

Self-oxidation reduction

Aeration

Chlorination

Coagulation

125. BOD is:

Usually less than COD

Biochemical oxygen demand

A measure of the organic matter presents in water

All of these

Page 6 of 9

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

Trophosphere

Stratosphere

Thermosphere

Mesosphere

127. Chromium (VI is used in)

Fertilizer industry

Water purification

Leather tanning

Cement industry

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

250 to 500°C

900 to 100°C

950 to 1300°C

500 to 900°C

129. Bakelite is obtained from phenol by reacting with

Formaldehyde

Acetaldehyde

Acetal

Chlorobenzene

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

10

10000

1000

100

131. Ozone depletion in stratosphere shall result in

Global warming

Forest fires

Increased incidence of skin cancer

None of these

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

Cotton

Wheat

Sugar cane

Paddy rice

133. 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

134. Which of the following is fully fluorinated polymer?

PVC

Teflon

Thiokol

Neoprene

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

Mannose

Fructose

Galactose

Maltose

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

Sodium (I)

Chromium (VI)

Calcium (II)

Chromium (III)

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

Automobile exhausts

Radioactive fall out

Pesticide residue

Household waste

138. Thickness of the atmosphere is

1500 km

500 km

1000 km

100 km

139. Silk is an example of

Animal fiber

Mineral fiber

Vegetable fiber

None of these

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

Cytosine

Adenine

Tryoxine

Guanine

141. Septic tank is:

An aerobic suspended growth biological treatment system

An anaerobic attached growth biological treatment system

An anaerobic suspended growth treatment system

An aerobic attached growth treatment system

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

500 to 900°C

250 to 500°C

900 to 1000°C

950 to 1300°C

143. Atmospheric pollutant is

N₂

CO

CO₂

O₂

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

It reduces the thickness of paper

It dry the paper

It discharge the pulp at the screen of Fourdriner table

Web structure is consolidated

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

Nitrogen oxide

Lead

Sulphur oxide

Mercury

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

Eyes

Ears

Nose

Stomach

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

15 to 20

4 to 5

9 to 10

1 to 2

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

Becoming dirty

Increased shinning

Melting

Harmful stress

149. SO₂ and NO₂ cause pollution due to increase in

Acidity

Buffer action

Neutrality

Basicity

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

Chromium V

Chromium IV

Chromium VI

Chromium III

Page 7 of 9

151. Glucose contains

Four secondary alcoholic group

One – CHO group

One primary alcoholic group

All are correct

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

Glycogen

Starch

Petroleum

Teflon

153. Air pollution is not caused by

Automobiles

Hydroelectric power

Pollen grains

Industries

154. Cracking of polyethene at high temperature gives

Monomers

Allotropes

Polymers

Isomorphs

155. Two vitamins absorbed from intestine along with fats are

D, B

A, B

A, C

A, D

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

Carbon monoxide

Ozone

Sulphur dioxide

Carbon dioxide

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

6.5 kg

4.5 kg

3 kg

1.5 kg

158. 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

Oil leaks and spills

Rain

Livestock waste

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

Aerosols and high flying jets

Balloons and turbo-prop airplanes

Atomic explosions and industrial wastes

Fungicides, insecticides, bactericides and

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

CO pollution

CO₂ Pollution

Acid rain

Ozone depletion

161. Plastics are a pollution problem because many plastics

Decompose to produce toxic products

Burn to produce toxic fumes

Are made from petroleum

Are very inflammable

162. The lowest layer of atmosphere is known as the

None of these

Troposphere

Stratosphere

Ionosphere

163. Which causes water pollution?

Smoke/fly ash

2, 4-D and pesticides

Airplanes

Automobile exhausts

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

Physical properties

Chemical composition

Manufacturing process

All of these

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

Renewable

Non-renewable

None

Both

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

Carbon dioxide

Carbon monoxide

Sulphur oxide

Chlorofluorocarbons and nitrogen oxides

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

Change in taste and odour

Blue baby syndrome

Intestinal irritation

Fluorosis

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

Nylon

Rayon

Dacron

Orlon

169. Which of the following is an air pollutant?

Oxygen

Carbon dioxide

Carbon monoxide

Nitrogen

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

4ppm – 8ppm

2ppm – 3ppm

2ppm – 4ppm

2ppm – 6ppm

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

Non renewable

Renewable

Both

None

172. Calendar stock is process in paper making in which

Paper thickness in reduced

Pulp is spread over fabric or screen

Moisture is removed

Paper is wounded in the form of reel

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

Dissolved oxygen

All of these

Oil

Plastics

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

PMMA

Glyptal

Bunna-S

Neoprene

175. Biodegradable pollutant is

Plastic

Asbestos

Sewage

Mercury

Page 8 of 9

176. All fats are

Hydrocarbons

Esters

Carbohydrates

Aldehydes

177. The pH range of the acid rain is

6-5.6

6.5-6

7-6.5

Less than 5.6

178. Most hazardous metal pollutant of automobile exhaust is:

Copper

Lead

Cadmium

Mercury

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

Tertiary structure

Primary structure

Quaternary structure

Secondary structure

180. Ozone hole refers to

Increase concentration of ozone

Hole in ozone layers

Reduction in thickness of ozone layer in stratosphere

Reduction of thickness of ozone in troposphere

181. Sulphure dioxide affects

Cell wall

Nucleus

All membrane systems

Plasmodesmata

182. Result of ozone hole is

Acid rain

Global warming

UV rays reach the earth

Greenhouse effect

183. Carbon monoxide is pollutant as it

Combines with oxygen

Inactivates nerves

Combines with hemoglobin

Inhibits glycolysis

184. Which substance is used to bleach the pulp?

NaCl

Na₂SO₃

NaOH

NaClO

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

Heat dispersion

None of these

Acid rain

Fossil fuel

186. Cyclone collector is used for minimizing

Radioactive pollution

Air pollution

Water pollution

Noise pollution

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

All of these

Urban and suburban lands

Sewage treatment plants

Factories

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

Increases nitrogen contents of soil

Increases oxygen contents of soil

Acts pesticide

Increases sulphur contents of soil

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

Terylene

Nylon 66

Starch

Bakelite

190. The molecular formula of a trisaccharide will be

C₃H₃O₃

C₃H₆O₃

C₁₈H₃₆O₁₈

C₁₈H₃₂O₁₆

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

Nylon 66

Starch

Glucose

Protein

192. 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

193. Fresh sewage is ____________ in nature

Highly acidic

Alkaline

Acidic

Neutral

194. BOD/COD ratio will always be:

Equal to 1

None of these

More than 1

Less than 1

195. Which statement is incorrect about starch and cellulose?

Both are formed by same type of monomers

Both are polysaccharides

Both can be found in living things

Cellulose is greater in amount on earth as compared to starch

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

50%

2%

10%

1%

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

Acidity

Buffer action

Neutrality

Basicity

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

Copper

Chromium (VI)

Lead

Chromium (III)

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

Plastic toys

PVC

None of these

Epoxy resin

200. Water is often treated with chlorine to

Remove hardness

Increase oxygen content

Remove suspended particles

Kill germs

Page 9 of 9

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

Ozone and dust

SO₂ and NO₂

SO₃ and CO

CO₂ and CO

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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