ECAT Chemistry Environmental Chemistry Test Online

Page 1 of 9

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

Primary structure

Secondary structure

Tertiary structure

Quaternary structure

2. The molecular formula of a trisaccharide will be

C₃H₃O₃

C₁₈H₃₂O₁₆

C₃H₆O₃

C₁₈H₃₆O₁₈

3. In human liver, which substance cause cancer

Methane

H₂SO₃

Chloroform

Caron dioxide

4. 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 to clean the atmosphere

To help plant to undergo photosynthesis

To help in fixing of bacteria

To destroy nitrogen oxide from the atmosphere

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

250 to 500°C

500 to 900°C

900 to 100°C

950 to 1300°C

6. Which causes water pollution?

Airplanes

2, 4-D and pesticides

Automobile exhausts

Smoke/fly ash

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

Pb

SO₂

Hg

NO₂

8. Minamata disease is due to pollution of

Organic waste into drinking water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

Oil spill in water

9. Acid rains are produced by

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

Excess formation of CO₂ by combustion and animal respiration

10. Of the following a step growth polymer

Teflon

Bakelite

PVC

Polyethylene

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

2 day

6 days

5 days

7 days

12. A condensation polymer among the following is

Teflon

Polystyrene

PVC

Dacron

13. The raw material to form nylon is

Isoprene

Ethylene

Adipic acid

Butadiene

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

Ozone and dust

SO₂ and NO₂

SO₃ and CO

CO₂ and CO

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

Fructose

Glucose

Cellulose

Starch

16. Atmospheric pollutant is

N₂

O₂

CO₂

CO

17. Water is often treated with chlorine to

Remove suspended particles

Kill germs

Increase oxygen content

Remove hardness

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

1

4

12

8

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

CO₂ Pollution

CO pollution

Ozone depletion

Acid rain

20. Swage water is purified by

Light

Microorganisms

Aquatic plants

Fishes

21. Ozone hole is maximum over

Antarctica

Africa

Europe

Asia

22. Carbon monoxide is pollutant as it

Combines with oxygen

Inactivates nerves

Combines with hemoglobin

Inhibits glycolysis

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

Flow spreader, pressing, drying, calendar stock

Calendar stock, flow spreader, pressing drying

Flow spreader, Drying, pressing, calendar stock

Calendar stock, Drying, pressing, flow spreader

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

Sugar cane

Wheat

Cotton

Paddy rice

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

Pesticide residue

Automobile exhausts

Household waste

Radio-active fall out

Page 2 of 9

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

Bunna-S

PMMA

Glyptal

Neoprene

27. Smog is:

A combination of smoke and fog

A natural phenomenon

All of these

Is colourless

28. Ozone depletion in stratosphere shall result in

Forest fires

Increased incidence of skin cancer

None of these

Global warming

29. Environmental pollution affects

Man only

Biotic components

Biotic and abiotic components of environment

Plants only

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

Assimilated in the root hairs of plants

Less toxic

Easy to spread in the field

More soluble as compared to smaller crystals

31. Which substance is used to bleach the pulp?

Na₂SO₃

NaCl

NaClO

NaOH

32. Ultraviolet radiation from sun causes a reaction that produces

Ozone

Fluorides

Sulphure dioxide

Carbon monoxide

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

Ears

Eyes

Nose

Stomach

34. SO₂ and NO₂ produce pollution by increasing

Neutrality

Acidity

Alkalinity

Buffer action

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

Chromium (VI)

Lead

Chromium (III)

Copper

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

Increases nitrogen contents of soil

Acts pesticide

Increases sulphur contents of soil

Increases oxygen contents of soil

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

Hydrosphere

Lithosphere

Biosphere

Stratosphere

38. Chlorofluorocarbon releases a chemical harmful to ozone

Fluorine

Chlorine

Sulphure dioxide

Nitrogen peroxide

39. Which of the following has magnesium?

Chlorophyll

Carbonic anhydrase

Vitamin B₁₂

Haemocyanin

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

Trace elements

Nutrient elements

Additives

Basic elements

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

Fungicides, insecticides, bactericides and

Balloons and turbo-prop airplanes

Atomic explosions and industrial wastes

Aerosols and high flying jets

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

Non-renewable

Renewable

None

Both

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

Increased shinning

Becoming dirty

Harmful stress

Melting

44. UV radiation bring about

Skin cancer

Mouth cancer

Liver cancer

Lung cancer

45. Photo chemical smog contains __________ as main reactants.

Nitrons oxide and unburnt hydrocarbons

N₂O and burnt hydrocarbons

Nilric oxide and unburnt hydrocarbons

NO and burnt hydrocarbons

46. Pick out the wrong statement.

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

Troposhere is a dusty zone containing water vapor and clouds.

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

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

47. Septic tank is:

An aerobic attached growth treatment system

An anaerobic attached growth biological treatment system

An anaerobic suspended growth treatment system

An aerobic suspended growth biological treatment system

48. Fresh sewage is ____________ in nature

Acidic

Neutral

Highly acidic

Alkaline

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

Smoke

Mists

Aerosols

Fumes

50. Domestic waste mostly constitutes

Effluents

Air pollution

Biodegradable pollution

Non-biodegradable pollution

Page 3 of 9

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

Thermoplastics

Thermosetting polymers

Elastomers

Fibers

52. Fluoride pollution mainly affects:

Teeth

Brain

Kideny

Heart

53. Shahi Qilla may be destroyed by

Air pollutants from Lahore chemical industries

Flood in Ravi

Temperature mediated spoilage of marble

All of these

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

Nickel Sulphate

Alum

Barium Sulphate

Copper Sulphate

55. 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

56. Keratomalacia is caused due to the deficiency of vitamin

B

D

K

A

57. Classical smog occurs in places of

High temperature

Low temperature

Excess SO₂

Excess NH₃

58. Which of the following is fully fluorinated polymer?

Thiokol

PVC

Neoprene

Teflon

59. Nutrient leach is due to

Combustion of soil

Acidification of soil

Drying of soil

Neutralization of soil

60. The product of addition polymerization reaction is

Terylene

PVC

Nylon

Polyamide

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

900 to 1000°C

500 to 900°C

250 to 500°C

950 to 1300+C

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

All of the above

Sewage treatment plant

Thermal power plant

Solid waste disposal sites

63. The cause of Minamata disease in the pollution of

Oil spills in H₂O

Arsenic (As) into atmosphere

Organic waste in drinking H₂O

Industrial waste Having Hg

64. Vegetables oils are

Essential oils obtained from plants

Glycerides of saturated fatty acids

Unsaturated fatty acids

Glycerides of unsaturated fatty acids

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

Starch

Glucose

Protein

Nylon 66

66. Glyptal polymer is obtained from glycerol on reacting with

Phthalic acid

Malonic acid

Acetic acid

Maleic acid

67. Lithosphere has amount of silicon

35.30%

27.72%

40.01%

21.13%

68. BOD is:

Biochemical oxygen demand

A measure of the organic matter presents in water

All of these

Usually less than COD

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

ClO₂

Cl₂

Both b & c

C₃

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

Nitrous oxide

Sulphure dioxide

Carbon monoxide

Ozone

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

950 to 1300°C

250 to 500°C

500 to 900°C

900 to 1000°C

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

Mesosphere

Stratosphere

Trophosphere

Thermosphere

73. Which one is the most toxie?

Carbon

CO

SO₂

CO₂

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

CO

N₂

NH₃

H₂

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

5

2

4

3

Page 4 of 9

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

Ferns

Home worts

Epiphytic lichens

Liver worts

77. The metal present in blood is

Hg

Al

Cu

Fe

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

Chlorine nitrate

Acrolein

SO₂ and SO₃

Peroxy acetyl nitrate

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

Bakelite

Nylon 66

Terylene

Starch

80. BOD is

Biosphere oxygen demand

Biological oxygen demand

Biological oxygen deficit

None of these

81. Which one of the following is not a pollutant

SO₂

CO₂

NO₂

CO

82. The pH range of the acid rain is

7-6.5

Less than 5.6

6.5-6

6-5.6

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

Electrostatic precipitator

Fabric filter

Cyclone separator

Wet scrubber

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

All of these

Plastics

Oil

Dissolved oxygen

85. Which of the following has ester linkage?

Nylon

Bakelite

Terylene

PVC

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

Neutrality

Buffer action

Acidity

Basicity

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

Shortage of food

Clean drinking water

Growing population

Unemployment

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

Renewable

None

Both

Non-renewable

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

1 to 2

9 to 10

15 to 20

4 to 5

90. Calendar stock is process in paper making in which

Paper is wounded in the form of reel

Moisture is removed

Pulp is spread over fabric or screen

Paper thickness in reduced

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

Ozone

Smog

Acid rain

Global warming

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

O₃

Alums

KMnO₄

Chloramines

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

Plastic toys

None of these

PVC

Epoxy resin

94. Cyclone collector is used for minimizing

Water pollution

Noise pollution

Air pollution

Radioactive pollution

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

SO₂

CO₂

NO₂

NO

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

It discharge the pulp at the screen of Fourdriner table

Web structure is consolidated

It reduces the thickness of paper

It dry the paper

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

1.5 kg

3 kg

6.5 kg

4.5 kg

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

Petroleum

Starch

Glycogen

Teflon

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

Combining with oxygen to form carbon dioxide

Preventing reaction between oxygen and hemoglobin

Destruction of hemoglobin

Forming stable compound with hemoglobin

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

Mechanical beating of fibers

Pressed to remove moisture

Pulp is dispersed in water and slurry is obtained

Addition of chemical additives

Page 5 of 9

101. The lowest layer of atmosphere is known as the

Ionosphere

Troposphere

Stratosphere

None of these

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

Polyhalogens

Freons

Ferrocene

Fullerenes

103. BOD/COD ratio will always be:

Less than 1

More than 1

Equal to 1

None of these

104. 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

105. In fructose the possible optical isomers are

16

4

8

12

106. Denaturing of protein is:

Hydrolysis of protein

Developing hydrogen bonding in peptide chain

Three dimensional twisting and folding of peptide chain

Unfolding of protein

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

Keeping pH 7.35

Oxidizing agent

pH changes

Heat protein

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

Atmosphere

Lithosphere

Biosphere

Hydrosphere

109. All fats are

Aldehydes

Esters

Hydrocarbons

Carbohydrates

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

None of these

Fossil fuel

Heat dispersion

Acid rain

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

Chromium (VI)

Chromium (III)

Sodium (I)

Calcium (II)

112. Photochemical smog is caused by

CO₂

O₃

CO

NO₂

113. Increased asthmatic attacks in certain seasons are related to

Inhalation of seasonal pollen

Wet and dry environment

Eating of seasonal vegetables

Low temperature

114. Which one is not a pollutant normally?

Sulphur dioxide

Carbon dioxide

Carbon monoxide

Hydrocarbons

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

Sulphur dioxide

Photochemical oxidants

Smog

Chlorofluorocarbon

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

Blue baby syndrome

Change in taste and odour

Fluorosis

Intestinal irritation

117. Cracking of polyethene at high temperature gives

Polymers

Isomorphs

Monomers

Allotropes

118. Which of the following is a biodegradable polymer?

Cellulose

Nylon-6

Polyethene

Polyvinyl chloride

119. Pollution is

All the above

Conservation of energy

Removal of top soil

Release of toxic/undesirable materials in environment

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

Lead

Mercury

Sulphur oxide

Nitrogen oxide

121. Sulphure dioxide affects

Cell wall

Nucleus

All membrane systems

Plasmodesmata

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

Wheat field

Paddy field

Cotton field

Can sugar field

123. Soil salinity can be measured by

Potometer

Calorimeter

Conductivity meter

Porometer

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

Chemical composition

All of these

Manufacturing process

Physical properties

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

Mannose

Fructose

Maltose

Galactose

Page 6 of 9

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

Factories

All of these

Sewage treatment plants

Urban and suburban lands

127. 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

128. An example of water soluble vitamin is

Vitamin D

Vitamin A

Vitamin E

Vitamin C

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

Plastic

Varnish

Fiber

Polyester fiber

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

Corn straw

Popalr

Fur

Eucalyptus

131. 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

132. The prosthetic group is glycoprotein is

Vitamin

Fat

Carbohydrate

Nucleic acid

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

Cl₂ kills the pathogenic bacteria

Dissolved oxygen increases

Hardness of water decreases

pH of water is controlled

134. The combination of smoke and fog is called

Primary pollutant

Secondary pollutant

Smog

Coagulation

135. 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?

Branched

Linear polymer

Synthetic polymer

Cross linked or inter connected polymer

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

Starch

TiO₂

Glucose

Tale

137. Eutrophication causes reduction in

Dissolved hydrogen

Dissolved salts

All of these

Dissolved oxygen

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

2ppm – 3ppm

4ppm – 8ppm

2ppm – 4ppm

2ppm – 6ppm

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

Benzene

Ethene

Phenol

Methane

140. Result of ozone hole is

Global warming

Greenhouse effect

Acid rain

UV rays reach the earth

141. Bakelite is obtained from phenol by reacting with

Acetal

Chlorobenzene

Acetaldehyde

Formaldehyde

142. SO₂ and NO₂ cause pollution due to increase in

Basicity

Acidity

Neutrality

Buffer action

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

Chlorofluorocarbons and nitrogen oxides

Sulphur oxide

Carbon dioxide

Carbon monoxide

144. Air pollution is not caused by

Industries

Pollen grains

Hydroelectric power

Automobiles

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

Increases

Remains same

Decreases

Unpredictable

146. Water pollution is mainly due to

Industrial discharges

Sulphure dioxide

Oxygen

Carbon dioxide

147. Plastics are a pollution problem because many plastics

Are made from petroleum

Decompose to produce toxic products

Burn to produce toxic fumes

Are very inflammable

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

Sulphate ion (SO₄²¯)

Permanganate ion (MnO₄)

Chromate ion (CrO₄²¯)

Dichromate ion (Cr₂O₇²¯)

149. Potable water is considered to be

Now safe or human consumption

Safe for human consumption

The Surface water

The ground water

150. Which of the following is an air pollutant?

Oxygen

Carbon dioxide

Nitrogen

Carbon monoxide

Page 7 of 9

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

Coagulation

Aeration

Self-oxidation reduction

Chlorination

152. Chief source of water and soil pollution is

Mining

All the above

Thermal power plant

Agro-industry

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

Heteropolymer

Homopolymer

Terpolymer

Copolymer

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

Mesosphere

Stratosphere

Thermosphere

Troposphere

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

Ascorbic acid

Trypsin

Niacin

Riboflavin

156. Colloidal material in the raw water is removed by

Purification

Coagulation

Combustion

Chlorination

157. Depletion of ozone layer is due to

None of these

Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

158. Cyclone collector is used to reduce

Air pollution

Noise pollution

Water pollution

Radioactive pollution

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

Urbanization

Increase of plantation

Industrialization

Rapid growth of population

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

Carbon dioxide

Nitrogen oxides and chloro fluorocarbon

Sulphure dioxide

161. Thickness of the atmosphere is

1000 km

1500 km

100 km

500 km

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

Three

Two

One

Four

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

Both

None

Renewable

Non-renewable

164. Pick up the correct statement

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

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

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

Chromium VI

Chromium III

Chromium V

Chromium IV

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

60

80

70

90

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

5

2

4

3

168. Polymer formation from monomers starts by

Conversion of monomer to monomer ions by protons

Coordination reaction between monomers

Condensation reaction between monomers

Hydrolysis of monomers

169. Spraying of DDT produces pollution of

Air and soil

Air and water

Air, water and soil

Air

170. Two vitamins absorbed from intestine along with fats are

D, B

A, C

A, B

A, D

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

Oxygen

Carbon dioxide

Carbon monoxide

Methane

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

Dacron

Orlon

Nylon

Rayon

173. Ozone hole refers to

Increase concentration of ozone

Reduction of thickness of ozone in troposphere

Reduction in thickness of ozone layer in stratosphere

Hole in ozone layers

174. Glucose contains

All are correct

One – CHO group

Four secondary alcoholic group

One primary alcoholic group

175. Fungicides are the pesticides which

Kill insects

Kill plants

Control the growth of fungus

Kill herbs

Page 8 of 9

176. Carbon monoxide is harmful to human beings as it

Is destructive to O₃

Is antagonistic to CO₂

Has higher affinity for hemoglobin as compared to oxygen

Is carcinogenic

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

100

1000

10000

10

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

CO

N₂O

N₂

NO

179. Most hazardous metal pollutant of automobile exhaust is:

Lead

Mercury

Copper

Cadmium

180. Phosphate pollution is caused by

Agricultural fertilizers

Sewage and agricultural fertilizers

Phosphate rocks and sewage

Weathering of phosphate rocks only

181. On hydrolysis sucrose gives

Fructose and maltose

Glucose and fructose

Glucose and maltose

Fructose and lactose

182. Burning of fossil is the main source of pollution

Nitric oxide

Nitrous oxide

Sulphure dioxide

Nitrogen oxide

183. Silk is an example of

Vegetable fiber

Animal fiber

Mineral fiber

None of these

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

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

Uninfluenced by occurrence of thunderstorm

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

Ozone

Carbon monoxide

Carbon dioxide

Sulphur dioxide

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

Polyurea

Polyester

Polyurethane

Polystyrene

187. 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

All are correct

Drink dilute solution of CH₃COOH

Drink dilute solution of NaHCO₃

188. Biodegradable pollutant is

Plastic

Mercury

Sewage

Asbestos

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

Pesticide residue

Radioactive fall out

Automobile exhausts

Household waste

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

Tryoxine

Cytosine

Adenine

Guanine

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

Treatment with chlorine

Treatment with Iodine

Aeration

Coagulation

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

Explosion

Undesirable plant growth

Non-biodegradable foam

Corrosion

193. B.O.D. is connected with

None of these

Microbes and organic matter

Organic matter

Microbes

194. Drained sewage has B.OD.

Equal to that of water

None of these

More than that of water

Less than that of water

195. 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

196. Drawback DDT as pesticide is

It becomes ineffective after some time

Its high cost

It is less effective than others

It is not easily/rapidly degraded on nature

197. 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?

Rain

Disposal of industrial effluents

Livestock waste

Oil leaks and spills

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

None

Non renewable

Renewable

Both

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

1%

2%

10%

50%

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

Mercury

Chlorine

Fluorine

Boron

Page 9 of 9

201. Chromium (VI is used in)

Leather tanning

Cement industry

Water purification

Fertilizer industry

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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