Question # 1

Fish die in water bodies polluted by sewage due to.

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Pathogens

Clogging of gills by silt

Reduction in dissolved oxygen

Foul smell

Which of the following statement is not related with the effect of thermal pollution.

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Decrease in BOD

Increase in BOD

Reduction in DO

Change in algal production

Permanent hard water is softened by addition of.

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Na2CO3

CaCO3

MgCO3

ZnCO3

Which of the following statement is not true with respect to hydrocarbons.

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They are gaseous and liquids

They can be saturated or unsaturated

They in air by themselves alone cause harmful effects

They form photochemical oxidants

Which of the following health effect is caused by mercury.

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Nerve damage

Brain damage

Kidney damage

All above

Permanent hardness of water is due to.

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Sulphate of Ca

Chloride of Ca

Sulphate of Mg

All above

Which of the following is renewable energy source.

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Moon

Wind

Sun

Ocean

Which of the following statement represent advantages of sanitary Landfill

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Economical method

Low initial investment

Flexible daily capacity

All above

Which of the following gas form weakly acidic sulphurous acid

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SO2

SO3

NO2

NO

The hardness of water i s due to the presence of dissolved soluble salts of.

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Calcium

Megnesium

Iron

All above

The splitting of H2O can be carried out through

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Photolysis

Electrolysis

Dialysis

Hydrogenation

Disease caused by eating fish found in water contaminated with industrial waste having mercury is.

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Minamata disease

Bright's disease

Hashimoto's disease

Osteoaclerosis

Which of the following chemical strong oxidizing agent is used in COD test.

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KMnO4

H2SO4

CH3COOH

K2Cr2O7

Which of the following techniques are used for minimizing water pollution.

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Stabilization of ecosystem

Recharge of the waste

Waste treatment

All above

Chief source of water and soil pollution in

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Mining of ores

Thermal power plant

Agro industry

All the above

Ozone layer of upper atmosphere is being destroyed by

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chlorofluorocarbons

SO2

Photochemical oxidants O2 and CO2

Smog

Which of the following substances act as pollutant.

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Oils

Greases

Toxins

All above

Which of the following material is a constituent of crop residue.

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Cull

Fruit

vines

Bagasse

All above

Result of ozone hole is.

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Acid rain

Global warming

Increased amount of CO2

Greater exposure of earth to U.V. rays.

Human hearing is sensitive to frequency in the range of about

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10,000 - 20,000 Hz

10 - 10,000 Hz

16- 20,000 Hz

None of the above

Which of the following is renewable resources of energy.

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Hydropower

Wind power

Solar power

All above

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