Question # 1

The minimum temperature of troposphere is.

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-2^oC

-56^oC

-100^oC

15^oC

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

Disinfection of water by chlorine is done by the production of.

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NH2Cl

NCl2

HOCl

NHCl2

The pH range of the acid rain is

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7-6-5

6.6-6

6-5.6

less than 5

Ecosystem is a smaller unit of

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lithospher

hydroshper

atmosphere

biosphere

The colloidal particles in raw water can be removed by

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Coagulation

Aeration

Chlorination

Hydration

The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water

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KMnO₄

O₃

Alums

Chloramines

Whcih water will be considered as polluted water.

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High value of COD

Low value of COD

High value of DO

Low value of BOD

Ozone depletion in stratosphere region is mainly due to the reaction of O3 with

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O2

SO2

CFCs

All of these

A single chloride free radical can destroy how many ozone molecules

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100

100,000

100,00

unlimited

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

Ozone is mostly produced in

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Tropical region

North polar region

South polar region

Thermosphere zone of atmosphere

A quality of raw water is improved by

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Reduction

Aeration

Dehydration

Incineration

A single chloride free radical can destroy how many ozone molecules.

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100

100000

10000

10

Water will be considered polluted if it has dissolved oxygen.

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3ppm

4ppm

5ppm

6 ppm

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

Peroxyacetyl nitrate is an irritant to humab beings and it affects

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Eyes

Ears

Stomach

Nose

Thickness of the atmosphere is

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100 km

500 km

1000 km

1500 km

The residence time of NO is

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Few hours

1 day

3 days

4 days

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