Question # 1

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

Water in swimming pools is purified by adding

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Sodium

Chlorine

Phosphorus

Potassium

Fungicides are the pesticides which:

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Control the growth of fungus

Kills insects

Kills plants

Kill herb

Pathogens in raw water are killed in step:

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aeration

coagulation

chlorination

treatment

The yellow color present in the photo chemical smog is due to presence of the

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Carbon dioxide

Nitrogen dioxide

Chlorine

All

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

COD of water can be measured by

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Cr₂O₃

Cr₂O₄^-2ions

Cr₂O₇^-2ions

None of these

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Which is not an air pollutant

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N₂

CO

NO

N₂O

Which is the following is true about galvanic cell:

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Reduction occurs at cathode

Reduction occurs at anode

Anode is negatively charged

Chathode is positively charged

A large hole in the ozone layer over antarctica region was discovered in:

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1960s

1970s

1980s

1990s

Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil

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diffusion

convection

electrophoresis

chromatography

The destructive distillation of coal gives three products. which of following is not the product of destructive distillation of coal?

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Coal tar

CO₂

Coal gas

Coke

The words smog is a combination of smoke and:

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fog

foke

fork

fizzy

Which not a method for solid waste management>

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Landfill

Incinerating

Recycling

None of these

The pH range of the acid rain is

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6.5 - 6

Less than 5

8 - 7.5

7 - 6.5

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

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2 day

6 day

5 day

7 day

Which of the following is not a secondary pollutant

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Ozone

Carbonic acid

Sulphuric acid

Carbon dioxide

The percentage of SO₂ produced by volcanoes is:

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47%

57%

67%

77%

Rigid rocky crust earth upto a depth of 100 km is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

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