Question # 1

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these

The disposal of domestic refuse, commercial and industrial solid wastes are studied under the title

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Solid waste management

Waste management

Solid management

Semisolid management

Phenomenon of acid rains gain importance in:

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1930s

1940s

1950s

1960s

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

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2: 1

1: 2

3: 1

4: 1

Troposphere extends upto km:

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0-15 km

10-15 km

15-40 km

Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None of these

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

Which is the most toxic among the given?

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heavy metals

non-metals

Metals

Metalloids

Why a C - Cl bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

Uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

The toxic organic compounds and heavy metals and metalloids results in contamination of

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surface water

ground water

both surface and ground water

neither surface nor ground waters

Water exist in only

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One state

Two state

Three states

4 states

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

The normal amount of overhead ozone is about in DU:

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150

250

350

450

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

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Eyes

Ears

Stomach

Nose

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

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

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Which is not the condition for the formation of smog

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there must be sufficient NO gas

there must be sunlight to help photo chemical reactions to take place

air must be blowing swifty

there must be SO₂in the air

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

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