Question # 1

Which of the following human activities are contaminating surface and ground waters?

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pesticides

septic ranks

petroleum and natural gas production

all of these

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

The Catalyst used in the contact tower for the manufacture of H₂SO₄ is easily poisoned by:

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Nitrous oxide

Nitrogen gas

Arsenic oxide

Carbon dioxide

alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium.

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sulphates

oxides

hydroxides

chlorides

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

Which one of the following is not a component of environment

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Biosphere

Stratosphere

Hydrosphere

Lithosphere

BOD means

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Boron oxygen deuterium

Biochemical oxygen demand

Biochemical oxygen dissolved

Biochemical oxygen death

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 pH range of the acid rain is

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6.5 - 6

Less than 5

8 - 7.5

7 - 6.5

CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC

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CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

Surface and ground water sources are contaminated by various human activities which of the followings is not a human activity that causes contamination in fresh water

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live stock waste

oil leaks and spills

disposal of industrial effluents

rain

Chemical equilibrium involving reactants and products in more than one phase is called:

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Homogeneous

Heterogeneous

Dynamic

Static

Site of land for landfill is selected based upon.

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topography

location of ground

water table

All of these

The branch of chemistry interlinked with biology, physics, medicines, agriculture, public health and sanitary engineering etc. is:

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Biochemistry

Physical chemistry

Pharmaceutical chemistry

Environmental chemistry

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

Primary pollutants are:

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oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

Which gas produces air pollution?

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oxides of sulphur

oxides of carbon

all of these

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

The semi solid wastes in landfills is called:

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Landfill

effluents

Leachate

Incineration

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