Question # 1

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will not cause water pollution

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live stock waste

agricultural pesticides

oil beaks and spills

all of the above

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

Hydrocarbons, SO₂, CO, NH₃nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

The 95.5% mass of Lithoshone is made of 11 elements i,e O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. Which element is present in trace amount

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iodine

bromine

lead

carbon

Ozone layer is

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25 - 28 km high

26 - 29 km high

24 - 27 km high

20 - 28 km high

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

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

Poisoning of CO can be reveresed by giving oxygen at pressure:

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low

least

medium

High

In big/metropolitan cities, atmosphere is mostly polluted due to

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

Fresh water of total earth water is:

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1%

2%

3%

4%

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Water cover earth surface more than:

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50%

60%

70%

80%

Sulphate aerosols cause severe respiratory problems particularly among

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Infants

Women

Young people

Old people

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

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

The gases in the atmosphere are essential for sustaining life on earth. Thus oxygen is required for breathing. What for is carbon dioxide required

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To help plant to under go photosynthesis

To destroy nitrogen oxide from the atmosphere

To help to clean the atmosphere

To help in fixing of bacteria

Polar ice caps can melt due to

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Acid rain

Green House Effect

Smog

Chlorofluorocarbons

Chose a point which is not included in the components of environment

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Stratosphere

Hydrosphere

Lithosphere

Biosphere

Electropositive character increases down the groups due to:

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Increase in atomic size of the elements

Decrease in ionization potential

Decreases in electromagnetically of the element

All the above

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