Question # 1

The morality of the solution containing x grams ammonium sulfate in 500cm3 of the solution is 0.6 what is x?

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39.6

40.5

42.7

45.1

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

Newspaper can be recycled again and again by how many times?

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2

3

4

5

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

Proxy acetyl nitrate (PAN) is an irritant to human beings and it affect

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Nose

Stomach

Eyes

Ears

Chlorofluorocarbon, CF₂Cl₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Coal contains percentage of sulphur:

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1-9%

5-9%

6-9%

7-9%

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

Which of the following factors is not used to determine the quality of water

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COD

BOD

DO

Available chlorine

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from

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2 ppm - 6 ppm

2 ppm - 4 ppm

4 ppm - 8 ppm

2 ppm - 3 ppm

Sulphate aerosols cause severe respiratory problems particularly among

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Infants

Women

Young people

Old people

How much quantity of total water is available as fresh water

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3%

1%

10%

21%

Term ozone hole is used for depletion of ozone during months of:

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

By the mid of 1980s depletion of total overhead ozone in antarctic region is

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20%

30%

40%

50%

Chlorofluorocarbons and aerosols are inert in sphere:

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troposphere

stratosphere

lithosphere

hydrosphere

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

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

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

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Homogeneous

Heterogeneous

Dynamic

Static

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

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