Question # 1

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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low value

higher value

both values

none of these

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

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10,000

20,000

100,000

50,000

As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:

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10 isomers

3 isomers

5 isomers

6 isomers

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

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

Biochemical oxygen demand is the capacity of organic matter in natural water to consume oxygen

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2 days

5 days

6 days

7 days

Elements in lithosphere exist generally as:

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metals

non-metals

metalloids

minerals

Property due to which water acts as a universal solvent is

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Polarity

It's ability to make hydrogen bond

Both A and B

Strong dipole dipole interaction

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these

Choose the correct statements

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SO₂affects the nucleus

SO₂affects plasmodesmata

SO₂affects cell wall

SO₂affects all membrane systems

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

The eleventh concentration of metal cause clogs of gills in fish:

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Al

He

Pb

Ca

Water in swimming pools is purified by adding

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Sodium

Chlorine

Phosphorus

Potassium

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

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Stratosphere

Hydrosphere

Lithosphere

Biosphere

0.1M HCI having pH =1.0 it is about 100 time stronger than acetic acid what will be the pH of acetic acid:

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0.1

1.3

2

3

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

Lead pollution is mainly due to

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Metallic pollution

Space pollution

Acid rain

Cd pollution

DDT is a:

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Fungicide

Insecticide

Herbicide

All

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