Question # 1

Oxygen and nitrogen react to form.

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Nitric Acid

Nitrogen oxide

Nitrogen peroxide

Nitrate

It is not crystalline form of carbon

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charcoal

graphite

buckyballs

diamond

The process which increases the amount of carbon dioxide in air is called

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photosynthesis

respiration

oxidation

vaporization

The process which increases the temperature in the temperatureis called

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Photosynthesis

Oxidation

Greenhouse effect

Evaporation

Each day a normal man breathe............ litres of air.

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20,000 to 15,000

10,000 to 15,000

15,000 to 20,000

21,000, to 31,000

Low iodine availability in humans causes the disease

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Goiter

Cancer

Tuberculosis

Cholera

The process which loops the amount of nitrogen constant in air is

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nitrogen fixation

nitrogen cycle

oxidation

photosynthesis

One of the essential part of all living things on the earth

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carbon

nitrogen

hydrogen

oxygen

The body of a young boy contains approximately... litres of water.

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10

25

35

45

The contents of sodium in leaf tissus vary from.

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0.01 - 10%

10-15%

12-16 %

It is an organic compound

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natural gas

ammonium

water

sodium chlorides

If a key is stiff in a lock, rub the end of the key a soft pencil, which types of elements we obtain.

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Graphite

Silver

Gold

Paltinum

Teh process of converting atompspheric nitrogen to useable from is called.

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Nitrogen cycle.

Carbon cycle

Nitrogen fixation

Water cycle

The percentage of nitrogen in air is

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76%

77%

78%

79%

What type of liquid has abnormal freezing and boiling point.

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Water

Juice

Petrol

Diesel

Ice floats on the surface of water due to.

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Higher density

Lower density

Normal density

Very High density

Nitrogen occur in the atmosphere as................. molecules.

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Triatomic

Diatomic

Polyatomic

None of these

The density of ice at o°C is & nbsp

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0.918g/cm3

0.618g/cm3

0.718g/cm3

0.8/8 g/cm3

The process by which green plants manufacture their food is

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respiration

photosynthesis

oxidation

nitrogen fixation

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