Question # 1

The sphere just above the Earth's surface is.

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Mescosphere

Stratosphere

Thermosphere

Troposphere

Which one is not a characteristic of an acid:

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it turns red litmus blue

it reacts with base to form salt and water

Its aqueous solution conduct electric current

it has sour taste

Cholera is caused by

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Protozoa

Virus

Bacteria

Fungi

Conversion of dead plants into coal by the action of bacteria and heat is called.

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Carbonization

Catenation

Hydrogenation

Cracking

Chalco-Pyrite is an ore of:

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Copper

Silver

Iron

Aluminium

About 99% atmosphere's lies within:

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30 kilometre

35 kilometre

15kilometre

11 kilometre

Which one of the following is crystalline solid.

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Glucose

Starch

Cellulose

Glycogen

Percentage of nitrogen in atmosphere is:

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20.94%

78.09%

0.93%

0.03%

Which one of the following is not a greenhouse Effect?

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Increasing atmosphere temperature.

Increasing food chains

increasing flood risks

Increasing sea-level

Formic acid is present in

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String of bees

Sour milk

Apple

Fats

Volatility of hydrocarbons deceases with:

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decrease of molecular mass

increase of molecular mass

increase of double or triple bonds

decrease of triple bonds

The freezing point of water is:

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10 ^oC

100^oC

0^oC

46^oC

Almost all aircrafts fly in:

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troposphere

mesosphere

stratosphere

themosphere

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