Question # 1

Which gas protects the Earth's surface from ultraviolet radiations?

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CO₂

CO

N₂

O₃

The waste products driven out because of the combustion of fossil fuels.

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Primary pollutant

Secondary pollutant

Tertiary pollutant.

None of them

Which gas is not present in atmosphere?

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Nitrogen

Oxygen

Helium

Carbon dioxide

Blast furnace usually used for the metallurgy of.

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Iron

Copper

Aluminum

Both a and b

General formula of Alkynes is.

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C₆H_2n-2

C_nH_2n+2

C₁₁H_2n-2

C_nH_2n-2

The surface tension of water is:

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very low

moderate

high

zero

General formula of Alkyl radical is..

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C₆H_2n-2

C_nH_2n+2

C₁₁H_2n-1

C_nH_2n-2

When crude oil is heated in the fractionating tower:

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Vapour of higher boiling point fraction condense first in the lower part of the tower.

Vapours of lower boiling point fraction condense first in the lower part of tower.

Vapour of higher boiling point condense lather in the upper part of tower.

Vapours of higher boiling point never condense.

About 99% atmosphere's lies within:

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30 kilometre

35 kilometre

15kilometre

11 kilometre

Monosaccharides consist of:

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2 to 6 carbon atoms

3 to 9 carbon atoms

4 to 10 carbon atoms

10 to 15 carbon atoms

The source of galactose.

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Fruits

Vegetables

Cereals

All of them

Vitamin are accessory Growth factors they play important role in our body like.

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Provide energy to the body.

Insulate our body from electric shock

Build brain cells

Regulate metabolism

The boiling point of water is.

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100^oC

4^oC

0^oC

25^oC

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