Question # 1

The envelope of different gases around the earth is called.

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Atmosphere

Brosphere

Lithosphere

Hydrosphere

Pitch is black residue of

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Coke

Coal-tar

Coal

Coal gas

Just above the Earth's surface is

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Mesosphere

Stratosphere

Theremosphere

Troposphere

Iron and steel structure are damaged by.

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Carbon monoxide

Sulphur dioxide

Methane

Carbon dioxide

A substance which can behave as an acid as well as a base is called.

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Acid

Base

Amphoteric

Neutral

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

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CO₂

CO

N₂

O₃

Petroleum is refined by

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Destructive distillation

Fractional distillation

Simple distillations

Dry distillation

Ozone id beneficial for us as it:

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absorbs infrared radiations

absorbs ultraviolet radiation

absorbs chlorofluorocarbons

absorbs air pollutants

Which of the following is a poisonous gas.

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Oxygen

Ozone

Nitrogen

Carbon dioxide

Lipids are macromolecules. They have characteristics except one of the following.

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They are high energy foods.

They are soluble in water.

They are poor conductor of heat.

They are esters of fatty acids.

Compound of metal exist under earth crust are called.

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Ore

Gangue

Minral

None of these

At equilibrium state, when reaction cases to proceed, it is called:

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equilibrium constant

dynamic equilibrium

static equilibrium

simple equilibrium

The boiling point of water is.

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100^oC

4^oC

0^oC

25^oC

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