Question # 1

------------- in mouth has antiseptic property and kills microogansms in food.

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Tongue

Teeth

Saliva

Trachea

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

On heating sugar changes into

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Carbon

Water

Both carbon and water

Heat

The particle of an atom having negative charge on it.

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Electron

Proton

Neutron

Nucleus

The contraction of the objects on cooling is due to.

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Reduction in size of the particles

Increase in size of the particles

Increase in inter particles distances

Decrease in inter particle distances

During combustion, a substance reacts with

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Hydrogen

Water

Oxygen

Carbon di oxide

The weight of an object in Earth's gravitaional field depends on.

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Mass of the object

Acceleration due to gravity

Both a and b

None of these

The rise of liquid in the thermomeer is due to.

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Evaporation

Contraction

Expansion

Sublimation

Components of binary solutions are.

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1

2

3

4

The degreee of hotness or coldness is called.

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Thermal contrction

Heat

Thermal Expansion

Temperature

Sound cannot pass through.

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Solid

Liquid

Vacuum

Gasses

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