Question # 1

A gas produced on heating solid potassium chlorate is.

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Hydrogen

Carbon dioxide

Oxygen

Methane

A physical change occurs when.

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Iron rusts

Solution of common salt is heated

A piece of wood burns

Sygar us geated strongly

A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is.

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Iron oxide

Iron sulphide

Iron Chloride

Iron Hydride

Zince oxide is ............... solid substances.

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Red

White

Yellow

Blue

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

During combustion, a substance reacts with

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Hydrogen

Water

Oxygen

Carbon di oxide

The temperature at which a liquid's vapour pressure is equal to the external pressure surrounding the liquid is.

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Melting point

Boiling point

Freezing point

Highest temperature.

What are teh products when electric current is passed through water.

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Only steam

Hydrogen and steam

Hydrogen and oxygen

Oxygen and steam

On heating sugar changes into

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Carbon

Water

Both carbon and water

Heat

Formation of steam from water is example of.

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Chemical change

Physical Change

Both of these

None of these

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Science 7th Class Urdu Medium Chapter 5 Online Test MCQs With Answers

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