Question # 1

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

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

Product fo combustion is.

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C

O2

CO2

All of these

Sajeet the one that is different from the otehrs.

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Solubility

Conductance

Oxidation

Coiling of a substance

What happens to water on heating.

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Evaporates

Condense

Freez

None of these

Chemical reaction of oxygen with other substances is called.

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Oxidation

Reduction

Rusting

None of these

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

Compustion is a.

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Physical Change

Chemical change

Thermal change

None of these

On heating sugar changes into

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Carbon

Water

Both carbon and water

Heat

Select all that happen during a chemicla change.

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A temporary chagne occurs.

Composition of the substanes is changed.

Propertis of the sbstances are changed.

New substances with different properties are formed.

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

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