Chapter - 6 || Changes around us

In general, on heating metals

• Contract

• Expand

• Can expand or contract

• None of these

When object is cooled, it's size

• Increases

• Decreases

• Remains same

• None of the above

The burning of wood

• Can be reversed

• Cannot be reversed

• Can be expanded

• Can be melted

Which one of the following is a reversible change

• Tearing of paper

• Blowing air in a balloon

• Breaking of stick

• Baked chapati

A change that occurs during a definite time interval is known as _________

Evaporation of water is a reversible change

• True

• False

Rusting of iron is a reversible change

• True

• False

The process where, water changes to vapour after heating

• Melting

• Contraction

• Evaporation

• Condensation

When iron is heated it

• Contracts

• Expands

• Dissolves

• Evaporates

Burning of a candle is _______

• Only a physical change

• Only a chemical change

• Both physical and chemical change

• None of these