Changes around us-Grade 6

Choose the incorrect statement.

• Change of bud into flower cannot be reversed

• Inflating of tyre is a reversible change

• Burning of a paper is an irreversible change

• Burning of wood is an irreversible change

An iron ring is heated . Which of the following statement about it is incorrect ?

• The ring expands .

• The ring almost comes to the same size on cooling .

• The change in this case is reversed .

• The ring changes its shape and the change cannot be reversed

Changes in which heat is liberated are called-

• Exothermic changes

• ·

  Endothermic changes

• Rapid changes

• None of these

Choose the incorrect statement related to reversible change.

• Water can be converted into vapours and vice versa.

• Ice can be converted to water and vice versa

• Milk is converted to curd and vice versa

• Balloon filled with air can be brought back to almost same shape

Which of these is correct

• Boiling of rice is a physical change

• Water vapour into water is a chemical change

• Baking cake in an oven is a physical change

• Change of a bud into a flower is a change which cannot be reversed

Germination of a seed is a ___________ change.

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

Evaporation of water is a reversible change.------(True or false)

Rusting of iron is a reversible change.

Breaking of a China dish is a chemical change. …………….