Physical and Chemical changes

Snow melts and becomes liquid which on evaporation turns into _____.

• solid

• gas

• water

• solid ice

Which property is related to physical change?

• Temporary

• Irreversible

• Permanent

• New substance is formed

Which of the following is a physical change?

• Unflatten the balloon

• Changing shapes of clay

• Cutting tree into blocks

• All of these

Burning of fireworks is a change which is

• reversible

• irreversible

• both (1) & (2)

• natural change

What is a reversible change?

• Something you can change back

• Something you cannot change back

• Something will be constant

• All of these

Rotting of fruit is _____.

• physical change

• reversible change

• chemical change

• both (1) and (2)

Curdling of milk is an example of____.

• physical change

• reversible change

• chemical change

• none of these

Which of the following is an example of chemical change?

• Glowing of an electric bulb

• Magnetisation of a bar of steel

• Grinding a fruit to pulp

• Respiration in living beings

Which of the following may accompany a chemical change?

• Sound may be produced

• A new smell may be given off

• A colour change may take place

• All of these

Animal dung is digested to produce biogas (process A). The biogas is used in stove as a fuel (process B), which of the following is correct?

• Process 'A' is a chemical change

• Process 'B' is a chemical change

• Both 'A' and 'B' are chemical changes

• None of these