Changes around us

What type of change is the bursting of a cracker ?

• Reversible change

• Irreversible change

• Physical change

• None of these

What type of change is the lighting of a bulb?

• Reversible change

• Irreversible change

• Chemical change

• None of these

Which of the following is a reversible change?

• Rusting of iron

• Hearing of iron

• Baking of roti

• Grinding of wheat in flour

Which of the following is an example of an irreversible change that takes place when heat is supplied?

• Melting of ice

• Transformation of water into vapour

• Burning of coal

• The expansion of iron

What type of changes are the blowing of balloon and it's bursting?

• Both the changes are reversible

• Reversible and irreversible .

• Both the changes are irreversible

• Irreversible and reversible

Which of the following is an irreversible change and does not require any heat?

• Melting of wax

• Roasting chappati

• Burning of coal

• Breaking glass bowl

Which of the following is an irreversible change?

• Filling air in a balloon

• Melting of ice

• Burning of paper

• Making a toy aeroplane by folding paper

Which type of change is the curdling of milk?

• Reversible change

• Irreversible change

• Reversible as well as irreversible change

• None of these

Which of the following changes takes place when heat is given?

• The bursting of a balloon due to filling of excess air

• Crushing of coal pieces

• Transformation of water into vapour

• Dissolving of salt in water

Which of the following changes takes when some other substance is mixed with the given substance?

• Heating of iron

• The grinding of wheat into flour

• Curdling of milk

• Folding a paper to make a paper boat