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
The burning of wood
  • Can be reversed
  • Cannot be reversed
  • Can be expanded
  • Can be melted
When iron rim is heated it
  • Contracts
  • Expands
  • Dissolves
  • Evaporates
When the iron blade is on the wooden handle it is fitted
  • By heating then cooling
  • By cooling then heating
  • By boiling then cooling
  • By freezing
Burning of a candle is
  • Only a physical change
  • Only a chemical change
  • Both physical and chemical change
  • None of these
Which of the following is an irreversible change that takes place when heat is provided to the system?
  • Melting of ice
  • Transformation of water into steam
  • Burning of coal
  • The expansion of iron
Give a example of physical change
  • kicking a football
  • burning a paper
  • growth of animals and plants
  • cooking
What is a reversible change?
  • a change that cannot be reversed
  • a change that can be reversed
  • I don't know
  • a change where a new substance is formed
What are irreversible changes?
  • A change that cannot be reversed
  • A change that can be reversed
  • I don't know
  • A change in which no new substance are formed
What are physical changes?
  • I don't know
  • a change where no new substance are formed
  • a change where a new substance has formed
  • A new formation of gas
What are chemical changes
  • I don't know
  • a new formation of gas
  • a new formation of substance
  • No new formation of substance
Burning a log is a chemical change
  • true
  • false
Melting of a popsicle is a reversible change
  • true
  • false
Growth of animals and plants
  • chemcial change
  • physical change
  • I don't know
  • Reversible change
Chemical changes are always irreversible
  • true
  • false
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