Which of the following changes can be reversed?
  • Raw egg to boiled egg
  • Wet clothes to dry clothes
  • Bud to flower
  • Cow dung to biogas
Which of the following changes cannot be reversed?
  • Milk to paneer
  • Cold milk to hot milk
  • Yam to knitted sweater
  • Wet clothes to dry clothes
Metal rim is fixed to the wooden cart wheel by
  • heating metal rim
  • heating wooden wheel
  • cooling metal rim
  • cooling wooden wheel
On heating metal rim
  • expands
  • contracts
  • depends how much it is heated
  • depends as the type of meted
Which one of the steps while burning a candle is not reversible?
  • Melting of solid wax
  • liquid wax changes into vapours
  • Wax vapour bums into flame
  • All of these
Which is a way to make a change happen?
  • Heating a substance
  • Cooling a substance
  • Mixing a substance with another substance
  • All of these
Rusting of iron is an example of
  • slow change
  • fast change
  • reversible change
  • physical change
Conversion of a solid to liquid by heating is called
  • evaporation
  • melting
  • condensation
  • freezing
Which of the following is not a man-made change?
  • Change of day and night
  • Burning of fuels
  • Drying of clothes
  • Tearing of paper
Which of the following is a chemical change?
  • Evaporation of water
  • Burning of fuels
  • Moving of a wheel
  • Breaking of a brick
Chemical change is
  • Melting of wax
  • Ice to water
  • Burning of paper
  • freezing of water
Pick the change that can be reversed from the following
  • Cutting of trees
  • Melting of ghee
  • Burning of candle
  • Blooming of flower
Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim
  • expands and fits onto the wooden wheel
  • contracts and fits onto the wooden wheel
  • no change in the size takes place
  • expands first, then on cooling contracts and fits onto the wooden wheel.
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
Rolling of chapati and baking of chapati are the changes that
  • can be reversed.
  • cannot be reversed.
  • can be reversed and cannot be reversed, respectively.
  • cannot be reversed and can be reversed, respectively
A process in which a solid melt to become a liquid on heating is called ______
  • boiling
  • evaporation
  • melting
  • expansion
irreversible change
  • Melting of butter and chocolate
  • burning of paper
  • rolling of chapati from the dough
  • freezing of water
______ changes are the changes in which __________________ properties of a substance change, and a new substance is formed
  • Chemical
  • physical
  • reversible
  • none of these
Changes that leads to the formation of a completely new substance is
  • physical change
  • chemical change
  • both a& b
  • none
Boiling of rice is a
  • physical change
  • chemical change
  • periodical change
  • reversible change
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