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Class 6 Science
Changes Around Us
Quiz 1
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Which of the following changes can be reversed?
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Raw egg to boiled egg
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Wet clothes to dry clothes
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Bud to flower
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Cow dung to biogas
Explanation
Wet clothes to dry clothes
Which of the following changes cannot be reversed?
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Milk to paneer
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Cold milk to hot milk
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Yam to knitted sweater
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Wet clothes to dry clothes
Explanation
Milk to paneer
Metal rim is fixed to the wooden cart wheel by
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heating metal rim
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heating wooden wheel
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cooling metal rim
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cooling wooden wheel
Explanation
heating metal rim
On heating metal rim
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expands
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contracts
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depends how much it is heated
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depends as the type of meted
Explanation
expands
Which one of the steps while burning a candle is not reversible?
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Melting of solid wax
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liquid wax changes into vapours
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Wax vapour bums into flame
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All of these
Explanation
Wax vapour bums into flame
Which is a way to make a change happen?
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Heating a substance
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Cooling a substance
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Mixing a substance with another substance
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All of these
Explanation
All of these
Rusting of iron is an example of
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slow change
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fast change
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reversible change
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physical change
Conversion of a solid to liquid by heating is called
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evaporation
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melting
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condensation
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freezing
Explanation
melting
Which of the following is not a man-made change?
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Change of day and night
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Burning of fuels
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Drying of clothes
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Tearing of paper
Explanation
Change of day and night
Which of the following is a chemical change?
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Evaporation of water
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Burning of fuels
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Moving of a wheel
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Breaking of a brick
Explanation
Burning of fuels
Chemical change is
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Melting of wax
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Ice to water
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Burning of paper
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freezing of water
Pick the change that can be reversed from the following
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Cutting of trees
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Melting of ghee
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Burning of candle
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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
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expands and fits onto the wooden wheel
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contracts and fits onto the wooden wheel
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no change in the size takes place
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expands first, then on cooling contracts and fits onto the wooden wheel.
Which of these is correct
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Boiling of rice is a physical change
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Water vapour into water is a chemical change
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Baking cake in an oven is a physical change
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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
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can be reversed.
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cannot be reversed.
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can be reversed and cannot be reversed, respectively.
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cannot be reversed and can be reversed, respectively
A process in which a solid melt to become a liquid on heating is called ______
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boiling
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evaporation
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melting
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expansion
irreversible change
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Melting of butter and chocolate
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burning of paper
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rolling of chapati from the dough
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freezing of water
______ changes are the changes in which __________________ properties of a substance change, and a new substance is formed
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Chemical
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physical
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reversible
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none of these
Changes that leads to the formation of a completely new substance is
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physical change
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chemical change
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both a& b
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none
Boiling of rice is a
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physical change
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chemical change
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periodical change
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reversible change
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