CBSE Questions for Class 6 Chemistry Changes Around Us Quiz 2 - MCQExams.com

 Heat gain makes ice to:
  • freeze
  • evaporate
  • melt
  • none of these
Which of the following is true about dissolving salt in water?
  • Dissolving salt in water is an example of a reversible change
  • Dissolving salt in water is an example of a irreversible change
  • It depends on the conditions of dissolution
  • None of the above
Which of the following is permanent change?
  • Physical change
  • Chemical change
  • Both physical and chemical change
  • None of the above

The change of water into vapour (vaporisation) is a:
  • physical and reversible change
  • chemical and reversible change
  • physical and irreversible change
  • irreversible change
Which one of the following is a reversible change?
  • Cutting wood into pieces.
  • Blooming of bud into flowers.
  • Melting of ice.
  • All of these
Burning of Magnesium ribbon is a _______
  • Chemical change
  • Physical change
  • Reversible change
  • None of the above
Things or processes which cannot be reversed are called
  • Irreversible process
  • Reversible process
  • Cyclic process
  • None of the above
Rohan tore a sheet of paper into pieces and then burnt them. Identify the irreversible change taking place in the process.
  • Tearing the sheet into pieces
  • Burning the pieces
  • Both tearing and burning the pieces
  • None of these
A ball rolls down the hill. A chemical reaction takes place producing heat and an explosion. These are examples of?
  • Simple processes
  • Unnatural processes
  • Irreversible processes
  • Reversible processes
An iron ring is heated. Which of the following statement about it is incorrect? 
  • The ring expands.
  • The ring almost comes to the same size on cooling.
  • The change, in this case, is reversed.
  • The ring changes its shape and the change cannot be reversed.
 Salt can be separated from its solution (salt dissolved in water) because:
  • mixing salt in water is a change that can be reversed by filtration
  • mixing salt in water is a change that can be reversed by decantation
  • mixing of salt in water is a change that can be reversed by freezing
  • mixing of salt in water is a change that can be reversed by evaporation
Melting of wax is
  • Physical change
  • Reversible change
  • Both A and B
  • None of the above
Melting of ice is a 
  • reversible change
  • irreversible change
  • chemical change
  • None of these
Burning of paper and formation of curd are reversible changes.
  • True
  • False
The 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
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.
Reversible change is:
  • formation of vapour on heating of milk
  • formation of butter from churning curd
  • ripening of fruit
  • falling of leaves from trees

Stretching of a rubber band is what kind of change?
  • Irreversible change
  • physical and reversible change
  • chemical and irreversible change
  • physical and irreversible change
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