Class VI

Melting of wax is which type of change? 
  1. Undesirable 
  2. Reversible 
  3. Irreversible 
  4. Desirable 
Which of the following is an irreversible change? 
  1. Melting of wax 
  2. Growth of tree 
  3. Folding of paper 
  4. Melting of ice 
When iron is heated it 
  1. Contracts 
  2. Expands 
  3. Dissolves 
  4. Evaporates 
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 
  1. Expands and fits onto the wooden wheel . 
  2. Contracts and fits onto the wooden wheel .  
  3. No change in the size takes place . 
  4. Expands first, then on cooling contracts and fits onto the wooden wheel . 
An iron ring is heated . Which of the following statement about it is incorrect ? 
  1. The ring expands . 
  2. The ring almost comes to the same size on cooling . 
  3. The change in this case is reversed . 
  4. The ring changes its shape and the change cannot be reversed . 
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