Available Answers

1. 1.

   Choose the correct option.

   1. Insulators of heat are substances that
      1. allow heat to flow through them freely
      2. conduct electricity
      3. do not conduct electricity
      4. do not allow heat to flow through them
   2. How can sand be separated from pebbles and stones?
      1. Hand Picking
      2. Winnowing
      3. Sieving
      4. Magnetic Separation
   3. Common salt can be separated from water by
      1. Filtration
      2. Sedimentation
      3. Evaporation
      4. None of the mentioned processes
   4. Which of the following is a physical change?
      1. Melting of ice
      2. Curdling from milk
      3. Burning of paper
      4. Cooking of food
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   Answer:

   S A M P L E

   1. (d) do not allow heat to flow through them
   2. (a) Hand Picking
   3. (c
   4. (a) M...
2. 2.

   Write one word for the following.

   1. Shine of a material
   2. Materials that do not allow light to pass through them
   3. A solution that can dissolve no more of the solute
   4. A change that cannot be reversed
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   Answer:

   S A M P L E

   1. Lustre
   2. Opaque
   3. Saturated solution
   4. Irreversible change
3. 3.

   Circle the odd one.

   1. Hydrogen	Oxygen	Iron	(Hint: It is not a gas.)
   2. Rock	Wood	Copper	(Hint: It floats on water.)
   3. Sugar	Chalk	Sand	(Hint: It dissolves in water.)
   4. Irreversible	Temporary	New substances	(Hint: It is not a characteristic of a chemical change.)

    

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   Answer:

   S A M P L E

   1. Iron
   2. Wood
   3. Sugar
   4. Temporary
4. 4.

   Why do metal wires have a plastic covering?

5. 5.

   Name two processes that can be used to separate an insoluble solid from a liquid.

6. 6.

   Why are electric lines never hung tautly between the poles?