Available Answers

1. 1.

   Look around yourself. Classify the things around you as natural or man-made.

   Natural Things	Man-made Things

    

2. 2.

   Fill in the blanks.

   1. Grouping things together on the basis of some common properties are called __________.
   2. __________ saves time and energy.
   3. Glass, stainless steel, plastics, ply-wood are __________.
   4. All those materials that can be touched, tasted, smelt or fuelled are called __________.
   5. Matter can be defined as something that has __________ and __________.
   6. If most of all the light can pass through an object, it is called __________.
   7. Objects which do not allow light to pass through are called __________.
   8. Object that allows light to pass partially is called __________.
   9. Some materials are __________ by magnets, while others are not.
   10. Materials that burn easily are called __________.
3. 3.

   Tick (√) the correct answer:

   1. Classification is
      1. grouping things as living and non-living
      2. grouping living things on the basis of common properties
      3. grouping non-living things on the basis of common properties
      4. grouping all things on the basis of some common properties
   2. The property of a substance which dissolves in water is
      1. sublimation
      2. diffusion
      3. solubility
      4. ductility
   3. On heating, matter changes from solid state to liquid state. This process is called
      1. freezing
      2. melting
      3. condensation
      4. evaporation
   4. Which of the following is magnetic
      1. iron
      2. rubber
      3. sodium
      4. glass
4. 4.

   Fill in the blanks:

   1. A substance which dissolves in water is called ______________.
   2. Utensils are made of metals because metals are ______________.
   3. Materials which have special shine on them are known as to be ______________.
   4. A material which allows the heat energy to pass through it easily is called ______________.
   5. Water is a ______________ conductor of heat.
5. 5.

   Write 'T' for true and 'F' for false:

   1. Salt is insoluble in water.
   2. Paper is a good conductor of heat.
   3. Handles of utensils should be made up of metals.
   4. Classification is done only for living things.
   5. An iron nail sinks in water because the density of the iron nail is more than that of water.
   6. Glass is a magnetic substance.
6. 6.

   What do you mean by classification?