Sorting Materials into Groups

NCERT Solution

State whether the statements given below are True or false
  1. Stone is transparent, while glass is opaque.
  2. A notebook has luster, while eraser does not.
  3. Chalk dissolves in water.
  4. A piece of wood floats on water.
  5. Oil mixes with water.
  6. Sand settles down in the water.
  7. Vinegar dissolves in water.
  8. Answer: 1 False, 2 False, 3 False, 4 True, 5 False, 6 True, 7 True

    Answer the following questions

    Name the objects which can be made from iron and wood.

    Answer: Wooden items: window, door, sofa, chair, etc.

    Iron items: Car, truck, bridge, utensil, grill, etc.

    Select those objects from the following which shine.

    Glass bowl, plastic toy, steel spoon, cotton shirt.

    Answer: Glass bowl and steel spoon

    List all items known to you that float on water. Check and see if they will float on an oil or kerosene.

    Answer: Items; like wood, cork, Styrofoam, etc. float on water as well as on oil.

    Name two materials which are soluble in water.

    Answer: Sugar and salt.

    Name two transparent and two opaque materials.

    Answer: Glass, acrylic sheet are transparent materials, while stone and wood are opaque materials.

    What are metals?

    Answer: The substance which is hard, has luster and is good conductor of heat and electricity is called metal.

    What is transparent material?

    Answer: The material which allows light to pass through it is called transparent materials.

    Match the objects given below with the materials from which they could be made. Remember, an object could be made from more than one material and a given material could be used for making many objects.


    ChairWood, plastic
    ToyPlastic, wood, paper
    ShoesLeather, plastic

    Answer the following questions

    Given below are names of some objects and materials.

    Water, basketball, orange, sugar, globe, apple and earthen pitcher.

    Group them as:

    1. Round shaped and other shapes.

      Answer: Round-shaped: Basketball, orange, globe and earthen pitcher.
    2. Eatables and non eatables

      Answer: Eatables: Water, orange, sugar and apple.

      Non-eatables: Basketball, globe and earthen pitcher.

    Find the odd one out from the following.

    1. Chair, bed, table, baby, cupboard

      Answer: Baby is a living being, while others are non-living.
    2. Rose, jasmine, Boat, Marigold, Lotus.

      Answer: Boat is a mode of transport, while others are flowers.
    3. Aluminium, iron, copper, silver, sand.

      Answer: Sand is non-metal, while others are metals.
    4. Sugar, Salt, sand, copper sulphate.

      Answer: Sand is insoluble in water, while others are soluble in water.

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