Tuesday , July 5 2022
NCERT 6th Class (CBSE) Science: Sorting Materials into Groups

NCERT 6th Class (CBSE) Science: Sorting Materials into Groups

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

Answer: (A) List of some items that float on water:

  1. Paper
  2. Wood
  3. Thin plastic sheets
  4. Wax
  5. Ice
  6. Thermocol
  7. Oil

(B) List of items that float on an oil:

  1. Paper
  2. Plastic sheet
  3. Wax
  4. Thermocol
  5. Wood

(C) List of items that float on kerosene:

  1. Paper
  2. Thermocol
  3. Thin plastic sheet

Question: Why do we need to group materials? Give one reason.

Answer: We often group materials for our convenience. It helps to describe their properties.

Question: Suggest two bases on which we can group objects.


  1.  Material used in making the object, e.g. wood or metal/plastic.
  2.  Material of the object is soft or hard, or substance is soluble or insoluble in water.

Question: Is a substance which can be compressed soft or hard?

Answer: Soft.

Question: Select a lustrous material out of the following substances:

Answer: Aluminium.

Question: Which material is generally used for making pens?Wood, aluminium, plastic, cotton

Answer: Plastic or metal.

Question: Is oil soluble in water?

Answer: Oil does not dissolve in water so it is insoluble in water but floats on the surface of water.

Question: Name two objects which are made from opaque materials.

Answer: Wooden doors, blackboard/steel plate.

Check Also

10th Science NCERT

Sources of Energy: 10th Science Chapter 14

Class: 10th Class Subject: Science Chapter: Chapter 14: Sources of Energy Quiz: – Questions MCQs: …


  1. Thanks for this all of the experiments.

  2. This helped me a lot. So thank you.??