Topic outline

    • Sorting Materials Into Groups

      Q1. State True/False

      i.             Opaque is a materials through which you are not able to see. True

      ii.            Insoluble substances mix in water. False

      iii.          Soft materials can be compressed or scratched. True

      iv.          Brick is opaque, while butter paper is translucent. True

      v.           Salt does not dissolve in water. False

      vi.          All gases are non–lustrous. True

      vii.        Oil mixes with water. False

      viii.       Stone settles down in water. True

      ix.          Vinegar does not mix with water. False

      x.           Iron is harder than sponge. True

      xi.          Air is transparent. True

      xii.        Glycerine is not soluble in water. False

      xiii.       Diamonds, gems and pearls are lustrous. True

      xiv.      Honey floats on the surface of water. False

      xv.        Alcohol is immiscible with water. False

      xvi.      Diamond is the hardest natural occurring substance. True.

      Q2. Fill in the blanks.

      i.             Oxygen gas is soluble in water.

      ii.            Grouping things together with similar properties is called Sorting/Classification.

      iii.          Mercury is the metal that exists in liquid state.

      iv.          Potassium is a soft metal that can be cut with a knife.

      v.           Iodine is a non-metal that has lustre.

      vi.          A piece of stone is a hard material.

      vii.        All gases are not soluble in water.

      viii.       Dried leaf floats on the surface of water.

      ix.          Oily patch on a piece of paper is translucent.

      x.           Water is a transparent liquid.

      xi.          Materials that have lustre are usually called as metal.

      xii.        Materials are grouped on the basis of similarities or dissimilarities in their properties.

      xiii.       Based upon transparency, materials can be grouped as opaque, transparent and translucent.

      xiv.      A substance which is used in making different objects is called material.

      Q3. Name a substance through which light can pass through partially but one cannot see through it clearly.

      Ans. Translucent


      Q4. Name a liquid which is lustrous.

      Ans. Amongst the liquids, mercury is the lustrous.

      Q5. Name two non-metals which are lustrous.

      Ans. Graphite and Iodine crystals


      Q6. What happens when we add mustard oil to a glass full of water?

      Ans. The mustard oil floats on water and forms a separate layer.


      Q7. Name some materials that float on water.

      Ans. wax, plastic ball, wood, leaf, ice, thermocol, oil


      Q8. Name some materials that sink in water.

      Ans. stone, key, screw, iron nail, coin


      Q9. Name any two things which can be made out of wood.

      Ans. Table and Chair

      Q10. Write the object from the following which shine: brick, earthen pitcher, glass bowl, plastic table, steel spoon, cotton bed sheet, newspaper.

      Ans. glass bowl and steel spoon


      Q11. Make a list of items that floats on kerosene.

      Ans. paper, thermocol, thin plastic sheet


      Q12. Name one lustrous material.

      Ans. Aluminium


      Q13. Which material is generally used for making pens?

      Ans. Plastic or Metal

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