Given below are extra questions for class 6 science chapter 4 Sorting Materials Into Groups

1. Name some objects having round shape

Balls, glass marbles, wheels, globe

2. Examples of shining objects

Copper wire, aluminium sheet, glass bowl

3. Common metals

Iron, copper, aluminium, gold

4. Why do metal rods lose their shine?

Metal rods lose their shine because of the action of air and moisture on them.

5. Why only freshly cut surfaces of metal rods have lustre

When metal rods are exposed to air for a long period of time, they lose their lustre because of the action of air and moisture on them. Since freshly cut surfaces of metals are not exposed to air or water, they look shiny.

6. What are soft materials?

Materials which can be compressed or scratched easily are called soft materials. Examples are: cotton and sponge

7. What are hard materials?

Materials which are difficult to compress are called hard materials. Example: iron, wood

8. What are soluble substances?

Substances that can be dissolved in water are called soluble substances. Example: sugar and salt

9. What are insoluble substances?

Substances that cannot be dissolved in water are called insoluble substances. Example: sand, sawdust, flour

10. Name a gas dissolved in water?

Oxygen

11. How do some plants and animals manage to live in water?

Water has small amounts of oxygen dissolved in it. Water plants and animals are able to breathe this dissolved oxygen.

12. What are transparent materials?

Transparent materials are those substances through which things can be seen. Example: glass, water, air

12. What are opaque substances?

Opaque substances are those substances through which things cannot be seen. Examples: metal container, cardboard box

13. What are translucent objects?

The materials through which objects can be seen, but not clearly, are called translucent objects. Example: oiled paper

14. What are metals?

Metals are hard and lustrous objects that conduct electricity. Examples: copper, iron

15. What are non-metals?

Non-metals are brittle substances that do not conduct electricity well. Examples are: wood, coal, plastic

16. Describe an experiment to show that palm is translucent?

When you are in a dark room, cover the glass of a torch with your palm. Switch on the torch and look at the other side of the palm. You can see that some of the light passes through the palm; however, all of it does not pass through it. This experiment shows that the palm is translucent.

17. Name some objects that float in water

Plastic ball, dry leaves, sponge

18. Name some objects that sink in water

Coin, stone, metal, key