Exercise, 8th Sci., 17. Man-made Materials

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1. Write uses of Polypropylene (PP).

2. Silica, i.e., SiO₂, which we refer to as ... .

3. As alkali silicate glass is soluble in water, it is called '... glass.'

4. Write two types of plastic.

5. Write uses of polyurethane.

6. ... is a form of a complex material called polystyrene.

7. Write properties of glass.

8. ... glass is used to produce laboratory glassware.

9. Write the long form of PVC.

10. Define manmade materials.

11. There are more than ... different types of plastics.

12. Being very clear/transparent, ... glass is used in manufacturing of light bulbs, tubes, etc.

13. Due to carcinogenic ingredients in ..., the person in contact with thermocol for a long duration may have the possibility of blood cancer like leukemia and lymphoma.

13.1 Write uses of polyvinyl chloride.

14. Write uses of Bakelite.

14.1 Write 3 examples of processed glass.

15. A specific shape is given with the help of a mold, and its shape cannot be changed on heating; this is called ... plastic.

16. To prevent the degradation due to sunlight, some materials are stored in which type of bottles?

17. Write the 4R principle.

18. Write uses of polyester.

19. A manmade material showing the property of plasticity and made up of organic polymers is ... .

20. Vehicles are coated with ... to protect from scratches.

21. Write down the type of glasses.

22. The plastic that can be molded as per our wish is called ... .

23. Write uses of 2. Polystyrene (PS).

24. Sand, i.e., silicon dioxide, melts at 1700°C. So as to melt the mixture at low temperature, pieces of discarded ...  are added to it.

25. ... is a type of plastic used for manufacturing lenses & artificial teeth.

26. ... is the non-crystalline, hard but brittle solid material formed from a mixture of silica and silicate.

27. Write uses of melamine.

28. Write uses of thermosetting plastic.

29. Write the effect on a human being working in a thermocol factory.

30. Write uses of polyethylene (PE).

31. Which type of glass is used in vehicles to avoid injuries in accidents?

32. Some materials are naturally degraded; they are called ... materials.

Ferrous oxide is mixed to get bluish-green glass and copper oxide to get ... glass.

33. Distinguish between.

a. Man-made material and natural material

b. Thermoplastic and thermosetting plastic.

34. Who is my partner?

‘A’ column         ‘B’ column

a. Lead glass       i. Plates

b. Bakelite          ii. Mattresses

c. Thermocol      iii. Electric bulb

d. Optic glass     iv. Electric switch

e. Polypropylene     v. Lens

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