17. Man made Materials

---

1. Which Plastic shape cannot be changed on heating? 1) PVC 2) thermosetting plastic 3) thermoplastic 4) Polythene

2. Which is not a Propertie of Plastic 1) Plastic does not decompose 2) Plastic is not easily affected by humidity 3) Plastic does not corrode 4) It is not bad conductor of heat and electricity

3. which of the following material made up from Polyvinyl chloride 1) laboratory appliances 2) mattresses 3) Milk bags 4) electric cable insulation

4. which plastic include in Thermosetting plastic? a) Bakelite b)Melamine c)Polyurethane d) Polypropylene (PP) 1) a,b and c 2) c,b and d 3) only a and c 4) only c and d

5. which of the following is non-degradable material. 1) leaves 2) paper 3) wood 4) Plastic

6. find odd man out 1) Wood 2) Vegetable 3) Plastic 4) Cotton cloth

7. Each responsible citizen should follow the 4R principle , which priciple tell us Reclaiming of substances? 1) Reduce 2) Reuse 3) Recover 4) Recycle

8. what Effect on persons working in thermocol factory seen ? 1) all of these 2) problems of respiratory system 3) problems of skin. 4) problems of eyes

9. which material not used in Production of Glass. 1) lime and small quantity of magnesium oxide 2) soil 3) sand 4) soda

10. While glass production, mixture needs to be heated up to -------------- 1) 3500 º C 2) 1500 º C 3) 150 º C 4) 500 º C

11. which glass is produced by using the silica? 1) Lead glass 2) Borosilicate glass 3) Silica glas 4) Alkali silicate glass