RPH f2w
- Pick out the incorrect statement with regards to thermo-plastics.
(a) Catalyst are not added
(b) Formed by addition polymerisation
(c) Once solidify cannot be softened
(d) Example is plexiglass - Which of the following is not an example of thermoplastic?
(a) Polyethylene (b) Nylon
(c) PVC (d) Bakalite - Camphor in plastic is used as
(a) resin (b) plasticiser
(c) filler (d) catalyst - Which of the following is useed for making electrical switches?
(a) PVC (b) Polypropylene
(c) Bakelite (d) Polyvinyl accetate - Neoprene is suitable for use in
(a) bearings of bridges
(b) hard duty rubber coatings of floors
(c) joinery works
(d) floors of dance halls - The vulcanizing agent used in rubber is
(a) wax (b) rosin oil
(c) zinc (d) sulphur - To impart strength and rigidity to the rubber tyres the reinforcing filler used is
(a) carbon black (b) sulphur
(c) rosin oil (d) antioxidant - The material which provides maximum elasticity to plastics is
(a) filler (b) accelerator
(b) elastomer (d) solvent - The materials added to plastics to improve their mechanical properties and make them
economical are known as
(a) accelerators (b) plasticizers
(c) fillers (d) stabilizers
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- (b) 2. (b) 3. (b) 4. (c) 5. (d) 6. (b) 7. (c) 8. (a) 9. (d) 10. (c)
- (a) 12. (c)