1) Which plastic materials contain strong cross linkings in their molecular structure?
a. Thermoplastic materials
b. Thermosetting materials
c. Both a. and b.
d. None of the above
|
Answer
Explanation
|
ANSWER: Thermosetting materials
Explanation:
No explanation is available for this question!
|
|
2) Which of the following statements are correct for plastic?
1. Plastic is a non-metallic material that can be moulded to any shape
2. Plastic is a natural or synthetic resin
3. Plastic is of organic nature composed of hydrogen, oxygen, carbon and nitrogen
a. only statements 1 and 2 correct, statement 3 is wrong
b. only statements 1 and 3 correct, statement 2 is wrong
c. only statements 2 and 3 correct, statement 1 is wrong
d. all of above statements 1, 2 and 3 are correct
|
Answer
Explanation
|
ANSWER: all of above statements 1, 2 and 3 are correct
Explanation:
No explanation is available for this question!
|
|
3) The plastics which soften when heat is applied with or without pressure, but requires cooling to set them to shape are called as
a. thermosofting materials
b. thermosetting materials
c. thermoplastic materials
d. thermostatting materials
|
Answer
Explanation
|
ANSWER: thermoplastic materials
Explanation:
No explanation is available for this question!
|
|
4) Thermosetting materials are
a. the plastics which can be softened even after they have set and hardened
b. the plastics which require heat and pressure to mould them into shape
c. both a. and b.
d. none of the above
|
Answer
Explanation
|
ANSWER: the plastics which require heat and pressure to mould them into shape
Explanation:
No explanation is available for this question!
|
|
5) Which of the following is an example of thermoplastic material?
a. Camera bodies
b. Automobile parts
c. Electric plugs
d. Electric insulation
|
Answer
Explanation
|
ANSWER: Electric insulation
Explanation:
No explanation is available for this question!
|
|
6) Which of the following characteristics does not affect the properties of plastics?
a. Their molecular structure
b. Their degree of polymerization
c. Both a. and b
d. None of the above
|
Answer
Explanation
|
ANSWER: None of the above
Explanation:
No explanation is available for this question!
|
|
7) Specific gravity of the plastics is usually
a. less than the specific gravity of metals
b. more than the specific gravity of metals
c. similar to the specific gravity of metals
d. Unpredictable
|
Answer
Explanation
|
ANSWER: less than the specific gravity of metals
Explanation:
No explanation is available for this question!
|
|
8) The process of combining two or more distinct polymer molecules to form a new product with different characteristics is called as
a. binding
b. stabilizing
c. filling
d. blending
|
Answer
Explanation
|
ANSWER: blending
Explanation:
No explanation is available for this question!
|
|
9) The materials such as lead and barium, which are added with polymers to minimize the effect of heat, sunlight and ozone are called as
a. binders
b. blenders
c. stabilisers
d. fillers
|
Answer
Explanation
|
ANSWER: stabilisers
Explanation:
No explanation is available for this question!
|
|
10) Why are the plasticisers added with polymers?
a. To hold other constituents of plastic together
b. To reduce the cost and enhance the strength and hardness of plastics
c. To improve flexibility and to reduce the temperature and pressure required for moulding of plastics
d. None of the above
|
Answer
Explanation
|
ANSWER: To improve flexibility and to reduce the temperature and pressure required for moulding of plastics
Explanation:
No explanation is available for this question!
|
|
