Engineering :: Engineering Materials
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| 331. |
Polymers |
| A. |
Can be vaporised as well as recycled |
B. |
Can neither be vaporised nor recycled |
| C. |
Can be vaporised but cannot be recycled |
D. |
Can be recycled but cannot be vaporised |
Answer: Option B
Explanation:
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| 332. |
Thermosetting polymers are |
| A. |
Injection moulded |
B. |
Extruded |
| C. |
Cast moulded |
D. |
None of the above |
Answer: Option C
Explanation:
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| 333. |
Polysterene is |
| A. |
An ester |
B. |
An alcohol |
| C. |
A hydrocarbon |
D. |
An alkyl halide |
Answer: Option C
Explanation:
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| 334. |
Which of the following polymer is crystalline? |
| A. |
Polyethylene |
B. |
Polymethyl metacrylate |
| C. |
Polyvinyl chloride |
D. |
Polyvinylidene chloride |
Answer: Option A
Explanation:
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| 335. |
Neoprene is |
| A. |
Rubber |
B. |
Plastic |
| C. |
Rubber like plastic |
D. |
None of the above |
Answer: Option C
Explanation:
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| 336. |
Phenol and formaldehyde are polymerised to a resultant product known as |
| A. |
PVC |
B. |
Bakelite |
| C. |
Polyester |
D. |
None of the above |
Answer: Option B
Explanation:
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| 337. |
Polyethylene is produced by |
| A. |
Condensation polymerization |
B. |
Addition polymerization |
| C. |
Colpolymerization of ethylene monomers |
D. |
None of the above |
Answer: Option B
Explanation:
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| 338. |
Thermoplastic and thermoset polymers differ in |
| A. |
Glass transition temperature |
B. |
Thermal behaviour |
| C. |
Mechanical behaviour |
D. |
All of the above |
Answer: Option B
Explanation:
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| 339. |
Which of the following class of materials are good conductors of heat and electricity? |
| A. |
Metals |
B. |
Ceramics |
| C. |
Polymers |
D. |
Dielectries |
Answer: Option A
Explanation:
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| 340. |
The crystal structure of a material can be studied by |
| A. |
Electron microscope |
B. |
X-ray difraction |
| C. |
Electron probe X-ray microanalyser |
D. |
All of the above |
Answer: Option B
Explanation:
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