1) Match the following group 1 items(rubbers) with group 2 items (Rubber formation) and select the correct option
1. Nitrate rubbers ----------------------------------- A. copolymerization of butadiene and styrene
2. Butadiene rubbers ------------------------------- B. polymerization of isobutylene with isoprene
3. Neoprenes ----------------------------------------- C. copolymerization of butadiene and crylonitrite
4. Butyl rubbers ------------------------------------- D. polymerization of chloroprene molecules
a. 1 – A, 2 – D, 3 – B, 4 - C
b. 1 – B, 2 – C, 3 – D, 4 - A
c. 1 – C, 2 – A, 3 – D, 4 – B
d. 1 – C, 2 – B, 3 – A, 4 - D
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Answer
Explanation
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ANSWER: 1 – C, 2 – A, 3 – D, 4 – B
Explanation:
No explanation is available for this question!
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2) What are thermoplastics?
a. They are nonlinear polymers, in which rise in temperature increases plasticity
b. They are linear polymers, in which rise in temperature increases plasticity
c. They are linear polymers, in which temperature rise has no effect on plasticity
d. None of the above
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Answer
Explanation
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ANSWER: They are linear polymers, in which rise in temperature increases plasticity
Explanation:
No explanation is available for this question!
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3) What happens when thermosetting polymers are heated?
a. They become soft
b. They are deformed
c. They become rigid
d. All of the above
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Answer
Explanation
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ANSWER: They become rigid
Explanation:
No explanation is available for this question!
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4) Which among the following is the characteristics of polymers?
a. High tensile strength
b. High coefficient of friction
c. Low density
d. All of these
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Answer
Explanation
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ANSWER: Low density
Explanation:
No explanation is available for this question!
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5) How is Ester produced?
a. Addition polymerization
b. Condensation polymerization
c. Substitutional polymerization
d. None of these
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Answer
Explanation
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ANSWER: Condensation polymerization
Explanation:
No explanation is available for this question!
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6) Which type of composite materials the sandwich panels are?
a. Structural
b. Fiber reinforced
c. Particle reinforced
d. None of the above
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Answer
Explanation
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ANSWER: Structural
Explanation:
No explanation is available for this question!
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7) Which among the following rubbers are used for automobile tyres?
a. Only Polyurethane rubbers
b. Only Butadiene rubbers
c. Both Polyurethane and Butadiene are used
d. None of these
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Answer
Explanation
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ANSWER: Both Polyurethane and Butadiene are used
Explanation:
No explanation is available for this question!
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8) What is the byproduct formed by the condensation of methyl alcohol and acetic acid to form ester?
a. water
b. hydrogen
c. oxygen
d. none of the above
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Answer
Explanation
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ANSWER: water
Explanation:
No explanation is available for this question!
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9) Which materials can be used to manufacture elastomers?
a. Limestone
b. Petroleum
c. Alcohol
d. All of the above
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Answer
Explanation
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ANSWER: All of the above
Explanation:
No explanation is available for this question!
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10) Select the correct option which shows mechanical property of ceramic materials?
a. Non-crystalline ceramics become brittle below recrystallization temperature
b. At high temperatures ceramics have favorable properties
c. Ceramic products are resistant to oxidation
d. Ceramics can be used as a moderator
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Answer
Explanation
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ANSWER: Non-crystalline ceramics become brittle below recrystallization temperature
Explanation:
No explanation is available for this question!
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