Organic Chemistry C. Polymer

21. Which one of the following polymers is widely used for making bulletproof material? [U.P. U.D.A./L.D.A. (Mains) 2010]

(a) Polyvinyl chloride
(b) Polyamides
(c) Polyethylene
(d) Polycarbonates

Correct Answer: (b) Polyamides

Solution:Kevlar is a material commonly used to make bulletproof vests. Kevlar is a para-aromatic polyamide (Poly-Paraphenylene Terephthalamide) synthetic fiber. It contains lots of inter-chain bonds which make it extremely strong. Layers of laminated glass are also used for making bulletproof materials.

22. Which one of the following polymers is used for making bullet-proof windows? [U.P.P.C.S. (Pre) 2015]

(a) Polycarbonates
(b) Polyurethanes
(c) Polystyrene
(d) Polyamides

Correct Answer: (a) Polycarbonates

Solution:Bullet-resistant glass is made or manufactured by using polycarbonate, thermoplastic, and layers of laminated glass. It can be used in making bulletproof jackets.

23. Which one of the following is used in making Bullet-proof Jacket?

(a) Fibrous glass
(b) Gun metal
(c) Lead
(d) Laminated glass

Correct Answer: (d) Laminated glass

Solution:Bullet-resistant glass is made or manufactured by using polycarbonate, thermoplastic, and layers of laminated glass. It can be used in making bulletproof jackets.

24. Which one of the following polymers are used for making bulletproof materials? [U.P.P.C.S. (Mains) 2017]

I. Kevlar
II. Glyptal
III. Lexan

Select the correct answer using the codes given below:
Code:

(a) I and II
(b) II and III
(c) I and III
(d) None of the above

Correct Answer: (c) I and III

Solution:Kevlar (polyamide) is best known for its use in ballistic and stab-resistant body armour, and Lexan (polycarbonate) is used for making bulletproof materials. Glyptal is a condensation polymer which is used in the manufacturing of paints and lacquers (protective coating for woods, metals).

25. Consider the following statements: [U.P.P.C.S. (Pre) 2003, U.P. U.D.A./L.D.A. (Pre) 2002]

Teflon and Dacron are polymers.
Neoprene is synthetic rubber.
Polythene is polyethylene polymer.
Natural rubber is chloroprene.

Which of the above statements are correct?

(a) 1, 2, and 3
(b) 1, 2, and 4
(c) 2, 3 and 4
(d) 1, 3 and 4.

Correct Answer: (a) 1, 2, and 3

Solution:Natural rubber is a polymer of 'Isoprene' which is obtained as a latex from rubber trees, Rubber obtained from an artificial of synthetic rubbers that are produced by polymerization of source is known as synthetic rubber. Neoprene is a family chloroprene. Teflon and Dacron are examples of polymers. Polythene or polyethylene is a polymer of ethylene.

26. A polymer used for making nonstick surface coating for utensils is – [U.P.P.C.S. (Spl.) (Mains) 2008]

(a) Polyvinyl chloride
(b) Teflon
(c) Polystyrene
(d) Polypropylene

Correct Answer: (b) Teflon

Solution:Polytetrafluoroethylene (PTFE) is usually known as Teflon. PTFE is a solid fluorocarbon. Its density is 2.2 g/cm³ and its melting point is 327°C. This is especially used for making non-stick surface coating for utensils.

27. Which one of the following polymers is used for the production of non-stick pans? [U.P.P.C.S. (Pre) 2015]

(a) Teflon
(b) Neoprene
(c) P.V.C.
(d) Gutta-Percha

Correct Answer: (a) Teflon

Solution:Polytetrafluoroethylene (PTFE) is usually known as Teflon. PTFE is a solid fluorocarbon. Its density is 2.2 g/cm³ and its melting point is 327°C. This is especially used for making non-stick surface coating for utensils.

Neoprene: Synthetic rubber, not for non-stick pans.

P.V.C.: Polyvinyl chloride, not for non-stick pans.

Gutta-Percha: A natural latex, historically used for insulation and golf ball covers, not for non-stick pans.

28. Non-stick frying pans are coated with – [Jharkhand P.C.S. (Pre) 2016]

(a) Orlon
(b) Teflon
(c) Polystyrene
(d) Polypropylene

Correct Answer: (b) Teflon

Solution:Polytetrafluoroethylene (PTFE) is usually known as Teflon. PTFE is a solid fluorocarbon. Its density is 2.2 g/cm³ and its melting point is 327°C. This is especially used for making non-stick surface coating for utensils.

29. What is Teflon? [Jharkhand P.C.S. (Pre) 2010]

(a) Fluorocarbon
(b) Hydrocarbon
(c) Microbicides
(d) Insecticide

Correct Answer: (a) Fluorocarbon

Solution:Polytetrafluoroethylene (PTFE) is usually known as Teflon. PTFE is a solid fluorocarbon. Its density is 2.2 g/cm³ and its melting point is 327°C. This is especially used for making non-stick surface coating for utensils.

30. Teflon is a polymer of which of the following monomers? [60th to 62nd B.P.S.C. (Pre) 2016]

Correct Answer: (a) Tetrafluoroethylene

Solution:Polytetrafluoroethylene, commonly known as Teflon. The monomer for polytetrafluoroethylene is tetrafluoroethylene (

C F₂ = C F

).

Organic Chemistry C. Polymer

21. Which one of the following polymers is widely used for making bulletproof material? [U.P. U.D.A./L.D.A. (Mains) 2010]

22. Which one of the following polymers is used for making bullet-proof windows? [U.P.P.C.S. (Pre) 2015]

23. Which one of the following is used in making Bullet-proof Jacket?

24. Which one of the following polymers are used for making bulletproof materials? [U.P.P.C.S. (Mains) 2017]

25. Consider the following statements: [U.P.P.C.S. (Pre) 2003, U.P. U.D.A./L.D.A. (Pre) 2002]

26. A polymer used for making nonstick surface coating for utensils is – [U.P.P.C.S. (Spl.) (Mains) 2008]

27. Which one of the following polymers is used for the production of non-stick pans? [U.P.P.C.S. (Pre) 2015]

28. Non-stick frying pans are coated with – [Jharkhand P.C.S. (Pre) 2016]

29. What is Teflon? [Jharkhand P.C.S. (Pre) 2010]

30. Teflon is a polymer of which of the following monomers? [60th to 62nd B.P.S.C. (Pre) 2016]

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