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151.

Which of the following is a thermo setting resins?(a) Polyethylene(b) Polyvinyl chloride(c) Polyvinyl cyanide(d) BakeliteI had been asked this question in an online quiz.Query is from Plastics topic in division High Polymers and Plastics of Applied Chemistry

Answer» CORRECT option is (d) Bakelite

The EXPLANATION: The Bakelite COMES under the thermo setting resins. The polyethene and poly vinyl CHLORIDE comes under the thermo plastic resins.
Discussion
152.

Thermo setting plastics are formed by _________(a) Step polymerisation(b) Suspension polymerisation(c) Emulsion polymerisation(d) Co-ordination polymerisationThe question was posed to me in class test.I need to ask this question from Plastics topic in section High Polymers and Plastics of Applied Chemistry

Answer»

The correct OPTION is (a) STEP POLYMERISATION

Explanation: Thermo SETTING plastics are formed by the step polymerisation. The thermo plastic resins are formed by chain polymerisation.
Discussion
153.

The abrasion resistance of the plastic is ____________(a) Low(b) Very low(c) High(d) ModerateI had been asked this question in a job interview.The doubt is from Plastics in portion High Polymers and Plastics of Applied Chemistry

Answer»

Correct option is (C) High

Easiest EXPLANATION: The ABRASION resistance of the PLASTIC is high. Th plastic has the dimensional stability. It is impermeable to water.
Discussion
154.

If the polymer is in the room temperature then it is ___________(a) Brittle(b) Viscofluid state(c) Amorphous(d) RubberyI got this question during an online exam.My question comes from Properties of Polymers in portion High Polymers and Plastics of Applied Chemistry

Answer»

The CORRECT answer is (d) Rubbery

Easy explanation: The EFFECT of heat on polymer is high. If the temperature CHANGES, the STATE of the polymer will be CHANGED.
Discussion
155.

A water _____________ initiator is introduced into the water phase.(a) Soluble(b) Insoluble(c) Partially soluble(d) Neither soluble nor insolubleThis question was addressed to me in an online quiz.My doubt stems from Methods of Polymerization in portion High Polymers and Plastics of Applied Chemistry

Answer»

Right ANSWER is (a) Soluble

Explanation: A WATER soluble INITIATOR is introduced into the water phase. The initiator then diffuses through water into the micelle.
Discussion
156.

The structural regularity of the polymers may be due to _________(a) Isomerism(b) Optical isomerism(c) Geometrical isomerism(d) Both optical and geometrical isomerismI had been asked this question by my school principal while I was bunking the class.My question comes from Mechanism of Polymerization topic in portion High Polymers and Plastics of Applied Chemistry

Answer»

Correct CHOICE is (d) Both optical and GEOMETRICAL ISOMERISM

For EXPLANATION: The STRUCTURAL regularity of the polymers may be due to both optical and geometrical isomerism.
Discussion
157.

For free radical chain polymerisation _________ are the good initiators.(a) Benzoyl peroxide(b) Hydrogen peroxide(c) Benzoyl peroxide and hydrogen peroxide(d) Neither benzoyl peroxide nor hydrogen peroxideThe question was posed to me in final exam.The above asked question is from Mechanism of Polymerization topic in chapter High Polymers and Plastics of Applied Chemistry

Answer»

Right choice is (C) Benzoyl peroxide and hydrogen peroxide

To explain I WOULD SAY: For FREE radical chain polymerisation, Benzoyl peroxide and hydrogen peroxide are the good initiators. They produce monomer free radicals.
Discussion
158.

Which of the following is the example of the syndiotactic polymers?(a) Poly propylene(b) Poly vinyl chloride(c) Gutta percha(d) Poly lactic acidsThe question was asked in semester exam.My doubt stems from Types of Polymers in division High Polymers and Plastics of Applied Chemistry

Answer»

Correct answer is (C) Gutta percha

For explanation I WOULD say: The gutta percha is the natural form of rubber. It is the example of the syndiotactic polymers in which the functional GROUPS are alternately arranged. Poly propylene and poly lactic ACIDS are the examples of the isotactic polymers.
Discussion
159.

The different monomers are arranged alternatively in __________(a) Alternate straight chain polymers(b) Regular straight chain copolymers(c) Straight chain copolymer(d) Cross linked polymersThe question was asked in final exam.My question comes from Types of Polymers in division High Polymers and Plastics of Applied Chemistry

Answer»

Correct CHOICE is (a) Alternate straight CHAIN polymers

Explanation: The different monomers are arranged alternatively in alternate straight chain polymers. The REGULAR straight chain polymers the MONOMERIC units arranged regularly.
Discussion
160.

BUNA – N is a co-polymer of ___________ and __________(a) Butadiene, acrylonitrile(b) Sodium poly sulphide, ethylene dichloride(c) Benzene, ethylene(d) Acetaldehyde, ethyl alcoholThe question was posed to me in semester exam.Asked question is from Synthetic Rubber topic in portion High Polymers and Plastics of Applied Chemistry

Answer»

Right CHOICE is (a) Butadiene, ACRYLONITRILE

Easy explanation: BUNA – N is a co-polymer of the acrylonitrile and butadiene. Thiokol is the co-polymer of the sodium POLY SULPHIDE and ethylene dichloride. Styrene is the co-polymer of the benzene and ethylene.
Discussion
161.

Which of the following can be made by the BUNA – S?(a) Cable insulations(b) Coats(c) Water proof clothes(d) CosmeticsThe question was asked by my school principal while I was bunking the class.The above asked question is from Synthetic Rubber topic in section High Polymers and Plastics of Applied Chemistry

Answer»

Correct ANSWER is (a) Cable insulations

To explain I would SAY: The cable insulations and the wires can be MADE by the BUNA -S. Floor files, tank linings in chemical INDUSTRIES and as an adhesive.
Discussion
162.

The BUNA – S is _________ chemicals.(a) Attacked by(b) Resistant to(c) Neither resistant nor attacked(d) NeutralThis question was posed to me in quiz.The question is from Synthetic Rubber topic in portion High Polymers and Plastics of Applied Chemistry

Answer»

Right choice is (B) RESISTANT to

Easy EXPLANATION: The BUNA – S is resistant to the chemicals and it is swelled by the oils and attacked by the TRACES of ozone present in atmosphere.
Discussion
163.

Styrene rubber is a _________(a) Strong(b) Weak(c) Neither strong nor weak(d) Very weakI got this question in homework.I'd like to ask this question from Synthetic Rubber in portion High Polymers and Plastics of Applied Chemistry

Answer» CORRECT answer is (a) Strong

Explanation: STYRENE RUBBER is strong and tough polymer. Styrene is from benzene and ETHYLENE in presence of anhydrous aluminium chloride as catalyst.
Discussion
164.

Which of the following are used as the fillers?(a) Vegetable oils(b) Camphor(c) Ester of stearic acids(d) Wood flourThis question was addressed to me in an internship interview.Question is taken from Compounding of Plastics in chapter High Polymers and Plastics of Applied Chemistry

Answer»

Right option is (d) WOOD flour

To explain I would say: VEGETABLE oils, camphor and ESTER of stearic ACIDS are USED as the plasticizers. The wood flour, ZnO, PbO are used as the fillers.
Discussion
165.

Polyurethanes possess __________(a) No impact resistance(b) Softness(c) Hardness(d) No tear resistanceI have been asked this question in unit test.This question is from Preparation, Properties and Applications of Some Compounds in portion High Polymers and Plastics of Applied Chemistry

Answer»

The correct choice is (c) Hardness

Explanation: The polyurethanes POSSESS the IMPACT RESISTANCE, TENSILE STRENGTH, hardness, abrasion and tear resistance.
Discussion
166.

The thermo setting resins have three dimensional network structures.(a) True(b) FalseThis question was addressed to me during an interview.I would like to ask this question from Plastics topic in division High Polymers and Plastics of Applied Chemistry

Answer»

Right choice is (a) True

Explanation: The thermo setting resins have THREE dimensional NETWORK structures. The thermo PLASTICS consists of LONG chain LINEAR polymers.
Discussion
167.

Thermo plastics becomes ________ on heating.(a) Rigid(b) Moulded(c) Soft(d) BrittleI got this question during an interview for a job.Asked question is from Plastics topic in portion High Polymers and Plastics of Applied Chemistry

Answer»

The CORRECT choice is (C) Soft

The explanation: On HEATING the thermo plastic resins, they BECOME soft and on cooling they become RIGID reversibly. The thermo setting resins are moulded on heating.
Discussion
168.

The plastics are _________(a) Semi conductors(b) Conductors(c) Conducts at above room temperature only(d) InsulatorsThis question was addressed to me by my college director while I was bunking the class.This is a very interesting question from Plastics in portion High Polymers and Plastics of Applied Chemistry

Answer» CORRECT CHOICE is (d) Insulators

Explanation: The plastics are very good insulators. They are considered as the good ENGINEERING materials due to the this REASON ALSO.
Discussion
169.

The final product can directly used for fabrication in emulsion polymerisation.(a) True(b) FalseThis question was addressed to me by my college director while I was bunking the class.I would like to ask this question from Methods of Polymerization topic in section High Polymers and Plastics of Applied Chemistry

Answer»

Correct CHOICE is (a) True

Easiest explanation: The final PRODUCT can be USED as directly for fabrication in EMULSION polymerisation. It is one of the advantages. High molecular WEIGHT polymers can be produced.
Discussion
170.

Depending on the morphology of the particles, the suspension polymerisation is carried out in ______ types.(a) Five(b) Four(c) Three(d) TwoThis question was addressed to me by my school principal while I was bunking the class.This key question is from Methods of Polymerization in division High Polymers and Plastics of Applied Chemistry

Answer» CORRECT OPTION is (d) TWO

Explanation: Depending on the MORPHOLOGY of the particles, the suspension polymerisation is carried out in two types. They are bead polymerisation and POWDER polymerisation.
Discussion
171.

A monomer is dispersed in a solution of_________ and ____________ forming the relatively large droplets of monomer.(a) Micelle, water(b) Surfactant, alcohol(c) Surfactant, vinegar(d) Surfactant, waterI have been asked this question in an interview.I would like to ask this question from Methods of Polymerization in portion High Polymers and Plastics of Applied Chemistry

Answer»

Correct OPTION is (d) Surfactant, WATER

Best explanation: A monomer is DISPERSED in a SOLUTION of surfactant and water. So, that it forms the large droplets of monomer in water.. This is DUE to the micelle.
Discussion
172.

The polymers whose backbone is made of same type of atoms called ___________(a) Homo polymers(b) Heterochain polymers(c) Isotactic polymers(d) Atactic polymersThe question was posed to me in quiz.Query is from Types of Polymers in portion High Polymers and Plastics of Applied Chemistry

Answer»

Right OPTION is (a) Homo polymers

Easy explanation: The polymers WHOSE back BONE is MADE of some type of atoms is called as homopolymers. The heteropolymers BACKBONE is constructed by the two or more than two different types of atoms.
Discussion
173.

The functionality of the monomer is a __________ bond.(a) Single(b) Double(c) Triple(d) NoI got this question during an online interview.My question is taken from Mechanism of Polymerization in section High Polymers and Plastics of Applied Chemistry

Answer» RIGHT answer is (b) DOUBLE

For EXPLANATION: The functionality of the monomer is a double bond and bi functional. The chain polymerisation yields the PRODUCT which is EXACT multiple of the monomers.
Discussion