Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to a very high temperature (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Pick out the correct statement.
(A) Plastics are good conductors of heat and electricity
(B) All the polymers are highly crystalline in nature
(C) Polymers can be vaporised by heating to a very high temperature
(D) The liquid polymer becomes greasy, then waxy and finally solid on
increasing the degree of polymerisation
by

1 Answer

Answer :

(D) The liquid polymer becomes greasy, then waxy and finally solid on
increasing the degree of polymerisation
by

Related questions

Visco-elastic behaviour of materials which is time dependent is common in (A) Plastics (B) Crystalline solid (C) Non-crystalline solids (D) Non-crystalline organic polymer

Description : Visco-elastic behaviour of materials which is time dependent is common in (A) Plastics (B) Crystalline solid (C) Non-crystalline solids (D) Non-crystalline organic polymer

Last Answer : (D) Non-crystalline organic polymer

Pick out the wrong statement regarding the solubility characteristics of high polymers. (A) Greater the degree of cross-linking in the polymer, lesser is its solubility (B) Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents (C) Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent (D) High molecular weight polymers on dissolving gives solution of very low viscosity

Description : Pick out the wrong statement regarding the solubility characteristics of high polymers. (A) Greater the degree of cross-linking in the polymer, lesser is its solubility (B) Polymers having more ... of the solvent (D) High molecular weight polymers on dissolving gives solution of very low viscosity

Last Answer : (D) High molecular weight polymers on dissolving gives solution of very low viscosity

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because – (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Description : On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because - (1) metals ... metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Last Answer : (3) metals are good conductors of heat Explanation: On a chilly day, the room temperature is lower than our body temperature. Since metals have a higher coefficient of thermal conductivity than plastic, they ... from our fingers will flow to the metal cap much more quickly than to the plastic body.

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Description : On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals ... metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Last Answer : metals are good conductors of heat

Pick out the correct combination about the role of various additives used in polymers. (A) Plasticiser: increases the polymer strength (B) Heat stabiliser: increases the maximum service temperature (C) Fillers: Does not affect the property of polymer but increases its weight (D) Lubricants: increases the flexibility of polymers

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Last Answer : Option C

Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density.

Description : Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density.

Last Answer : (C) Bad conductors of electricity.

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the (A) Low impact strength (B) High flexibility (C) Better finish and surface appearance (D) High plastic deformation

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Last Answer : A) Low impact strength

Pick out the wrong statement. (A) Addition polymers are generally formed by chain growth polymerisation (B) Condensation polymers are generally formed by step growth polymerisation (C) Teflon is formed by step growth polymerisation (D) Bakelite is formed by step growth polymerisation

Description : Pick out the wrong statement. (A) Addition polymers are generally formed by chain growth polymerisation (B) Condensation polymers are generally formed by step growth polymerisation (C) Teflon is formed by step growth polymerisation (D) Bakelite is formed by step growth polymerisation

Last Answer : C) Teflon is formed by step growth polymerisation

Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays

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Last Answer : (A) Polymeric fibres are never produced by addition polymerisation

Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or thermosetting (C) Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

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Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. (A) Nylon (B) Polyacrylonitrile (C) Polypropylene (D) Polyester

Description : Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. (A) Nylon (B) Polyacrylonitrile (C) Polypropylene (D) Polyester

Last Answer : (B) Polyacrylonitrile

White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used fo

Description : White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used fo

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White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used fo

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White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used fo

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Pick out the wrong statement. (A) Polymers made of only one monomer is called homopolymer (B) Polymers made of more than one monomer is called copolymer or mixed polymer (C) Vulcanised rubber is more elastic than natural rubber

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Last Answer : (A) Polymers made of only one monomer is called homopolyme

When I do the dishes, why do the plastics sometimes end up greasy?

Description : When I do the dishes, why do the plastics sometimes end up greasy?

Last Answer : answer:I've noticed that too, must have something to do with the grease sticking to the plastic more. I always use tons of soap and rinse really well as I also have a phobia about tasting soap. ... run it for the same reason and because somewhere, deep down, I think it is inferior to hand washing.

Diamond does not conduct electricity, because - (1) It's structure is very compact (2) It is of crystalline nature (3) There are only carbon atoms present in it (4) No free electrons are present in it

Description : Diamond does not conduct electricity, because - (1) It's structure is very compact (2) It is of crystalline nature (3) There are only carbon atoms present in it (4) No free electrons are present in it

Last Answer : (4) No free electrons are present in it Explanation: Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other car-bon atoms. There are no ... conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.

Diamond does not conduct electricity, because (1) It’s structure is very compact (2) It is of crystalline nature (3) There are only carbon atoms present in it (4) No free electrons are present in it

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Last Answer : No free electrons are present in it

Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their (A) Molecular sizes (B) Magnitude of intermolecular forces (C) Resistance to heat (D) Polymerisation mechanism

Description : Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their (A) Molecular sizes (B) Magnitude of intermolecular forces (C) Resistance to heat (D) Polymerisation mechanism

Last Answer : (B) Magnitude of intermolecular forces

Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800? (A) 50000 (B) 51600 (C) 49200 (D) 50800

Description : Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800? (A) 50000 (B) 51600 (C) 49200 (D) 50800

Last Answer : (A) 50000

Nylon-66 is so named because the (A) Average degree of polymerisation of the polymer is 1966 (B) Number of carbon atoms between two nitrogen atoms are 6 (C) Number of nitrogen atoms between two carbon atoms are 6 (D) Polymer was first synthesised in 1966

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Last Answer : (A) Average degree of polymerisation of the polymer is 1966

In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because(A) Temperature is less(B) Total pressure is less(C) Mixing of steam with the material being vaporised is not so intimate asto result in equilibrium condition(D) Saturated steam is used for steam distillation

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Last Answer : (C) Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition

The third law of thermodynamics states that the (A) Heat capacity of a crystalline solid is zero at absolute zero temperature (B) Heat transfer from low temperature to high temperature source is not possible without external work (C) Gases having same reduced properties behaves similarly (D) None of these

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Pick out the wrong statement. (A) The controlling resistance in case of heating of air by condensing steam is in the air film (B) The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature (C) In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs (D) Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature

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Last Answer : (C) In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs

"At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the (A) Third law of thermodynamics (B) Second law of thermodynamics (C) Nernst heat theorem (D) Maxwell's relations

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Last Answer : (A) Third law of thermodynamics

Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because (A) It is hygroscopic and explosive in nature (B) It is highly acidic in nature (C) It is a liquid at room temperature (D) Its nitrogen content is very less

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Last Answer : (A) It is hygroscopic and explosive in nature

A batch reactor is suitable for (A) Achieving cent percent conversion of reactants into products (B) Large scale gaseous phase reactions (C) Liquid phase reactions(D) Obtaining uniform polymerisation products in highly exothermicreactions

Description : A batch reactor is suitable for (A) Achieving cent percent conversion of reactants into products (B) Large scale gaseous phase reactions (C) Liquid phase reactions (D) Obtaining uniform polymerisation products in highly exothermic reactions

Last Answer : (C) Liquid phase reactions

Identify the correct statement with reference to the extractive metallurgy of aluminium. (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 (B) Approximately 80% of the aluminium deposited on the cathode comes from cryolite (C) Sodium is deposited along with aluminium, but is immediately vaporised (D) Anode effect sets in when the cryolite concentration goes below 40%.

Description : Identify the correct statement with reference to the extractive metallurgy of aluminium. (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 (B) Approximately 80% of ... is immediately vaporised (D) Anode effect sets in when the cryolite concentration goes below 40%.

Last Answer : (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3

Pick out the wrong statement. (A) In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2 (B) Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number (C) Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger (D) Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

Description : Pick out the wrong statement. (A) In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2 (B) Sherwood number in mass transfer corresponds to ... tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

Last Answer : (C) Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger

Visco-elastic behaviour exhibited by plastics is a __________ like behaviour. (A) Solid (B) Liquid (C) Combination of solid & liquid (D) Neither solid nor liquid

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Last Answer : (C) Combination of solid & liquid

Predict the entropy change in- (i) A liquid crystallizes into solid (ii) Temperature of a crystalline solid raised from 0K to 115K.

Description : Predict the entropy change in- (i) A liquid crystallizes into solid (ii) Temperature of a crystalline solid raised from 0K to 115K.

Last Answer : Ans. (i) Entropy decreases because molecules attain an ordered state. (ii) Entropy increases because from 0K to 115K average kinetic of moleculesincreases.

Melt spinning of polymers involves the forcing of polymer melt through spinnerates (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres. (A) Acrylic (B) Polyester (C) Nylon 6:6 (D) Polypropylene

Description : Melt spinning of polymers involves the forcing of polymer melt through spinnerates (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter ... the __________ fibres. (A) Acrylic (B) Polyester (C) Nylon 6:6 (D) Polypropylene

Last Answer : (A) Acrylic

. The physical state in which polymers exist is (A) Melts & rubber like state (B) Amorphous glassy state (C) Partially crystalline state (D) All (A), (B) and (C)

Description : . The physical state in which polymers exist is (A) Melts & rubber like state (B) Amorphous glassy state (C) Partially crystalline state (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Polycondensation reaction of polymerisation (A) Does not produce linear polymers (B) Produces only thermoplastic material (C) Produces epoxy polymers (D) Does not need any catalyst

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Last Answer : (C) Produces epoxy polymers

Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation(A) PVC(B) Bakelite(C) PTFE(D) Epoxy resin

Description : Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation (A) PVC (B) Bakelite (C) PTFE (D) Epoxy resin

Last Answer : (A) PVC

Thermosetting resins/polymers as compared to thermoplastic ones are (A) Soluble in all organic solvents (B) More brittle (C) Formed by addition polymerisation only (D) Easily reshaped & reused

Description : Thermosetting resins/polymers as compared to thermoplastic ones are (A) Soluble in all organic solvents (B) More brittle (C) Formed by addition polymerisation only (D) Easily reshaped & reused

Last Answer : (B) More brittle

A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture of (A) Siloxane elastomers (B) Polyamides (C) Vinyl polymers (D) Urea-formaldehyde resins

Description : A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved ... Siloxane elastomers (B) Polyamides (C) Vinyl polymers (D) Urea-formaldehyde resins

Last Answer : (D) Urea-formaldehyde resins

Polymerisation of poly functional monomers produces polymers having (A) Good mechanical strength (B) Low viscosity (C) Low melting point (D) None of these

Description : Polymerisation of poly functional monomers produces polymers having (A) Good mechanical strength (B) Low viscosity (C) Low melting point (D) None of these

Last Answer : (A) Good mechanical strength

Thermosetting polymers as compared to thermoplastic polymers (A) Are formed by addition polymerisation (B) Have three dimensional structure (C) Have linear structure (D) None of these

Description : Thermosetting polymers as compared to thermoplastic polymers (A) Are formed by addition polymerisation (B) Have three dimensional structure (C) Have linear structure (D) None of these

Last Answer : (B) Have three dimensional structure

Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids? (A) Starch (B) Cellulose (C) Proteins (D) Nucleic acids

Description : Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids? (A) Starch (B) Cellulose (C) Proteins (D) Nucleic acids

Last Answer : (C) Proteins

Define: i) Plastics ii) Polymers.

Description : Define: i) Plastics ii) Polymers. 

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Thermoplastic resins are those polymers, which (A) Has decreased plasticity at increasing temperature (B) Cannot be moulded (C) Easily deform under pressure at high temperature (D) None of these

Description : Thermoplastic resins are those polymers, which (A) Has decreased plasticity at increasing temperature (B) Cannot be moulded (C) Easily deform under pressure at high temperature (D) None of these

Last Answer : (C) Easily deform under pressure at high temperature

Which of the following is false? a) electricity is high-grade energy b) high grade forms of energy are highly ordered and compact c) low grade energy is better used for applications like melting of metals rather than heating water for bath

Description : Which of the following is false? a) electricity is high-grade energy b) high grade forms of energy are highly ordered and compact c) low grade energy is better used for applications like melting of metals rather than heating water for bath

Last Answer : c) low grade energy is better used for applications like melting of metals rather than heating water for bath

Pick out the correct statement. (A) Higher is the temperature of the radiating body, higher is the wavelength of radiation (B) Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder (C) The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature (D) Solid angle subtended by the finite surface at the radiating element is called the angle of incidence

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Last Answer : (B) Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder

Pick out the wrong statement. (A) Cold SBR is superior as compared to hot SBR (B) Polymerisation temperature can modify the properties of SBR (C) Production of cold SBR employs lower pressure as compared to that of hot SBR (D) None of these

Description : Pick out the wrong statement. (A) Cold SBR is superior as compared to hot SBR (B) Polymerisation temperature can modify the properties of SBR (C) Production of cold SBR employs lower pressure as compared to that of hot SBR (D) None of these

Last Answer : (D) None of these

Pick out the wrong statement(A) Cold rubber (SBR) is superior as compared to hot rubber (SBR)(B) Polymerisation temperature can modify the properties of SBR(C) Production of cold SBR employs lower pressure as compared to that ofhot SBR(D) None of these

Description : Pick out the wrong statement (A) Cold rubber (SBR) is superior as compared to hot rubber (SBR) (B) Polymerisation temperature can modify the properties of SBR (C) Production of cold SBR employs lower pressure as compared to that of hot SBR (D) None of these

Last Answer : (D) None of these

Pick out the correct statement about catalytic polymerisation. (A) H2SO4 polymerisation process gives gasoline rich in unsaturates (B) In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive (C) Both (A) and (B) (D) Neither (A) nor (B

Description : Pick out the correct statement about catalytic polymerisation. (A) H2SO4 polymerisation process gives gasoline rich in unsaturates (B) In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive (C) Both (A) and (B) (D) Neither (A) nor (B

Last Answer : (B) In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive