Question is ⇒ Plastic tubes & pipes are generally made by __________ moulding., Options are ⇒ (A) injection, (B) transfer, (C) extrusion, (D) compression, (E) , Leave your comments or Download question paper.

Question is ⇒ Plastic tubes & pipes are generally made by __________ moulding., Options are ⇒ (A) injection, (B) transfer, (C) extrusion, (D) compression, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Plastic tubes & pipes are generally made by __________ moulding.
A.	injection [Wrong Answer]
B.	transfer [Wrong Answer]
C.	extrusion [Correct Answer]
D.	compression [Wrong Answer]
View Answer 2 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Diphenylamine is added to rubber to
valcanise it.
protect it from deterioration on exposure to air.
make it non-inflammable.
make it thermosetting.

⇒ Which of the following is not the commercial name of polymethylmethacrylate (PMMA) ?
Perspex
Lucite
Plexiglass
Teflon

⇒ Which of the following is not a condensation polymer ?
Bakelite
Melamine polymer
Polymethylmethacrylate (PMMA)
None of these

⇒ Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
glycerol
nitro cellulose
camphor
none of these

⇒ The repeating units of PTFE are
Cl₂CH-CH₃
F₂ C = CF₂
F₃ C-CF₃
FClC = CF₂

⇒ Which of the following has the weakest intermolecular forces ?
Polyisoprene
Nylon-66
Polystyrene
Bakelite

⇒ Nylon 6 as compared to nylon 6, 6 has lower
abrasion resistance.
thermal stability.
adhesion to rubber.
hardness.

⇒ In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres.
polythene
PVC
rayon
polyvinyl acetate

⇒ Which of the following polymers has the tendency of decomposing before melting ?
Polystyrene
Nylon
PVC
None of these

⇒ Nylon-66 is manufactured from
adipic acid and hexamenthylene diamine.
caprolactum.
maleic anhydride and hexamethylene diamine.
dimethyl terephthalate (DMT) and ethylene glycol.

⇒ In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of
cross linked polystyrene.
phenol formaldehyde resins.
polyesters.
polyamides.

⇒ Thermocole (expanded polystyrene) is not used for
low temperature thermal insulation as in refrigerator and air conditioners.
accoustic control and ceiling for building.
high temperature thermal insulation in furnaces.
packing of delicate electronic gadgets.

⇒ Which of the following is a polymer of hexamethylene diamine and adipic acid ?
Nylon-6
Nylon-66
Nylon-6, 10
Epoxy resin

⇒ Density of high density polythene is about __________ gm/c.c.
1.18
1.05
0.95
0.99

⇒ Condensation polymerisation of __________ produces bakelite.
propylene
phenol & formaldehyde
phenol & acetaldehyde
urea & formaldehyde

⇒ Rain coats are made of
neoprene
PVC
polyurathane
SBR

⇒ 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 ?
50000
51600
49200
50800

⇒ Polyvinyl alcohol is used as a
cation/anion exchanger.
water soluble adhesive.
textile fibre.
non-sticky coating on frying pans.

⇒ Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to
protect rubber goods from attack by oxygen & ozone present in the atmosphere.
reduce its viscosity to permit easier processing.
reduce the time of vulcanisation and quantity of vulcanising agent.
increase its viscosity.

⇒ Which of the following additives are added to plastics to make it impervious to X-rays ?
Asbestos
Barium salt
Carborundum
Phthalic acid

⇒ Most of the plastics are safe to be used upto a maximum temperature of __________ °C.
100
150
350
450

⇒ Lavatory cisterns are normally made of
expanded polystyrene
saturated polyester
perspex
PVC

⇒ __________ polymer is used for making unbreakable crockery.
Thermoplastic
Melamine
Addition
none of these

⇒ Polycaprolactum is nothing but
orlon
nylon 6, 6
nylon 6
saran

⇒ Nitrile rubber is produced by the polymerisation of
acrylonitrile & butadiene.
acrylonitrile & styrene.
isobutylene & isoprene.
none of these.

⇒ Pick out the wrong statement.
For the manufacture of styrene, the major raw materials are benzene and ethylene.
One inportant copolymer of styrene is SBR, which is widely used in the manufacture of automobile tyres.
Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis.
Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available.

⇒ SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at
0.04375
0.125694444444444
0.0430555555555556
0.0840277777777778

⇒ Polyesters are manufactured by the polycondensation reaction of
dibasic acid with dihydric alcohol.
a single monomer.
carboxylic acid with ethylene.
inorganic acid with ethylene glycol.

⇒ Viscosity of a polymer solution or melt
decreases with increase in molecular weight.
decreases with increase in temperature.
increases with increase in temperature.
does not vary with temperature rise.

⇒ Thermosetting resins/polymers as compared to thermoplastic ones are
soluble in all organic solvents.
more brittle.
formed by addition polymerisation only.
easily reshaped & reused.