Question is ⇒ Cross linked polymers are, Options are ⇒ (A) thermoplastic, (B) thermosetting, (C) either (a) or (b), (D) fibres only, (E) , Leave your comments or Download question paper.

Question is ⇒ Cross linked polymers are, Options are ⇒ (A) thermoplastic, (B) thermosetting, (C) either (a) or (b), (D) fibres only, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Cross linked polymers are
A.	thermoplastic [Wrong Answer]
B.	thermosetting [Correct Answer]
C.	either (a) or (b) [Wrong Answer]
D.	fibres only [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : B 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 :

⇒ Addition of stabiliser during PVC manufacture is done to
improve its impact strength.
improve its elasticity.
reduce the melt viscosity & glass transition temperature.
prevent its thermal degradation.

⇒ Low pressure Zeigler process of polythene manufacture
employs a pressure of 30 kgf/cm².
achieves an yield of 95-98% based on ethylene.
produces very low density polythene.
does not use any catalyst for polymerisation.

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

⇒ Thermosetting materials
are cross-linked molecules.
soften on application of heat.
are solvent soluble.
none of these.

⇒ 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.

⇒ Visco-elastic behaviour exhibited by plastics is a __________ like behaviour.
solid
liquid
combination of solid & liquid
neither solid nor liquid

⇒ Polypropylene compared to polythene is
harder
stronger
lighter
all (a), (b) and (c)

⇒ __________ is a copolymer.
Nylon-66
Polyrophylene
PVC
Poly tetra flouro ethylene

⇒ Commercial production of polypropylene employs __________ polymerisation.
emulsion
suspension
solution
bulk

⇒ Acrylonitrile is mainly used in the __________ industry.
polymer
printing
dyeing
photographic

⇒ Hot drink (e.g, tea) cups are usually made of
polystyrene
polythene
polypropylene
PVC

⇒ 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.

⇒ Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its
elasticity
strength
plasticity
weathering characteristics

⇒ Pick out the wrong statement.
Linear polymers are formed from bifunctional groups only and are normally thermoplastic.
Cross-linked branched chain polymers are either elastometric or thermosetting.
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.
Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction.

⇒ Buna-S is a __________ material.
fibrous
plastic
resinous
rubbery

⇒ Plastic tubes & pipes are generally made by __________ moulding.
injection
transfer
extrusion
compression

⇒ Orlan fibre which is used as a wool sub stitute is
an amorphous polymer.
a natural polymeric fibre.
polyacrylonitrile.
polymethylmethacrylate (PMMA).

⇒ Polyvinyl chloride (PVC)
is produced by polycondensation reaction.
uses either emulsion or suspension polymerisation methods.
can be made thermosetting by adding a plasticiser.
softening temperature is 200°C.

⇒ Polymerisation process in which two or more monomers of chemically different nature take part is called
copolymerisation
addition polymerisation
chain polymerisation
none of these

⇒ In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
hexamethylene diamine and the ring.
hexamethylene diamine and the adipic acid.
adipic acid and the ring.
none of these.

⇒ Which of the following is a copolymer ?
Polystyrene
SBR
P.T.F.E.
Polypropylene

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

⇒ The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is
polyvinyl alcohol
polyvinyl acetale
polyvinyl butyral
PVC

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

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

⇒ Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids ?
Starch
Cellulose
Proteins
Nucleic acids

⇒ 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
-5
43038
250-280
500-600

⇒ Properties of a polymer is affected by the
chain length.
intermolecular forces.
branching & cross-linking.
all (a), (b).

⇒ Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?
Ammonium alum
Potassium alum
both a & b
neither a nor b

⇒ Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their
molecular sizes.
magnitude of intermolecular forces.
resistance to heat.
polymerisation mechanism.