Question is ⇒ Valcunisation of rubber decreases its, Options are ⇒ (A) tensile strength., (B) resistance to organic solvents., (C) tackiness., (D) working temperature range., (E) , Leave your comments or Download question paper.

Question is ⇒ Valcunisation of rubber decreases its, Options are ⇒ (A) tensile strength., (B) resistance to organic solvents., (C) tackiness., (D) working temperature range., (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Valcunisation of rubber decreases its
A.	tensile strength. [Wrong Answer]
B.	resistance to organic solvents. [Wrong Answer]
C.	tackiness. [Correct Answer]
D.	working temperature range. [Wrong Answer]
View Answer 1 -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 :

⇒ Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are
5°C and 1 kgf/cm².
- 20°C and 1 kgf/cm².
0°C and 1 kgf/cm².
0°C and 3 kgf/cm².

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

⇒ Vinyl flooring is done using __________ sheets.
polypropylene
PVC
polythene
polyvinyl acetate

⇒ Zeigler - Natta catalyst (AlR₃ - AlCl₃) is used in the polymerisation of
vinyl acetate
vinyl chloride
propylene
styrene

⇒ Polythene is a/an
addition polymerisation product.
condensation polymerisation product.
thermosetting material.
none of these.

⇒ Polyvinyl acetate is never used for making
moulded articles
fibres
adhesives
all (a), (b) & (c)

⇒ Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces
epoxy resin
polyamide
alkyd resin
phenolic resin

⇒ Pick out the wrong statement.
Addition polymers are generally formed by chain growth polymerisation.
Condensation polymers are generally formed by step growth polymerisation.
Teflon is formed by step growth polymerisation.
Bakelite is formed by step growth polymerisation.

⇒ Ion exchange resins are made of
lucite
sulphonated bakelite
polystyrene
teflon

⇒ Phenol formaldehyde is produced by condensation polymerisation. It is also known as
teflon
bakelite
polyester
nylon-66

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

⇒ The main use of butadiene is
as a plasticiser for unsaturated polyester.
in the manufacture of synthetic rubber.
as an anti-skimming agent in paint.
none of these.

⇒ Polymers are
micromolecules
macromolecules
sub-micromolecules
none of these

⇒ __________ is a homopolymer.
Neoprene
Bakelite
Nylon-66
Terylene

⇒ Which of the following is generally not used as eord for synthetic rubber tyre casing ?
Dacron
Nylon
Cellulose
None of these

⇒ Flexible plastic pipes are made of
high density polyethylene (HDPE).
low density polyethylene (LDPE).
polypropylene.
unsaturated polyester.

⇒ In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?
Bakelite (phenol formaldehyde)
Polyester
Polythene
Nylon-6

⇒ 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

⇒ The generic chemical name for the class of polymers which are commerically known as nylons is
polyolefins
polyamide
polyacrylate
polyurathane

⇒ In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is
terylene
polybutadiene
PVC
polypropylene

⇒ Vulcanisation of rubber does not increase its
softness
oxidation resistance
weight & strength
elasticity & water solubility

⇒ Polycaprolactum is also known as
nylon-66
nylon-6
teflon
SBR

⇒ Styrene butadiene rubber (SBR) is
a natural rubber.
another name of silicone rubber.
a synthetic polymer.
a synthetic monomer.

⇒ Vulcanisation of rubber
decreases its tensile strength.
increases its ozone & oxygen reactivity.
increases its oil & solvent resistance.
converts its plasticity into elasticity.

⇒ Neoprene is a
monomer
synthetic rubber
polyester
none of these

⇒ Catalyst used in the production of high density polythene by low pressure Ziegler process is
aluminium triethyl activated with TiCl₄
platinum
molybdenum
Nickel

⇒ The rate controlling step in the manufacture of silicone rubber is the
polymer termination step.
condensation of siloxane to silicone.
initial hydrolysis of silicone monomer.
none of these.

⇒ Polyhexamethylene adipimide is also known as
bakelite
nylon-66
epoxy resin
silicone rubber

⇒ Styrene butadiene rubber (SBR) as compared to natural rubber has
poor tensile strength.
poorer resistance.
greater amount of heat build up heavy loading.
all (a), (b) ana (c).

⇒ Cellulose content in bomboo fibre is about __________ percent.
10
20
50
85