Question is ⇒ Vulcanisation of rubber does not increase its, Options are ⇒ (A) softness, (B) oxidation resistance, (C) weight & strength, (D) elasticity & water solubility, (E) , Leave your comments or Download question paper.

Question is ⇒ Vulcanisation of rubber does not increase its, Options are ⇒ (A) softness, (B) oxidation resistance, (C) weight & strength, (D) elasticity & water solubility, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Vulcanisation of rubber does not increase its
A.	softness [Correct Answer]
B.	oxidation resistance [Wrong Answer]
C.	weight & strength [Wrong Answer]
D.	elasticity & water solubility [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A 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 :

⇒ Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from __________ resins.
epoxy
phenol formaldehyde
urea formaldehyde
melamine formaldehyde

⇒ Polycondensation reaction of polymerisation
does not produce linear polymers.
produces only thermoplastic material.
produces epoxy polymers.
does not need any catalyst.

⇒ Valcunisation of rubber decreases its
tensile strength.
resistance to organic solvents.
tackiness.
working temperature range.

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

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

⇒ Which of the following is stretched into fibres ?
Saturated polyester
Unsaturated polyester
Isoprene
Bakelite

⇒ Flexible foam (for mattresses) are usually made of
PVC
silicone rubber
polyurethanes
polyamides

⇒ A copolymer is formed by the combination of two or more monomer molecules
in a chain without the elimination of water.
with the elimination of small amount of water.
of the same monomer by elimination of small molecules of water.
none of these.

⇒ Neoprene is chemically known as
polybutandiene
styrene butadiene rubber (SBR)
polyurethane
poly chloroprene

⇒ Teflon is
phenol formaldehyde
an inorganic polymer
polytetra florouethylene (PTFE)
a monomer

⇒ 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.

⇒ Which of the following is a natural polyamide fibre.
Wool
Silk
Cotton
None of these

⇒ Which of the following is not a thermoplastic material ?
Epoxy polymer
PVC
Polystyrene
Polythene

⇒ Nylon 6, 10 which is used for bristles making is superior to nylon 6, 6 due to its lower water absorption capacity, is a/an
polyester
polyamide
polyisoprene
polystyrene

⇒ Terylene is
same as dacron
a polyester
both(a) & (b)
neither (a) nor (b)

⇒ Pick out the wrong statement.
Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre.
Crimp is a measure of the difference between the length of the straightened and unstraightend fibre.
Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning.
Nylon fibres have greater water absorption capacity than polyester fibres.

⇒ Collapsible tubes for tooth paste are produced by __________ extrusion.
direct
indirect
impact
none of these

⇒ Pick out the wrong statement.
Polystyrene is a thermoplastic polymer.
Protein is a natural polymer.
Neoprene is a natural rubber.
Polythene is a copolymer, while SBR is a homopolymer.

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

⇒ Which of the following is not a natural fibre?
Silk
Viscose rayon
Wool
Cotton

⇒ 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.

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

⇒ 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.

⇒ Addition polymerisation is not involved in the manufacture of
low density polythene.
poly vinyl chloride.
polystyrene.
polyhexamethylene adipamide.

⇒ Trade name of __________ is neoprene.
polychloroprene
polyisoprene
polytetraflouroethylene
poly vinyl acetate

⇒ Phenol formaldehyde
employs addition polymerisation.
employs condensation polymerisation.
is a monomer.
is an abrasive material.

⇒ Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is
nylon-66
teflon
polyester
bakelite

⇒ Bakelite (phenol-formaldehyde) resin can not be used as
decorative paint.
decorative laminates.
electrical insulation.
glass reinforced plastics.

⇒ Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?
Ethylene glycol
Stearic acid estors
Tricresyl phosphate
Esters of phthalic acid

⇒ Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m². Which of the following polymers has the maximum film elongation (of the order of 100%) ?
Water impermeable cellophane
Polythene
Cellulose acetate
Teflon