Related Questions

Which one of the following statements is not correct? Vulcanisation of rubber makes it
A Soft and flexible
B Strong and hard
C Chemical resistant
D Withstand higher temperatures
In vulcanisation process, rubber can be hardened by adding
A Nitrogen
B Silicon
C Sulphur
D Alcohol
__________ of rubber decreases after its vulcanisation.
A Resistance to the action of organic solvent
B Tackiness
C Maximum service temperature
D Tensile strength
Vulcanisation of rubber
A Decreases its tensile strength
B Increases its ozone & oxygen reactivity
C Increases its oil & solvent resistance
D Converts its plasticity into elasticity
Vulcanisation of rubber does not increase its
A Elasticity
B Plasticity
C Ductility
D None of these
Vulcanisation of raw rubber makes it
A Soft
B Less elastic
C Plastic
D Tacky
Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its
A Elasticity
B Strength
C Plasticity
D Weathering characteristics
Most commonly used rubber vulcanising agent is
A Sulphur
B Bromine
C Platinum
D Alumina
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?
A Ammonium alum
B Potassium alum
C Both A & B
D Neither A nor B
Styrene-butadiene-rubber (SBR) as compared to natural rubber has
A Poorer tensile strength
B Poorer resistance to oxidation
C Greater amount of heat build-up under heavy loading
D All of the above

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