What is natural rubber primarily made from?
B
Latex from rubber trees
Analysis & Theory
Natural rubber is obtained from *latex, a milky fluid from rubber trees* (Hevea brasiliensis).
Which monomer is used to make synthetic rubber?
Analysis & Theory
Synthetic rubber is often made by polymerizing *styrene and butadiene* (SBR) or other monomers like isoprene.
Which type of polymerization is involved in synthetic rubber production?
A
Condensation polymerization
B
Addition polymerization
C
Step-growth polymerization
D
Cross-linking polymerization
Analysis & Theory
Synthetic rubber is prepared by *addition polymerization* of monomers like butadiene.
What is vulcanization of rubber?
A
Mixing rubber with water
B
Heating rubber with sulfur to improve elasticity and strength
C
Dissolving rubber in alcohol
Analysis & Theory
Vulcanization involves *heating rubber with sulfur*, which forms cross-links between polymer chains to improve strength and elasticity.
Which of the following is a common use of natural rubber?
A
Tires, footwear, gloves
Analysis & Theory
Natural rubber is used in *tires, shoes, gloves, and elastic bands* due to its flexibility and resilience.
Which of the following is a common use of synthetic rubber?
A
Tires, conveyor belts, gaskets
Analysis & Theory
Synthetic rubbers like SBR are used in *tires, conveyor belts, hoses, and gaskets*.
Which property of rubber makes it suitable for making tires?
A
Elasticity and resilience
B
Hardness and brittleness
D
Electrical conductivity
Analysis & Theory
Rubber’s *elasticity, resilience, and abrasion resistance* make it ideal for tires.
Which of the following is a disadvantage of natural rubber?
A
Prone to aging and attack by microorganisms
Analysis & Theory
Natural rubber can *degrade on exposure to oxygen, ozone, heat, and microorganisms*.
Vulcanized rubber is:
B
Hard, elastic, and durable
D
Easily soluble in water
Analysis & Theory
Vulcanized rubber becomes *harder, more elastic, durable, and heat-resistant*.
Which type of plastic is rubber classified as?
Analysis & Theory
Rubber is an *elastomer*, which is a polymer with high elasticity.