Q1. Which of the following is a natural polymer that serves as a primary raw material for rubber production?
a) Cellulose
b) Nylon
c) Latex
d) Polyethylene
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Correct Answer: c) Latex
Explanation: Latex is a milky sap obtained from the rubber tree (Hevea brasiliensis) and contains natural rubber polymer. It serves as a primary raw material for rubber production, undergoing various processing techniques to form solid rubber products.
Q2. What is the primary chemical component of natural rubber?
a) Ethylene
b) Propylene
c) Isoprene
d) Butadiene
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Correct Answer: c) Isoprene
Explanation: Natural rubber primarily consists of poly isoprene, a polymer composed of repeating units of isoprene monomers. Isoprene molecules link together through covalent bonds to form long chains, giving natural rubber its elastic properties.
Q3. Which process involves treating natural rubber with sulfur to improve its mechanical properties?
a) Vulcanization
b) Polymerization
c) De-polymerization
d) Oxidation
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Correct Answer: a) Vulcanization
Explanation: Vulcanization is a chemical process in which natural rubber is treated with sulfur and heated to improve its mechanical properties, such as elasticity, strength, and durability. This process cross-links rubber molecules, resulting in a network structure that enhances its resilience and resistance to heat and chemicals.
Q4. Which type of rubber is commonly used in tire manufacturing due to its excellent wear resistance and grip?
a) Natural rubber
b) Butyl rubber
c) Neoprene rubber
d) Styrene-butadiene rubber (SBR)
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Correct Answer: d) Styrene-butadiene rubber (SBR)
Explanation: Styrene-butadiene rubber (SBR) is a synthetic rubber derived from styrene and butadiene monomers. It is widely used in tire manufacturing due to its excellent wear resistance, abrasion resistance, and grip on various road surfaces.
Q5. Which synthetic rubber is known for its outstanding resistance to heat, ozone, and weathering, making it suitable for automotive seals and gaskets?
a) Butyl rubber
b) Neoprene rubber
c) Nitrile rubber
d) EPDM rubber
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Correct Answer: d) EPDM rubber
Explanation: Ethylene propylene diene monomer (EPDM) rubber is a synthetic rubber known for its excellent resistance to heat, ozone, weathering, and environmental exposure. It is commonly used in automotive seals, gaskets, roofing membranes, and electrical insulation due to its durability and flexibility.
Q6. Which rubber exhibits low gas permeability, making it suitable for tire inner tubes and pharmaceutical stoppers?
a) Neoprene rubber
b) Butyl rubber
c) Nitrile rubber
d) Silicone rubber
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Correct Answer: b) Butyl rubber
Explanation: Butyl rubber is a synthetic rubber characterized by its low gas permeability, high resistance to heat, and excellent sealing properties. It is commonly used in tire inner tubes, automotive hoses, pharmaceutical stoppers, and other applications requiring gas and moisture resistance.
Q7. What is the primary advantage of using synthetic rubber over natural rubber in certain applications?
a) Higher elasticity
b) Lower cost
c) Greater environmental sustainability
d) Enhanced chemical resistance
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Correct Answer: d) Enhanced chemical resistance
Explanation: Synthetic rubber offers advantages such as enhanced chemical resistance, oil resistance, and temperature stability compared to natural rubber. These properties make synthetic rubber suitable for applications where exposure to harsh chemicals, oils, or extreme temperatures is a concern.
Q8. Which type of rubber is commonly used in the production of wetsuits, orthopedic braces, and electrical insulation due to its resistance to oil and chemicals?
a) Nitrile rubber
b) Neoprene rubber
c) Silicone rubber
d) Polyurethane rubber
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Correct Answer: b) Neoprene rubber
Explanation: Neoprene rubber, also known as polychloroprene rubber, is valued for its resistance to oil, chemicals, and weathering, as well as its flexibility and durability. It finds applications in wetsuits, orthopedic braces, gaskets, seals, and electrical insulation.
Q9. Which type of rubber is commonly used in the automotive industry for engine seals, hoses, and gaskets due to its resistance to oil and fuel?
a) Butyl rubber
b) EPDM rubber
c) Nitrile rubber
d) Polyurethane rubber
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Correct Answer: c) Nitrile rubber
Explanation: Nitrile rubber, also known as NBR or Buna-N rubber, is valued for its excellent oil and fuel resistance, making it suitable for automotive applications such as engine seals, hoses, gaskets, and fuel system components.
Q10. Which property of rubber makes it suitable for vibration isolation mounts, shock absorbers, and anti-vibration pads?
a) High tensile strength
b) Low compression set
c) High resilience
d) Low elongation at break
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Correct Answer: c) High resilience
Explanation: Rubber exhibits high resilience, meaning it can deform under stress and return to its original shape when the stress is removed. This property allows rubber to absorb energy and dampen vibrations, making it ideal for vibration isolation mounts, shock absorbers, and anti-vibration pads.