Man-Made Materials — Set 2
Chemistry · मानव निर्मित सामग्री · Questions 11–20 of 50
Which synthetic rubber is commonly used for making wetsuits and gaskets?
Correct Answer: B. Neoprene
• **Neoprene** = Neoprene exhibits excellent chemical stability and maintains flexibility over a wide temperature range. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Buna-S; C: Buna-N; D: Thiokol
Which plastic is commonly used to make lightweight, transparent bottles for carbonated drinks?
Correct Answer: D. PET
• **PET** = PET stands for Polyethylene Terephthalate, which is a strong and lightweight form of polyester. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: HDPE; B: LDPE; C: PP
Which substance is used as a 'Plasticizer' to make hard plastics like PVC more flexible?
Correct Answer: D. Phthalates
• **Phthalates** = Phthalates are added to polymers to increase the space between chains, allowing them to slide past each other. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Benzene; B: Ethanol; C: Glycerol
The main component of optical fibers used in telecommunications is?
Correct Answer: B. Ultra-pure Silica
• **Ultra-pure Silica** = Ultra-pure silica allows light signals to travel long distances with minimal loss of intensity. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Lead crystal glass; C: Polymethyl methacrylate; D: Pure Copper
Which synthetic polymer is used to make disposable cups and packaging foam?
Correct Answer: D. Polystyrene
• **Polystyrene** = Polystyrene, often known by the brand name Styrofoam, is an excellent thermal insulator. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Polypropylene; B: Polycarbonate; C: Polythene
Terylene is a popular synthetic fiber belonging to which class of polymers?
Correct Answer: C. Polyesters
• **Polyesters** = The correct answer is 'Polyesters'. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Polyamides; B: Polyurethanes; D: Polyethers
Which material is used for making lenses of spectacles and camera filters?
Correct Answer: D. Flint glass
• **Flint glass** = Flint glass has a high refractive index and high dispersion, making it ideal for optical instruments. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Soda glass; B: Crookes glass; C: Pyrex glass
Which polymer is used as a substitute for glass in making bulletproof windows and aircraft canopies?
Correct Answer: D. Polycarbonate
• **Polycarbonate** = Polycarbonate is a tough, transparent plastic with very high impact resistance. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Polystyrene; B: PVC; C: Polyethylene
What is the primary ingredient of 'Safety Glass' used in car windshields?
Correct Answer: B. Laminated plastic layer
• **Laminated plastic layer** = Safety glass consists of a layer of plastic, usually polyvinyl butyral, sandwiched between two layers of glass. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Boron; C: Lead; D: Silver
Which synthetic material is used for making artificial turf (grass) in sports stadiums?
Correct Answer: A. Nylon or Polypropylene
• **Nylon or Polypropylene** = Nylon and polypropylene are chosen for their durability and resistance to wear and tear. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Rayon; C: Cotton-polyester blend; D: Natural rubber