Man-Made Materials — Set 1
Chemistry · मानव निर्मित सामग्री · Questions 1–10 of 50
Which synthetic polymer is commonly used for making non-stick coating on cooking utensils?
Correct Answer: A. Teflon
• **Teflon** = Teflon is used for non-stick surfaces because it has very low friction and is resistant to heat. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Polystyrene; C: PVC; D: Bakelite
Which type of plastic cannot be remoulded upon heating once it has been set?
Correct Answer: D. Thermosetting plastics
• **Thermosetting plastics** = Thermosetting plastics undergo a chemical change during molding that creates permanent cross-links between chains. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Linear polymers; B: Elastomers; C: Thermoplastics
What is the primary raw material used for the commercial production of Rayon?
Correct Answer: D. Cellulose
• **Cellulose** = Rayon is produced from natural cellulose found in wood pulp or cotton linters. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Coal; B: Petroleum; C: Formaldehyde
Which of the following is the first fully synthetic fiber made by man?
Correct Answer: D. Nylon
• **Nylon** = Nylon was developed in the 1930s without using any natural raw materials like plant fibers. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Rayon; B: Acrylic; C: Polyester
Which plastic is widely used for manufacturing electrical switches and handles of pressure cookers?
Correct Answer: A. Bakelite
• **Bakelite** = Bakelite is a poor conductor of electricity and heat, making it safe for electrical and kitchen use. • **first** — It was the first plastic made from synthetic components • 💡 Wrong-option analysis: B: PVC; C: Nylon; D: Polyethylene
The monomer unit used to produce the polymer Polyvinyl Chloride (PVC) is?
Correct Answer: B. Vinyl chloride
• **Vinyl chloride** = Vinyl chloride molecules undergo polymerization to form the long-chain PVC polymer. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Propylene; C: Ethylene; D: Styrene
Which material is known as 'artificial wool' because of its warmth and texture?
Correct Answer: D. Acrylic
• **Acrylic** = Acrylic fibers are lightweight, soft, and warm, mimicking the properties of natural wool. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Nylon; B: Rayon; C: Dacron
What substance is added to natural rubber during 'vulcanization' to improve its strength?
Correct Answer: B. Sulfur
• **Sulfur** = Sulfur creates cross-links between rubber polymer chains during the heating process. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Phosphorus; C: Carbon; D: Nitrogen
Which polymer is used to manufacture bulletproof vests and high-performance sports gear?
Correct Answer: D. Kevlar
• **Kevlar** = Kevlar is a heat-resistant and strong synthetic fiber with high tensile strength. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Lexan; B: Teflon; C: Neoprene
The variety of glass used in making laboratory equipment like beakers and flasks is?
Correct Answer: D. Pyrex glass
• **Pyrex glass** = Pyrex, or borosilicate glass, has a very low coefficient of thermal expansion. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Flint glass; B: Safety glass; C: Soda glass