All Free Chemical Engineering MCQs with Answers

• A. Polystyrene
• B. Poly chloroprene
• C. Polybutadiene
• D. Polyisoprene

Explanation: Natural rubber is chiefly cis-1,4-polyisoprene, formed from isoprene units.

• A. Polypropylene
• B. PVC
• C. Polythene
• D. Polyvinyl acetate

Explanation: Vinyl flooring uses sheets of polyvinyl chloride, whose durability, flexibility and resistance to moisture suit floor coverings.

• A. Cellulose nitrate
• B. Regenerated cellulose nitrate
• C. None of these
• D. Regenerated cellulose acetate

Explanation: Viscose rayon is regenerated cellulose produced by dissolving cellulose and regenerating it as fibres.

• A. Higher melting point
• B. Higher tensile strength
• C. None of these
• D. Lower density

Explanation: Branches prevent polymer chains from packing closely, so branched polymers generally have lower density than their linear counterparts.

• A. Bakelite
• B. Polythene
• C. Epoxy resin
• D. None of these

Explanation: Polythene is a thermoplastic that softens on heating and can be remoulded, allowing recycling and reuse.

• A. PVC
• B. Polythene
• C. Bakelite
• D. Teflon

Explanation: Bakelite is a phenol-formaldehyde copolymer made from two different monomers.

• A. A thermosetting material
• B. A condensation polymerisation product
• C. Made by employing emulsion polymerisation
• D. None of these

Explanation: PVC is an addition polymer and can be manufactured by emulsion polymerisation, although suspension polymerisation is also widely used…

• A. Epoxy resin
• B. Alkyd resin
• C. Polyamide
• D. Phenolic resin

Explanation: A saturated dicarboxylic acid reacting with a polyhydric alcohol forms a polyester resin; when modified with fatty acids or oils, it is…

• A. Polybutadiene
• B. Styrene butadiene rubber (SBR)
• C. Poly chloroprene
• D. Polyurethane

Explanation: Neoprene is the trade name for polychloroprene, produced by polymerising chloroprene. SBR and polybutadiene are different synthetic rubbers.

• A. Flexibility
• B. Chemical resistance
• C. Tensile strength
• D. All A., B. & C.

Explanation: Plasticisers reduce intermolecular attraction and increase chain mobility, making the polymer softer and more flexible.

• A. Dacron
• B. Cellulose
• C. Nylon
• D. None of these

Explanation: Tyre casings commonly use reinforcing cords made from nylon or polyester such as Dacron.

• A. Cellulose
• B. Lignin
• C. Pentogens
• D. None of these

Explanation: Bagasse mainly contains cellulose, together with lignin and pentosans, often misspelled here as “pentogens.” Since all three intended…

• A. Polyurethane
• B. Teflon
• C. Silicone rubber
• D. Epoxy resin

Explanation: Tetrafluoroethylene, C₂F₄, polymerises to polytetrafluoroethylene, or PTFE, widely known by the trade name Teflon.

• A. Unvulcanised raw rubber
• B. Natural rubber
• C. Highly vulcanised rubber
• D. Adhesive

Explanation: Ebonite is rubber containing a very high proportion of sulphur, typically about 25 to чи 40%, making it hard and rigid.

• A. -5
• B. 10-30
• C. 250-280
• D. 500-600

Explanation: Caprolactam ring-opening polymerisation to nylon-6 is carried out at about 250 to 280°C.

• A. Low density polyethylene (LDPE)
• B. High density polyethylene (HDPE)
• C. Polypropylene
• D. Unsaturated polyester

Explanation: LDPE has a highly branched molecular structure, giving it flexibility and allowing it to be formed into flexible pipes and tubing.

• A. Teflon
• B. SBR
• C. PTFE
• D. Polycrylates

Explanation: Buna-S is the styrene-butadiene rubber copolymer, abbreviated SBR. Teflon and PTFE are names for the fluoropolymer polytetrafluoroethylene.

• A. PVC
• B. Nylon-66
• C. Terylene
• D. Polystyrene

Explanation: Terephthalic acid reacts with ethylene glycol to form polyethylene terephthalate, commonly called Terylene.

• A. PVC
• B. Nylon
• C. Polystyrene
• D. None of these

Explanation: PVC tends to dehydrochlorinate and decompose on heating before it reaches a useful melting state.

• A. Bakelite
• B. Perspex
• C. Teflon
• D. PVC

Explanation: Teflon, or PTFE, has very low surface energy and excellent chemical and thermal resistance, so food does not readily stick to its coating.