Free Chemical Process Principles MCQs with Answers

• A. Cannot be melted after forming
• B. Is useful for melt casting
• C. Can be repeatedly melted
• D. Is useful for spinning

Explanation: Thermosetting plastics form permanent cross-linked networks during curing, so they cannot be melted and reshaped after forming.

• A. Direct
• B. Impact
• C. Indirect
• D. None of these

Explanation: Collapsible tubes are made by impact extrusion, in which a rapidly moving punch forces the metal or polymer blank to flow around it and…

• A. Thermoplastic
• B. Glass like transparent
• C. Linear
• D. Thermosetting

Explanation: PMMA is a linear thermoplastic that softens on heating and is valued for its glass-like transparency.

• A. PVC
• B. Bakelite
• C. PTFE
• D. Epoxy resin

Explanation: PVC can be manufactured by bulk, solution, suspension, and emulsion routes, although suspension polymerisation is especially common…

• A. Molecular sizes
• B. Polymerisation mechanism
• C. Resistance to heat
• D. Magnitude of intermolecular forces
• E. Answer: Option B

Explanation: The properties that distinguish thermoplastics, thermosets, elastomers and fibres mainly depend on the strength of intermolecular forces…

• A. Addition polymer
• B. Poly amide
• C. None of these
• D. Homopolymer

Explanation: Terylene is polyethylene terephthalate, a polyester formed by condensation polymerisation.

• A. PVC
• B. Neoprene
• C. Polyurethane
• D. SBR

Explanation: PVC is flexible, water-resistant and readily fabricated into thin sheets, making it a common raincoat material.

• A. Silk
• B. Viscose rayon
• C. Wool
• D. Cotton

Explanation: Viscose rayon is a regenerated cellulose fibre made by chemically processing cellulose, so it is manufactured rather than naturally…

• A. Polyester
• B. Polyamide
• C. Cellulosic
• D. Natural

Explanation: Rayon is produced from dissolved and regenerated cellulose, usually obtained from wood pulp.

• A. Cyclohexane
• B. Ethyl benzene
• C. Ethylene glycol
• D. DMT

Explanation: Caprolactam is manufactured through the cyclohexane to cyclohexanone and oxime route, followed by Beckmann rearrangement.

• A. Bakelite
• B. Nylon-66
• C. Epoxy resin
• D. Silicone rubber

Explanation: Polyhexamethylene adipamide is formed from hexamethylenediamine and adipic acid and is conventionally called Nylon-66.

• A. Do not soften on application of heat
• B. Are heavily branched molecules
• C. None of these
• D. Are solvent insoluble

Explanation: Thermoplastics soften on heating and are usually linear or lightly branched; many can also dissolve or swell in suitable solvents.

• A. Thermoplastic
• B. Fibres only
• C. Either A. or B.
• D. Thermosetting

Explanation: Cross-linking joins polymer chains into a permanent three-dimensional network, so the material cannot be remelted and reshaped like a…

• A. Lower melting point
• B. More abrasion resistant properties
• C. Higher hardness
• D. All A., B. and C.

Explanation: Nylon-66 generally offers better abrasion resistance than nylon-6, making it useful where wear resistance is important.

• A. Phenol formaldehyde resins
• B. Cross linked polystyrene
• C. Polyesters
• D. Polyamides

Explanation: Cross-linked polystyrene is normally produced by chain-growth addition polymerisation of styrene with a cross-linking agent such as…

• A. Butyl rubber
• B. Silicon rubber
• C. Nitrile rubber
• D. Silicone rubber

Explanation: Silicone rubber remains flexible over an unusually broad temperature range, approximately -75 to 275°C.

• A. Polypropylene
• B. Polyurethane
• C. Polyester
• D. Polystyrene

Explanation: Polystyrene is lightweight, electrically insulating and easily moulded, which makes it suitable for refrigerator components and transistor…

• A. Polyacrylonitrile
• B. Polyamide
• C. Saturated polyester
• D. Alkyd resin

Explanation: Acrilan is a trade name associated with polyacrylonitrile fibres. The nitrile groups give these fibres a hard, strong material suitable…

• A. Coated fabrics
• B. Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
• C. Gaskets
• D. Soles of shoes

Explanation: SBR is widely used in tyres, shoe soles, gaskets and coated fabrics, but it lacks the specialised strength and durability required for…

• A. Extrusion
• B. Mastication
• C. Vulcanisation
• D. Calendaring

Explanation: Calendaring passes rubber through heated rollers to form thin sheets or press it onto fabric.