Polymer and Plastics Engineering MCQs 2026

Degree of polymerization is

1. Anumber of repeat units in chain✓
2. Bonly crosslink density without units✓
3. Conly mold temperature✓
4. Donly extruder screw length✓

Injection molding melts polymer and

1. Aonly spins fibers✓
2. Bonly electroplates metal✓
3. Cinjects into closed mold under pressure✓
4. Donly distills monomer✓

PET is used commonly for

1. Aonly PVC pipes only always✓
2. Bonly natural rubber tires without blend✓
3. Conly concrete admixture✓
4. Dbottles and fibers✓

Addition polymerization requires

1. Astoichiometric diacid and diol condensation always✓
2. Bunsaturated monomers or ring opening without byproduct removal✓
3. Conly ionic crystal growth✓
4. Donly distillation trays✓

Glass transition temperature Tg is

1. Amelting of crystals only always✓
2. Btemperature where amorphous polymer transitions from glassy to rubbery✓
3. Cboiling of monomer only✓
4. Ddecomposition always✓