Thermocol (expanded polystyrene) is not used for __________________? A. Low temperature thermal insulation as in refrigerator and air conditioners B. Acoustic control and ceiling for buildingC. High temperature thermal insulation in furnaces D. Packing of delicate electronic gadgets

Most commonly used rubber vulcanisation agent is __________________? A. Sulphur B. Bromine C. Platinum D. Alumina

Liners of bags are usually made of ____________________? A. Polythene B. PVCC. Polypropylene D. Polyesters

______________ is an addition polymer ? A. Nylon B. BakeliteC. Polythene D. None of these

Which of the following is an elastomer ? A. Thiokol B. Phenol formaldehyde C. Urea formaldehyde D. Polystyrene

Plastic tubes & pipes are generally made by ______________ moulding? A. Injection B. TransferC. Extrusion D. Compression

Diphenylamine is added to rubber to_________________? A. Vulcanise itB. Protect it from deterioration on exposure to air C. Make it non-inflammable D. Make it thermosetting

Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about ______________ ° C? A. -20B. 50 C. 250 D. 500

Plastic articles are normally produced by _____________ moulding? A. Green sandB. Injection C. Shell D. Dry sand

Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is_______________________? A. Ni B. V2O5 C. FeD. Aluminium triethyl combined with titanium tetrachloride