Density of low density polythene is about ____________ gm/c.c?
Density of low density polythene is about ____________ gm/c.c?
A. 0.38
B. 0.56
C. 0.81
D. 0.91
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Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its__________________?
Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its__________________?A. Tensile strength
B. Chemical resistance
C. Flexibility
D. All A., B. & C.Condensation polymerisation is not involved in the manufacture of_________________?
Condensation polymerisation is not involved in the manufacture of_________________?A. Teflon
B. Polythene
C. Terylene
D. NylonIn a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ?
In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ?A. PTFE
B. Buna-S
C. PMMA
D. PolycaprolactamWhich of the following is an inorganic polymer ?
Which of the following is an inorganic polymer ?A. Teflon
B. Perspex
C. Silicones
D. Bakelite_____________ moulding is used for shaping of thermosetting plastics exclusively?
_____________ moulding is used for shag of thermosetting plastics exclusively?A. Compression
B. Injection
C. Transfer
D. ExtrusionPlasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?
Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?A. Ethylene glycol
B. Stearic acid estors
C. Tricresyl phosphate
D. Esters of phthalic acid