Question29:-Polydispersity index is said to be 1 when

A:-Mw = Mn

B:-Mw > Mz

C:-Mz > Mz+1

D:-None of these

Correct Answer:- Option-A
Question30:-In emulsion polymerization technique, the polymerization takes place in

A:-Water phase

B:-Monomer phase

C:-Water/Monomer interphase

D:-Micelle

Correct Answer:-Question Cancelled
Question31:-Thermoplastic polyurethane is a

A:-Thermoplastic

B:-Elastomer

C:-Thermoplastic elastomer

D:-Thermoset

Correct Answer:- Option-C
Question32:-For EPDM the unsaturation is in the

A:-Main chain

B:-Branches

C:-Pendent groups

D:-All of these

Correct Answer:- Option-C
Question33:-The monomers of butyl rubber are

A:-Butadiene and isoprene

B:-Butadiene and 1-butene

C:-Isoprene and 1-butene

D:-None of these

Correct Answer:- Option-D
Question34:-The property that is lowered by increasing CN content of NBR is

A:-Oil resistance

B:-Low temperature flexibility

C:-High temperature resistance

D:-None of these

Correct Answer:- Option-B
Question35:-The EPM is not cured by

A:-Sulphur

B:-Peroxide

C:-Radiation

D:-Oxime

Correct Answer:- Option-A
Question36:-Fluorocarbons are known for

A:-High temperature resistance

B:-Ozone resistance

C:-Oil resistance

D:-All of these

Correct Answer:- Option-D
Question37:-Nylon 66 melts at (deg C)

A:-219

B:-249

C:-269

D:-289

Correct Answer:- Option-C
Question38:-In unsaturated polyester the monomer that is commonly used to give crosslinking sites is

A:-Fumaric acid

B:-Terephthalic acid

C:-ltaconic acid

D:-Maleic anhydride