Related Questions

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
A Low impact strength
B High flexibility
C Better finish and surface appearance
D High plastic deformation
The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.
A Greater than
B Lower than
C Is same as
D Half
In the method of condensation polymerization,
A Low-molecular substances are removed from the high molecular substance
B The reaction proceeds with an evolution of ammonia
C The reaction proceeds with an evolution of hydrogen chloride
D All of the above
Thermosetting polymers as compared to thermoplastic polymers
A Are formed by addition polymerisation
B Have three dimensional structure
C Have linear structure
D None of these
Branched chair polymers as compared to linear polymers have
A Higher melting point
B Higher tensile strength
C Lower density
D None of these
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher
A Densities
B Melting point
C Tensile strength
D Hardness, rigidity & brittleness
Branched chain polymers compared to linear polymers have higher
A Density
B Tensile strength
C Melting point
D Degree of irregularity in atomic packing
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.
A Molal
B Relative
C Percentage
D None of these
The polymer obtained by the condensation of hexamethylene diamine and adipic acid is :
A Nylon 66
B Terylene
C Tollen's
D Bakelite
Which of the following polymers is obtained by copolymerisation of three monomers?
A SAN
B ABS
C SBR
D PTFE

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