Related Questions

Plasticisers are added to polymers to improve their
A Tensile strength
B Softness & flexibility
C Acid resistance
D Alkali resistance
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 of the above
Plasticisers are added to synthetic plastics to
A Impart flexibility
B Improve workability during fabrication
C Develop new improved properties not present in the original resin
D All of the above
Plasticisers are added to paints to
A Make it corrosion resistant
B Make glossy surface
C Give elasticity & prevent cracking of the film
D Increase atmospheric oxidation
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
A teacher's duty is not just to impart information to the student, but also to rouse their curiosity. Choose the meaning of impart.
A import
B export
C give away
D pass on
Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
A Film
B Nucleate
C Transition
D All of the above
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.
A Film
B Nucleate
C Transition
D All of the above
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A Cracking
B Fractional distillation
C Full distillation
D Carbonisation
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
A Nucleate
B Local
C Pool
D Saturated

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