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
Low quality of jute fibre is attributed to
1. Discoloration of fibre
2. Very short fibre strands
3. Reduction of cellulose in fibre
4. Reduction of cell wall strength over-retting decreases the fibre quality due to
Select the correct answer:
Paper making polymers can be categorized as naturally occurring polymers, modified naturally occurring polymers, and synthetic polymers.
Consider the following statements.
1. Fibre optics is based on the principle of total internal reflection.
2. In an optical fibre communication system, power consumption is extremely low
3. Optical fibre communications are free from radio frequency interference.
4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre.
Which of these statements are correct?
A glass fibre reinforced epoxy composite is made with 60 wt.% unidirectional continuous glass fibres. The elastic moduli of the glass fibre and the epoxy matrix are 72.5 and 2.4 GPa, respectively. What is the elastic modulus of this composite along the fibre direction, in GPa? The densities of glass fibre and epoxy are 2.58 g/cm3 and 1.14 g/cm3, respectively
For amorphous and semi-crystalline polymers, mixing leads to the formation of ____________
S1:Metals are today being replaced by polymers in many applications.
P :Above all, they are cheaper and easier to process making them a viable alternative to metals.
Q :Polymers are essentially a long chains of hydrocarbon molecules.
R :Today polymers as strong as metals have been developed.
S :These have replaced the traditional chromium-plated metallic bumpers in cars.
S6:Many Indian Institutes of science and Technology run special programmes on polymer science.

The Proper sequence should be:
Polyvinyl alcohol is atactic in nature and hence amorphous. Therefore, it cannot be used as crystalline fibres. State true or false.
In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: No rubber are plastic Statement II: All polymers are rubber Conclusion I: Some plastic are polymers Conclusion II: No polymers are plastic
Oligomers react to form short chain polymers, then the short chained polymers react to form moderately long chain polymers. The number _________ can be predicted as a function of the extent of reaction.