Correct Answer:- Option-A
Question48:-Analysis of fiber structure by means of diffraction of electromagnetic waves is more compatible with x-rays
than with ordinary visible light because
A:-X-rays has higher energy than ordinary light
B:-X-rays has wave lengths smaller than ordinary light
C:-It is easy to get picture or photographs with x-rays
D:-Wave lengths are comparable with crystallite sizes of fibre
Correct Answer:- Option-D
Question49:-Electromagnetic waves used in NMR spectroscopy is
A:-Ultra-violet rays
B:-Radio waves
C:-Gamma rays
D:-Infra-red rays
Correct Answer:- Option-B
Question50:-The helix reversal is found in
2:46
B:-Wool
C:-Silk
D:-Cotton
Correct Answer:- Option-D
Question51:-If | modulus and moment of inertia of a fibre are denoted by E and |, respectively, the bending rigidity of
the fibre is expressed as
கபா
8:
C:-EP
D:-El
Correct Answer:- Option-D
Question52:-Which one of the following statements is wrong?
A:-The density is same for both cotton and viscose
B:-The degree of polymerization is same for both cotton and viscose
C:-Both cotton and viscose are hydrophilic fibres
D:-Both cotton and viscose are the cellulosic fibres
Correct Answer:- Option-B
Question53:-Which one of the following statements is correct with respect to a textile fibre?
A:-lt is transversely isotropic
B:-The primary bond strength is weaker than secondary bond.
C:-Essentially it is made of short chain molecules.
D:-It 15 having very high density.
Correct Answer:- Option-A
Question54:-Which one of the following statements is true?
A:-Glass is 100% crystalline fibre.
B:-Polypropylene is 100% amorphous fibre.
C:-Cotton is 50% crystalline fibre.
D:-Wool is 30% crystalline fibre.
Correct Answer:- Option-D
Question55:-Water acts as catalyst for the production of
A:-Nylon 6
B:-Acrylic
C:-Viscose
D:-Polyester
Correct Answer:- Option-A
Question56:-Which of the following fibre properties is not governed by its amorphous content?
A:-Dye uptake
B:-Moisture content
C:-Extel lity
D:-Friction
Correct Answer:- Option-D
Question57:-Which one of the following is the comrect order in a DSC heating plot with increasing temperature?
A:-Glass transition, crystallization, melting