Textile Fibres (MCQ : MODULE 5 - Protein fibers )

Question 1: Alkali resistance is highest in case of

Cotton
Wool
Silk
Polyester

Question 2: Medulla is

associated with cotton
a cylindrical empty space in wool
nothing but air filled cells in wool fiber
a modified acrylic fiber

Question 3: Which of the following statements is not correct with respect to differences between silk and wool,

Silk is highly sensitive to alkali while wool is not
Silk is smooth while wool has scales on the surface
Silk is mostly composed of a few amino acids while wool has many more
Silk has higher crystallinity than wool

Question 4: The typical value of breaking elongation of wool under standard atmospheric condition is

5%
10%
25%
40%

Question 5: Density of wool in gm/cm³ is

1.52
1.31
1.39
1.10

Question 6: ……………..fibre contains 18 amino acids

nylon
wool
silk
mohair

Question 7: In which chemical wool dissolves?

dilute acidt
dilute alkali at boil
dilute alkali
concentrated HCl

Question 8: Degumming is carried out at what temperature?

50°C
boil
60°C
130°C

Question 9: What happens to wool in acid?

protonated
oxidized
hydrolysed
degraded

Question 10: What is the % of sericin in silk?

10
25
15
35

Question 11: __________process makes wool anti-felting

hydrogenation
chlorination
oxidation
reduction

 

 

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