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Natural fibre products Quiz 27

Theme: Natural Fibre Products NFP Quiz 27 Natural fibre products Quiz 27

Natural fibre products Quiz 27

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Question 1 of 10

1. Question
1. What does rheology as a science cover?
- A) Processes where the macroscopic mechanical response couples with the flow of the material
- B) The study of paper's color changes
- C) The chemical composition of paper
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Question 2 of 10

2. Question
2. What happens to the mechanical properties of paper when the rate of loading changes?
- A) They remain constant
- B) They become unpredictable
- C) They depend on the rate of loading due to microscopic or molecular rearrangements
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Question 3 of 10

3. Question
3. What is the primary cause of the viscoelastic properties of paper?
- A) The softening of the amorphous components of the fibre wall, hemicelluloses, and lignin
- B) The crystalline structure of cellulose
- C) The presence of water
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Question 4 of 10

4. Question
4. What is the effect of moisture on the viscoelastic properties of paper?
- A) Moisture has no effect
- B) Moisture makes paper more brittle
- C) Moisture strongly influences the softening of the amorphous components
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Question 5 of 10

5. Question
5. What is the dynamic elastic modulus in the context of paper rheology?
- A) The ratio of stress to strain in a dynamic mechanical test, consisting of storage modulus and loss modulus
- B) The ratio of stress to strain in a static test
- C) The measure of paper's thickness
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Question 6 of 10

6. Question
6. What is the primary difference in the behavior of paper at high and low moisture contents?
- A) At high moisture contents, paper behaves as a linearly elastic body
- B) There is no difference
- C) At low moisture contents, paper behaves as a linearly elastic body
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Question 7 of 10

7. Question
7. What is the significance of the glass transition temperature (Tg) in the context of paper rheology?
- A) It indicates when paper becomes waterproof
- B) It marks the temperature below which amorphous materials are glass-like and above which they become fluid-like
- C) It is irrelevant to paper properties
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Question 8 of 10

8. Question
8. What happens to the elastic modulus of paper as moisture content increases?
- A) It increases exponentially
- B) It decreases approximately exponentially
- C) It remains unchanged
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Question 9 of 10

9. Question
9. What is the primary cause of creep in paper?
- A) The crystalline structure of cellulose
- B) The elongation of bonded fibre segments and the opening of inter-fibre bonds
- C) The presence of fillers
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Question 10 of 10

10. Question
10. What is the effect of drying stress on the internal stress of paper?
- A) Drying stress has no effect on internal stress
- B) The internal stress is equal to the final drying stress level in restrained drying
- C) Drying stress reduces internal stress to zero
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This page has been updated 07.01.2026

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