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Natural fibre products Quiz 30

Theme: Natural Fibre Products NFP Quiz 30 Natural fibre products Quiz 30

Natural fibre products Quiz 30

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Question 1 of 10

1. Question
1. What are the three main visual properties that define the optics of paper?
- A) Colour, whiteness, gloss
- B) Thickness, weight, smoothness
- C) Fibre length, density, porosity
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Question 2 of 10

2. Question
2. Why is opacity an important property in paper products, especially for printed materials?
- A) It prevents ink from drying
- B) It increases the gloss of the paper
- C) It prevents disturbances from back-side printing
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Question 3 of 10

3. Question
3. Which theory is commonly used to determine the basic optical properties of paper surfaces, such as light scattering and absorption?
- A) Maxwell’s Theory
- B) Fourier Analysis
- C) Kubelka-Munk Theory
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Question 4 of 10

4. Question
4. True or False: The elastic modulus of paper is always the same in tension and compression.
- A) True
- B) Only for machine-made paper
- C) False
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Question 5 of 10

5. Question
5. What is the typical range of elastic modulus values for paper, in GPa?
- A) 0.1–1
- B) 2–20
- C) 50–100
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Question 6 of 10

6. Question
6. What is the significance of the Poisson ratio in paper mechanics?
- A) It measures the colour of paper
- B) It gives the lateral strain for a given longitudinal strain
- C) It determines the gloss of the paper
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Question 7 of 10

7. Question
7. Which direction in machine-made paper typically shows a higher elastic modulus?
- A) Machine direction (MD)
- B) Cross-machine direction (CD)
- C) Thickness direction (ZD)
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Question 8 of 10

8. Question
8. What effect does drying shrinkage have on the elastic modulus of paper?
- A) It increases the elastic modulus
- B) It decreases the elastic modulus
- C) It has no effect
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Question 9 of 10

9. Question
9. True or False: The load-elongation curve of paper is always linear up to the point of failure.
- A) True
- B) False
- C) Only for chemical pulps
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Question 10 of 10

10. Question
10. Which two factors influence the shape of the load-elongation curve in paper?
- A) Drying shrinkage and wood species
- B) Colour and gloss
- C) Opacity and thickness
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This page has been updated 07.01.2026

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