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Natural fibre products Quiz 25

Theme: Natural Fibre Products NFP Quiz 25 Natural fibre products Quiz 25

Natural fibre products Quiz 25

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Question 1 of 10

1. Question
1. What is bending stiffness in the context of paper and board?
- A) The ability of a structure to absorb moisture.
- B) The ability of a structure to resist the effect of forces that are out of its axial or planar direction.
- C) The ability of a structure to resist tearing.
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Question 2 of 10

2. Question
2. Which property affects bending stiffness the most?
- A) Tensile strength.
- B) Moisture content.
- C) Thickness.
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Question 3 of 10

3. Question
3. What happens when the bending stiffness of printed paper is too low?
- A) It increases the tensile strength.
- B) It can make thumbing of printed matter difficult.
- C) It improves the print quality.
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Question 4 of 10

4. Question
4. What is the primary factor that determines the bending stiffness of paper and board?
- A) Moisture content.
- B) Color.
- C) Grammage.
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Question 5 of 10

5. Question
5. What is the effect of high bending stiffness in folding boxboard?
- A) Reduces the print quality.
- B) Ensures good performance of the creases.
- C) Increases the moisture absorption.
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Question 6 of 10

6. Question
6. What is the relationship between bending stiffness and grammage?
- A) There is no relationship between bending stiffness and grammage.
- B) High grammage gives low bending stiffness.
- C) High grammage gives high bending stiffness.
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Question 7 of 10

7. Question
7. What is the effect of calendering on bending stiffness?
- A) Decreases bending stiffness through thickness and increases it through elastic modulus.
- B) Increases bending stiffness through thickness and decreases it through elastic modulus.
- C) Has no effect on bending stiffness.
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Question 8 of 10

8. Question
8. What is the bending stiffness index used for?
- A) To compare papers or boards of different grammage.
- B) To measure the moisture content.
- C) To determine the color quality.
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Question 9 of 10

9. Question
9. What is the significance of the neutral plane in bending stiffness?
- A) It is the plane where there is no strain.
- B) It is the plane where maximum strain occurs.
- C) It is the plane where moisture is absorbed.
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Question 10 of 10

10. Question
10. What is the effect of surface sizing on bending stiffness?
- A) Increases bending stiffness because the size increases the elastic modulus of the fibre network.
- B) Decreases bending stiffness because the size decreases the elastic modulus of the fibre network.
- C) Has no effect on bending stiffness.
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This page has been updated 07.01.2026

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