1. What happens when a dry piece of paper is placed in water?
A.
It absorbs water and becomes wet
B.
It produces water
C.
It changes into oil
D.
It becomes completely waterproof
Correct Answer:
It absorbs water and becomes wet
Explanation:
Dry paper absorbs water because its cellulose fibers have an attraction for water. This absorption is an example of imbibition.
2. Which substance in paper mainly helps it absorb water?
A.
Cellulose fibers
B.
Plastic coating
C.
Metal particles
D.
Oil droplets
Correct Answer:
Cellulose fibers
Explanation:
Paper contains cellulose fibers, which are hydrophilic and attract water. Water enters the spaces between these fibers during absorption.
3. Paper absorbs water mainly because its cellulose fibers are:
A.
Hydrophilic
B.
Metallic
C.
Water-repellent
D.
Gas-filled
Correct Answer:
Hydrophilic
Explanation:
Hydrophilic cellulose fibers have an attraction for water, allowing paper to absorb water through imbibition.
4. The upward movement of water through a strip of paper is mainly due to:
A.
Small spaces between paper fibers
B.
The production of water by paper
C.
The melting of cellulose
D.
The action of sunlight alone
Correct Answer:
Small spaces between paper fibers
Explanation:
Water moves through the tiny spaces between paper fibers. These narrow spaces help paper absorb and draw water upward.
5. Which observation shows that paper can absorb water?
A.
A dry paper strip becomes wet after touching water
B.
A dry paper strip produces salt
C.
A dry paper strip becomes a metal sheet
D.
A dry paper strip repels all water
Correct Answer:
A dry paper strip becomes wet after touching water
Explanation:
The paper becoming wet shows that water has entered its cellulose fibers and spaces, demonstrating paper absorption.
6. Why does a paper towel absorb spilled water?
A.
Its cellulose fibers attract and hold water
B.
It converts water into air
C.
It contains no spaces between fibers
D.
It pushes water away from its surface
Correct Answer:
Its cellulose fibers attract and hold water
Explanation:
Paper towels contain cellulose fibers with many small spaces. These fibers attract and retain water during absorption.
7. What is the role of tiny spaces in paper during water absorption?
A.
They provide passages for water movement
B.
They prevent water from entering
C.
They produce cellulose
D.
They change water into vapor immediately
Correct Answer:
They provide passages for water movement
Explanation:
The tiny spaces between paper fibers allow water to move through the paper, helping the paper absorb water.
8. Which type of paper generally absorbs water more easily?
A.
Uncoated paper
B.
Wax-coated paper
C.
Plastic-coated paper
D.
Polythene sheet
Correct Answer:
Uncoated paper
Explanation:
Uncoated paper exposes its hydrophilic cellulose fibers, allowing water to enter more easily than in coated materials.
9. When water rises through a narrow strip of paper, the paper is demonstrating:
A.
Absorption through its fibers
B.
Water formation by photosynthesis
C.
Destruction of cellulose
D.
Complete rejection of water
Correct Answer:
Absorption through its fibers
Explanation:
Water rising through paper occurs because the cellulose fibers and their narrow spaces attract and draw in water.
10. Which everyday object demonstrates water absorption by paper?
A.
A paper towel wiping a wet surface
B.
A glass marble in water
C.
A metal spoon in a cup
D.
A plastic ruler on a desk
Correct Answer:
A paper towel wiping a wet surface
Explanation:
A paper towel absorbs water from a surface through its hydrophilic cellulose fibers and the spaces between them.
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