1. Which condition generally increases the rate of imbibition?
A.
Lower temperature
B.
Higher temperature
C.
Complete dryness
D.
Absence of an imbibant
Correct Answer:
Higher temperature
Explanation:
An increase in temperature generally increases the kinetic movement of water molecules and speeds up imbibition.
2. How does pressure usually affect imbibition?
A.
Increased pressure generally decreases imbibition
B.
Increased pressure always stops evaporation only
C.
Pressure has no effect on imbibition
D.
Increased pressure changes water into oil
Correct Answer:
Increased pressure generally decreases imbibition
Explanation:
External pressure opposes the entry and swelling of water in the imbibant, so imbibition generally decreases.
3. Which property of the imbibant is important in determining the amount of imbibition?
A.
Its colour
B.
Its nature and affinity for water
C.
Its sound
D.
Its electrical brightness
Correct Answer:
Its nature and affinity for water
Explanation:
Different substances have different affinities for water, so their ability to imbibe water varies.
4. A dry seed usually imbibes water more rapidly when it has:
A.
A larger exposed surface area
B.
A smaller exposed surface area
C.
No contact with water
D.
A completely waterproof surface
Correct Answer:
A larger exposed surface area
Explanation:
A larger surface area provides more contact between the seed and water, increasing the rate of imbibition.
5. Imbibition is generally greater when the difference in water potential between the imbibant and water is:
A.
Larger
B.
Zero in every case
C.
Unrelated to water movement
D.
Always negative only in the water
Correct Answer:
Larger
Explanation:
A larger water potential difference provides a greater driving force for water to enter the imbibant.
6. Which type of material generally shows strong imbibition because of its attraction for water?
A.
Hydrophilic material
B.
Oily material only
C.
Water-repellent plastic only
D.
A material with no surface
Correct Answer:
Hydrophilic material
Explanation:
Hydrophilic materials attract water and therefore commonly imbibe it more readily.
7. What happens to the rate of imbibition when the available surface area of an imbibant is increased?
A.
It usually increases
B.
It always becomes zero
C.
It changes into diffusion of gases
D.
It is completely prevented
Correct Answer:
It usually increases
Explanation:
Increasing the exposed surface area allows more water to come into contact with the imbibant at the same time.
8. Which factor can reduce the amount of water absorbed by an imbibant?
A.
High affinity of the imbibant for water
B.
Greater contact with water
C.
External pressure
D.
Suitable temperature
Correct Answer:
External pressure
Explanation:
External pressure opposes the swelling and entry of water, thereby reducing imbibition.
9. Why does increasing temperature usually increase imbibition?
A.
Water molecules move more actively
B.
The imbibant loses all its pores
C.
Water becomes a solid
D.
The surface area becomes zero
Correct Answer:
Water molecules move more actively
Explanation:
Higher temperature increases molecular movement, which generally helps water enter the imbibant more quickly.
10. Which combination is most likely to promote faster imbibition?
A.
Large surface area and high affinity for water
B.
Small surface area and strong external pressure
C.
No contact with water and low temperature
D.
Water-repellent material and increased pressure
Correct Answer:
Large surface area and high affinity for water
Explanation:
A large contact area and strong attraction for water both favour a faster rate of imbibition.
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