chemistry : class11 Convex Meniscus : Surface tension : States of Matter: Gases and Liquids MCQ Questions and Answers
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Convex Meniscus
MCQ questions and answers.
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MCQ Questions
1. Which liquid commonly forms a convex meniscus in a glass tube?
A.
Water
B.
Mercury
C.
Alcohol
D.
Kerosene
Correct Answer:
Mercury
Explanation:
Mercury forms a convex meniscus in glass because the cohesive forces between mercury particles are stronger than the adhesive forces between mercury and glass.
2. In a convex meniscus, the liquid surface is highest at the:
A.
Edges
B.
Center
C.
Bottom of the tube
D.
Outside of the tube
Correct Answer:
Center
Explanation:
A convex meniscus curves upward at the center and downward near the walls, so the center is the highest part of the surface.
3. A convex meniscus is formed when cohesive forces are:
A.
Weaker than adhesive forces
B.
Equal to adhesive forces
C.
Stronger than adhesive forces
D.
Absent between liquid molecules
Correct Answer:
Stronger than adhesive forces
Explanation:
When cohesion within the liquid is stronger than adhesion between the liquid and the container, the liquid surface becomes convex.
4. The angle of contact for a liquid forming a convex meniscus with glass is generally:
A.
Less than 90°
B.
Equal to 0°
C.
Equal to 90°
D.
Greater than 90°
Correct Answer:
Greater than 90°
Explanation:
A convex meniscus corresponds to a contact angle greater than 90°, indicating weak attraction between the liquid and the glass.
5. What is the shape of mercury's meniscus in a glass capillary tube?
A.
Concave
B.
Flat
C.
Convex
D.
Irregular
Correct Answer:
Convex
Explanation:
Mercury does not wet glass and forms a convex meniscus, with the center of the surface higher than its edges.
6. For a convex meniscus, the liquid level near the walls of the container is:
A.
Higher than at the center
B.
Lower than at the center
C.
Equal to the center in every case
D.
Unrelated to the center
Correct Answer:
Lower than at the center
Explanation:
The upward-curving surface of a convex meniscus places the liquid near the walls below the level at the center.
7. Which statement correctly describes a convex meniscus?
A.
It bulges upward at the center
B.
It dips downward at the center
C.
It is always perfectly flat
D.
It occurs only in gases
Correct Answer:
It bulges upward at the center
Explanation:
A convex meniscus has a curved surface that bulges upward in the middle and slopes downward toward the container walls.
8. Mercury forms a convex meniscus in glass mainly because mercury:
A.
Strongly wets the glass
B.
Has stronger adhesion to glass than cohesion
C.
Has stronger cohesion than adhesion to glass
D.
Has no surface tension
Correct Answer:
Has stronger cohesion than adhesion to glass
Explanation:
Strong mercury-mercury cohesion compared with mercury-glass adhesion causes mercury to pull away from the glass walls and form a convex meniscus.
9. A convex meniscus indicates that the liquid does not readily:
A.
Evaporate
B.
Wet the walls of the container
C.
Possess cohesive forces
D.
Remain in the container
Correct Answer:
Wet the walls of the container
Explanation:
A convex meniscus forms when adhesion to the container walls is weaker, so the liquid does not wet the walls effectively.
10. When mercury is placed in a narrow glass tube, the meniscus is observed as:
A.
Concave because adhesion dominates
B.
Convex because cohesion dominates
C.
Flat because surface tension is absent
D.
Concave because mercury wets glass
Correct Answer:
Convex because cohesion dominates
Explanation:
Mercury's cohesive forces are stronger than its adhesive forces with glass, producing a convex meniscus.
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