What is the curved surface of a liquid in a graduated cylinder called?

• A. Concave point
• B. Vertex
• C. Apex
• D. Meniscus

Answer: (D)

Verified step by step guidance

1. Understand that the question is asking for the name of the curved surface formed by a liquid inside a graduated cylinder.
2. Recall that when a liquid is placed in a container like a graduated cylinder, the surface of the liquid curves due to the interaction between the liquid molecules and the container walls.
3. Recognize that this curved surface can be either concave or convex depending on the liquid and container material, but the general term for this curved surface is the 'meniscus'.
4. Note that the other options such as 'Concave point', 'Vertex', and 'Apex' are terms used in geometry or other contexts, but not for the curved surface of a liquid.
5. Therefore, the correct term for the curved surface of a liquid in a graduated cylinder is the 'meniscus'.