Mercury in a test tube forms ______ meniscus

concave

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convex

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cant say

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Solution

The correct option is B convex
Answer: $c o n v e x$
Mercury in a test tube forms $c o n v e x$ meniscus.
The $c o h e s i v e f o r c e$ between the molecules of the material i.e $m e r c u r y$ is higher than the $a d h e s i v e f o r c e .$
The molecules tend to bind each other tightly hence the force in the test tube is inwards due to the surface tension.

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