Question

multiple - choice question
what is true about solids?
they generally have a fixed mass and volume.
the mass stays the same and the volume changes.
the volume usually changes.
rewatch

Explanation:

Solids have definite shape and volume. Mass is the amount of matter in an object and for a given solid (unless matter is added or removed), mass is fixed. Volume of a solid (in normal conditions without change in temperature etc. that can cause expansion/contraction which is usually negligible for the basic property understanding here) is also fixed.

Answer:

They generally have a fixed mass and volume.