Answer-
When the height is doubled, the volume of the cone also gets doubled.
Solution-
Volume of a cone is given by,

Where,
V = Volume,
r = radius of the base,
h = height of the cone.
Let, height at first be x, then volume would be,

As the height is doubled, so height = 2x, then volume would be,

Therefore, when the height is doubled, the volume of the cone also gets doubled.