$1 \, m^3 = \dots \dots$ litre

If the edge of a cube is $12 \, cm$,find its volume (in $cm^3$).

The length of a metal hollow cylinder is $70\, cm$. If the radius of the hollow inside it is $10\, cm$ and the metal thickness is $1\, cm$,find the difference between the areas of the outer and inner curved surfaces.

The radius of a cone is $5 \, cm$ and slant height is $9 \, cm$. The total surface area of the cone is $\ldots \ldots \ldots \, cm^2$.

The edge of a cube is $16\, cm$. Find the total surface area of the cube (in $cm^2$).

The diameter of a solid hemisphere is $42\, cm.$ Find the curved surface area of a hemisphere (in $cm^2$).