What is the definition of volume?

The volume of iron sphere and the volume of cylinder are numerically the same. Their radii are also the same. 

$\therefore$The height of cylinder$=$_____$\times \mathrm{radius}$

If radius of a sphere is rational, then which of the following is/are correct ?

$1.$Its surface area is rational.

$2.$ Its volume is rational.

Select the correct answer using the code given below :

The ratio of volume of a cube to that of a sphere which exactly fits inside the cube is

If the diameter of sphere is $12 cm$, then find the surface area and volume of the sphere.

The volume of sphere is $288\pi c{m}^3$. The radius of the sphere is 

By melting a solid cylinder of radius 3 cm and height 20 cm, five spherical balls each of same size are formed. Find the radius of each ball. 

(A) 2 cm

(B) 3 cm 

(C) 4 cm 

(D) 5 cm