Find the least count of the measuring cylinder used and the volume of the sphere in the set-up shown Fig.

Find the least count of the measuring cylinder used and the volume of the sphere in the set-up shown in fig.

The formula used to find the volume of a sphere

While measuring the diameter of a sphere using a vernier calipers the main scale reading was found to be p while the vernier coinciding division was q. If the least count of the instrument is r, then the radius of the sphere is given by the expression ________.

The least count of the voltmeter shown below is :

The radius and height of a cylinder are equal. If the radius of the sphere is equal to the height of the cylinder, then the ratio of the rates of increase of the volume of the sphere and the volume of the cylinder, is