Growth in length is measured with the help of

A steel scale gives correct reading at 10^(@)C . If the length of a rod is measured with the help of that scale at 30^(@)C then the measured length will be

The alternating current can be measured with the help of

Alternating current can be measured with the help of

The rate of transpiration can be measured with the help of:

Growth in plant can be measured by

A plano convex lens of unknown material and unknown focal length is given. With the help of a spherometer we can measure the