When water is available at a higher level and it is supplied to lower level by the mere action of gravity, the type of Surface irrigation is called

Which among the following is the mostly used flow irrigation method in India?

The size of field book is generally

Average length of step of a normal man is taken as

The instrument attached to the wheel of a cycle or other vehicle to record number of revolutions made by the wheel

Kerala ranks________ among Indian States based on population

First fully literate township in Kerala