(d) King
In the sangam age, the kingship was hereditary. The king was called Ko. It is the shortened form of Kon. Vendan, Kon, Mannan, Kotravan and Iraivan were the other titles by which the king was addressed. The eldest son of the reigning king generally succeeded to the throne.

(d) Kural
Tirukkural also called Kural, is a classic Tamil text written by Thiruvalluvar, believed to have lived sometime between the 2nd century BCE and the 5th century CE.
It has had an immense influence on Tamil culture and life. It is a collection of 1,330 couplets (kurals) that offer timeless wisdom on various aspects of life, including ethics, governance, love, and spirituality.
Thirukkural is divided into three main sections or books: Aram (Virtue), Porul (Wealth), and Inbam (Love).
The Nalayira Divyaprabandham is another Tamil text that is considered as important as the Four Sanskrit Vedas.

(a) Herodotus
Herodotus is popularly known for having written the book “The Histories” which is a detailed record of his “inquiry” over the origins of the Greco-Persian Wars. He is widely regarded to have been the very first writer to have treated and viewed historical subjects with a method of systematic investigation—specifically, by the means of collecting his materials and then carefully arranging them into a historiographic narrative. On account of this, he is often referred to as “The Father of History,” a title that was first conferred on him by the first-century BC Romanorator Cicero.
He was known as the father of history as he was the first historian known who had collected all the sources as well as materials in a systematic order. Plus he also tested their accuracy to give a proper explanation.

(d) Sarnath
Kumardevi, the queen of Govindachandra Gahadavala, constructed Dharmachakrajinavihar at Sarnath. Kumaradevi, the Buddhist queen of the great Gahadavala king Govindrachandra of Kashi (CE 1114-1154). All the halls and apartments of the monks have disappeared. This monastery had two gateways towards the east, there being a distance of 88.45 m between the two. At the western most edge of the site, a distinct covered passage leads to a small medieval shrine.

(b) Electric current
Strength of current ia measured in Amperes.
Electric current: The flow of electric charges through a conductor constitutes an electric current. Quantitatively, electric current in a conductor across an area held perpendicular to the direction of flow of charge is defined as the amount of charge flowing across that area per unit time.