‘Nishaka’ in ancient India was known as

Gold ornament
Cows
Copper Coins
Silver Coins

The correct answer is (d). Nishaka was a type of silver coin used in ancient India. It was first introduced by the Kushan Empire in the 1st century CE. Nishakas were made of pure silver and were typically round in shape. They had a hole in the center so that they could be strung together. Nishakas were used as a form of currency and were also used as a symbol of wealth and status.

(a) Gold ornament is incorrect because nishka was a type of silver coin, not a gold ornament.
(b) Cows is incorrect because nishka was a type of coin, not a cow.
(c) Copper coins is incorrect because nishka was a type of silver coin, not a copper coin.