Which city was founded by Krishna Deva Rai?

The answer is B, Nagalapura. Krishna Deva Rai founded this town near Tirupati in 1513 and named it after his mother, Nagaladevi. It was a planned township, and its founding is recorded as a specific act of a specific ruler, which is why it is the answer here.

• Warangal is wrong. It was the capital of the Kakatiyas, who ruled in the 12th to 14th centuries, long before the Vijayanagara empire.
• Udayagiri is wrong. The Udayagiri fort in Nellore district has an older history under other dynasties and was not founded by Krishna Deva Rai.
• Chandragiri is wrong. It became a Vijayanagara centre later, under the Aravidu dynasty, after Krishna Deva Rai's reign. It is known for its fort and palace, not for his foundation.

The core concept is the urban and religious policy of the Tuluva dynasty, the period of Vijayanagara's greatest territorial extent. For Mains GS-I, it links to medieval urbanism and the role of rulers in temple and town building, including his patronage at Tirupati.

Trap: candidates pick Warangal or Chandragiri because they are well-known medieval cities in the same region, and forget that a founding is a specific fact tied to the ruler's own record.