Which of the following is NOT a principal centre of the Revolt of 1857?
1. Ambala
2. Gwalior
3. Jabalpur
4. Kochi

4

Kochi is NOT a principal centre of the Revolt of 1857. The impact of Revolt of 1857 was felt most strongly in Northern India. Ambala, Gwalior, and Jabalpur were indeed important centres during the Indian Rebellion of 1857. Kochi, located in the southern part of India, was not a significant center of the revolt.