https://biharboardbooks.com/class-10-social-science-objective-questions-history-chapter-8-%e0%a4%aa%e0%a5%8d%e0%a4%b0%e0%a5%87%e0%a4%b8-%e0%a4%8f%e0%a4%b5%e0%a4%82-%e0%a4%b8%e0%a4%82%e0%a4%b8%e0%a5%8d%e0%a4%95%e0%a5%83/