The Arabs invaded Sind under The leadership of ________.
After the death of Muhammad, his successors came to be known as ________.
The principal city of Omayyad dynasty was ________.
The early capital of Khalifas was _________.
The contagious nature of tuberculosis was discovered by _________.
Mohammad Ghauri occupied Delhi after defeating Prithviraj Chauhan towards the end of the _______ century.
