Who was appointed as the Qazi (Judge) of Delhi by Sultan Muhammad bin Tughlaq?

Ibn Batuta went to China as the envoy of which one of the following Delhi Sultans?

Which of the following dynasties was designated as 'Balhar' by the Arab travellers?

In 1017 CE, the scholar Al-Biruni was brought to Ghazni by Sultan Mahmud following his military conquest of which region?

The earliest reference of the use of magnetic compass in the Indian seas was by –

The earliest reference of the use of magnetic compass in the Indian seas was by