अलाउद्दीन खिलजी के शासनकाल के दौरान किस प्रमुख विदेशी शक्ति ने पंजाब पर बार-बार आक्रमण किया था?

Who built the Shahi (Royal) road during his rule, which was later renovated and renamed the Grand Trunk Road by the British?

In which year was the Bahmani Sultanate established?

The 'Alai Darwaza', the entrance gate of Qutub Minar, was constructed during whose reign?