पंजाब के शुद्ध खेती वाले क्षेत्र का लगभग कितना प्रतिशत हिस्सा नहरों और नलकूपों जैसे सुनिश्चित सिंचाई स्रोतों द्वारा समर्थित है?

Who among the following founded the 'Forward Bloc'?

Which of the following statements regarding the Harappan Civilization is NOT correct?

Which ruler is generally credited with unifying much of Northern India under a single empire for the first time?