Hindi in Devanagari script was adopted as the official language of the Union by the Constituent Assembly on which date?
Hindi in Devanagari script was adopted as the official language of the Union by the Constituent Assembly on which date?
हिंदी को देवनागरी लिपि में संघ की राजभाषा के रूप में संविधान सभा ने किस तिथि को अपनाया था?