Answer : 1. "एक संप्रभु, लोकतांत्रिक, गणराज्य"
Explanation :

The Preamble reveals the nature of Indian state: It declares India to be a Sovereign, Socialist, Secular, Democratic and Republican polity. Words Socialist, Secular, Integrity were added by 42nd amendment on the recommendation of Sardar swarn singh committee constituted by the late PM Indira Gandhi.