With regard to the Constitution of India, which of the following statements is not correct?

Statement 3 is incorrect because the Preamble of the Indian Constitution is non-justiciable, meaning its provisions are not enforceable in a court of law. While the Supreme Court in the Kesavananda Bharati case (1973) held that the Preamble is a part of the Constitution and contains its basic structure [2], it remains non-enforceable. Statement 1 is correct as the words 'Socialist' and 'Secular' were added later by the 42nd Constitutional Amendment Act of 1976 [2]. Statement 2 is correct because the Preamble specifies the objectives of the Constitution, such as justice, liberty, equality, and fraternity [3]. Statement 4 is correct as the Preamble explicitly states that the Constitution derives its authority from 'We, the People of India,' establishing the people as the ultimate source of authority [2].

Sources

1. [2] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 5: Preamble of the Constitution > 1 AMENDABILITY OF l THE PREAMBLE > p. 48
2. [1] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 5: Preamble of the Constitution > II Secular > p. 43
3. [3] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 5: Preamble of the Constitution > INGREDIENTS OF THE PREAMBLE > p. 42