Which Constitutional Amendment Act inserted the word 'Socialist' and 'Secular' in the Preamble of the Constitution of India?

42nd Constitutional Amendment Act

The correct answer is option (1) - 42nd Constitutional Amendment Act

The word 'Socialist' and 'Secular' were inserted in the Preamble of the Constitution of India by the 42nd Amendment Act of 1976.

The forty-second amendment was also passed during the Emergency. This amendment consisted of a series of changes in many parts of the Constitution. Among the various changes made by this amendment, one was that the duration of the legislatures in the country was extended from five to six years. This change was not only for the Emergency period, but was intended to be of a permanent nature. Besides this, during an Emergency, elections can be postponed by one year. Thus, effectively, after 1971, elections needed to be held only in 1978; instead of 1976.