Which Constitutional Amendment act was passed during the Emergency of 1975 ?

42nd Constitutional Amendment Act

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

The Parliament also brought in many new changes to the Constitution. In the background of the ruling of the Allahabad High Court in the Indira Gandhi case, an amendment was made declaring that elections of Prime Minister, President and Vice-President could not be challenged in the Court. 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.