What is the significance of the Constitution (Forty-second Amendment) Act, 1976?
The significance of the Constitution (Forty-second Amendment) Act, 1976 is that it made several key changes to the Indian constitution. Some of these changes include:

1. It added three new Fundamental Duties in the constitution, which are now part of Article 51A of the Constitution. These duties emphasize on respecting the constitution and the national flag, promoting harmony and the spirit of common brotherhood among all the people of India, and protecting and improving the natural environment.

2. It made several changes to the Preamble of the constitution, adding new words and phrases such as "socialism" and "secular", which emphasize the key principles on which the Indian state is founded.

3. It changed some of the rules related to the office of the President, making them more stringent and ensuring that the President cannot dissolve the Parliament at will.

4. It added new articles and amended existing ones in the constitution, further strengthening the power and authority of the central government while limiting the powers of state governments.