Which of the following Acts had introduced communal electorate system in India.

Which part of the Indian constitution deals with Trade, Commerce and Inter Course within the territories of India?

The provisions in the Constitution of India like Constitutional Amendment can be done by 2/3rd majority in Parliament and election of the members of Rajya Sabha on the basis of proportional representation are incorporated form ?

In which case, Supreme Court held that Preamble is integral part of the constitution?

Arrange Himachal Pradesh, Manipur, Kerala, Maharastra in correct chronological order of creation?