Regarding the diagnostic theories for the decline of the Harappan Civilization, which historian/scholar proposed the theory that the "drying up of the Ghaggar-Hakra river" was the primary cause?

Emperor Harshavardhana was widely recognized not only as a conqueror but also as a 'Scholar King' and a literary monarch. Which of the following is NOT one of the three famous Sanskrit plays authored by him?

Which dynasty is credited with building India's first sub-continental empire, possessing an army so massive that it deterred Alexander the Great's soldiers from crossing the Beas river?

In the history of the deep south, which Chera king is renowned for his Himalayan expedition and for founding the 'Pattini' cult (worship of Kannagi as the ideal wife)?

As a long-term linguistic impact of the Achaemenid (Persian) invasions on Northwest India, which script was introduced that significantly influenced later Ashokan rock edicts in that region?

4.Which of the following is/are the unitary feature(s) of the Indian Constitution?
1.All-India Services
2.Written Constitution 3.Integrated Judiciary Select the correct answer using the code given below:

Which of the following provision(s) of the Constitution of India was/were given immediate effect from November 26 1949, before the whole Constitution came into force?
1.Citizenship
2.Emergency provisions 3.Elections 4.Fundamental rights

Which one of the following best distinguishes a parliamentary system from a presidential system?