The arrival of Vasco da Gama at Calicut  was a landmark event in the annals of history. In which year did he arrive in Kerala?

The first newspaper published in India was `Bangal Gazette'. When did it start its publication?

The year in which the Decimal System of coinage was introduced in India. 

President Fakhruddin Ali Ahmed, upon advice by Prime Minister Indira Gandhi Gandhi declared a state of emergency in India which lasted for 18 months. It was declared in the year:

The constitution of India formerly included the 'right to property' under the Articles 19 and 31, in the list of fundamental rights. This was later removed from the list. In which year was this change brought into effect? 

The Indian Constitution came into force on: