What is the diameter of the optical fibres used to carry voice, video and data signals in telecommunication networks

The book which speaks about 'ancient musical instrument' is

Which Sri Lankan poet is named in Sangam Literature

According to the 2009 Tamil Nadu Marriage Act, the marriages in Tamil Nadu should be registered within

Who among the following was an independent member who formed the ministry in Madras Presidency during 4th December, 1926

When was the first Communal G.O. Issued