In a political career spanning five decades, Kar was a senior leader of the Communist Party of India (Marxist) and occupied several portfolios in the Government of Tripura.

[3][4] Prior to his election as Deputy Speaker, Kar was Industry Minister of Tripura from 1998 to 2004.

He attended the MBB College in Agartala, then affiliated to University of Calcutta and earned a BSc in Pure Science with distinction in the year 1971.

As of 2019[update] the current deputy is Shri Biswa Bandhu Sen, since 21 June 2018.

[6][7][8] In 2018 Tripura Legislative Assembly election he was defeated by Bharatiya Janata Party candidate Ratan Chakrabarty.