21. In which year did Dasarath Dev first become the Chief Minister of Tripura

(A)  1986
(B)  1990
(C)  1993
(D)  1995

22. Kok Borok Language Day is observed in Tripura on

(A)  15th January
(B)  19th January
(C)  31st January
(D)  10th February

23. When was the Tribal Research Institute established in Tripura

(A)  1970
(B)  1973
(C)  1980
(D)  1982

24. In which year was the concept of “Tribal Sub-Plan” adopted in Tripura

(A)  1968
(B)  1972
(C)  1974
(D)  1978

25. “Tripura Sixth Schedule Bill” was passed by the Loksabha in the year

(A)  1970
(B)  1973
(C)  1979
(D)  1984