On what date did the West Bengal Legislative Council (Abolition) Act, 1969 become effective?
The West Bengal Legislative Council (Abolition) Act, 1969 became effective on the first of August in 1969. This can be deduced from point 11 in the given context: "Subs. by the West Bengal Legislative Council (Abolition) Act, 1969 (20 of 1969), s. 4 for "Uttar Pradesh and West Bengal" (w.e.f. 1-8-1969)." Here, 'w.e.f.' stands for 'with effect from', indicating the effective date of the Act as August 1, 1969.