Problem: Does "Thus the overall efficiency of electric traction as compared to diesel more than doubled between 1950 and the mid-1970s in the Soviet Union." answer the question "Was there an energy efficiency improvement in the period 1974 through 1980?"

A: no

Problem: Does "The forms of practical capacitors vary widely, but all contain at least two electrical conductors (plates) separated by a dielectric (i.e. an insulator that can store energy by becoming polarized)." answer the question "How many electrical conductors, or plates, do all capacitors contain at a minimum?"

A: yes

Problem: Does "John had five legitimate children, all by Isabella." answer the question "How many legitimate children did John have?"

A:
yes