Answer: (d) two diameters
Sol:
Two diameters cannot be parallel as they perpendicularly bisect each other.
Which of the following pairs of lines in a circle cannot be parallel?
(a) two chords (b) a chord and tangent (c) two tangents (d) two diameters
(a) two chords (b) a chord and tangent (c) two tangents (d) two diameters