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Yes, if two lines are parallel they will nver come togather or cross.
Eleven is the simplest one that I can come up with.
No, pyramids of any kind will never have any parallel faces. This is because all of the faces, excluding the base, must meet at a single point.
The ray comes out parallel to the incident ray because the ray has the opposite refraction as when it entered the block.
If the tracks are not parallel, the wheels will not stay on the tracks; train wheels are spaced at a fixed width, or gauge, and that width cannot expand or contract to accommodate non-parallel tracks. Thus, if the tracks were non-parallel, the wheel would come off the track and cause a derailment.