Question triggered on-off switch

A question triggered on-off switch uses the contraption segment of a shell, spring, and question block. Once the block is hit, a spring will come out of it and bonk into the shell. Then, the shell will hit the on-off switch and die because of the blue off block. Interestingly, this set-up without the blue off block is a fast on-off pulse. The diagram on the right shows the spring and blue block with tracks. These are, of course, not included in the actual contraption.