Well, most active and passive basses when you don't use EQ are very similar. After all, the front end of your head is basically an active preamp! An active bass merely moves part of that EQ circuit into the bass where it more convenient to adjust while you are playing.
In the Common Application, it says that the Personal Essay should be at least 250 words, and attached on a separate sheet (presumably, if you're submitting it online, you attach a one-page file).
Essay Content Is More Important Than the Number of Paragraphs. Ultimately, your essay will be evaluated on the information you present, not on the number of paragraphs in the essay. Early in your academic life, teachers and lecturers may give you both a structure for your essay and a guideline on how long each part of the essay should be.