The result (all quiz takings) are shown in the link on the syllabus page. Half the class got perfect scores!
I composed the quiz well in advance of preparing the lectures, and misjudged whether I would reach displays. So both the quiz and the assignment had one question each on displays, but both were look-it-up type of questions which I did not plan to cover explicitly in class anyway. Still, this was a teaching error on my part, for which I apologize The most difficult quiz question was the one on twisted nematic LCD displays, which I will explain Monday. But it is answered directly in Wikipedia, as 2/3's of you figured out.
For Question 1, it took a leap to see that, at a high level, the circuit is essentially checking if there are two or more 1's on the input, in which case it outputs 1. If there are zero or one 1's on the input, it outputs 0. This is sometimes called a majority circuit—it is checking if the majority of its inputs are 1.
The average grade in the class was B+.
Best of the Week honors to Marissa Cheng in collaboration with Valeria Vega! Here is Marissa's thorough submission. (Pardon the Word→HTML conversion artifacts.)
Finally, I updated the class Web page concerning the Registrar's S/U Grading deadline and a detailed Late-submission policy.