Answer from cs61c-ee (Michael Shen 15963205) for Question 2
The advantage of fix-sized blocks is that it eliminates the need to find a contiguous block of memory to allocate to a program.  The operating system just needs to find enough pages in main memory.
  Bigger chunks will reduce the rate of misses.  Smaller chunks reduce the miss penalty but not enough to compensate for the latency time for disk access.  Smaller chunks allow virtual addresses to map to more locations in main memory.