The essential content(s) in each entry of a page table is / are:

A multilevel page table is preferred in comparison to a single level page table for translating virtual address to physical address because.

How many $$32K\,\, \times \,\,1RAM$$ chips are needed to provide a memory capacity of $$256$$ $$K$$-bytes?

Consider a disk system with $$100$$ cylinders. The requests to access the cylinders occur in following sequence:
$$4, 34, 10, 7, 19, 73, 2, 15, 6, 20$$
Assuming that the head is currently at cylinder $$50,$$ what is the time taken to satisfy all requests if it takes $$1$$ $$ms$$ to move from one cylinder to adjacent one and shortest seek time first policy is used?