# Questions by thehobo03

1 vote
1
Consider a magnetic disk containing 400 sectors per track. An application needs to read 100 randomly scattered sectors for loading the libraries at start up. Reading each sector requires exactly one disk access. The average seek time of the disk to a random location is given ... Rotational speed of the disk is 6000 rpm. How long does it take to load libraries at start up to run the application?
2
Ms. Jones has 10 books that she is going to put on her bookshelf. Of these, 4 are mathematics books, 3 are chemistry books, 2 are history books, and 1 is a language book. Ms. Jones wants to arrange her books so that all the books dealing ... the same subject are together on the shelf. How many different arrangements are possible? Please provide a different explanation rather than the textbook one.
1 vote
3
The solution of an = 2an-1 + 1 where a0 = 1 is ? Please use the substitution method because I seem to have problem understanding it.
4
How many ways we can put 5 letters L1, L2, L3, L4, L5 in 5 envelopes e1, e2, e3, e4 and e5 (at 1 letter per envelope) so that i. no letter is correctly placed? ii. at least 1 letter is correctly placed? iii. exactly 2 letters are correctly placed? iv. at most 1 letter is correctly placed? v. at least 1 letter is wrongly placed? vi. exactly 1 letter is wrongly placed?
5
Show that the following statement is a tautology using Truth Table ( p ^ q) --> p I have some minor doubts in this seemingly simple question. First a tautology is a statement which is always True, but while solving the question we get 1 False value, so how is still called a tautology?
6
How long does it take to load a 64Kbytes Program from a disk whose Average Seek time is 30 ms Rotation time is 20 ms, Track Size is 32 Kbytes, Page Size is 4 Kbytes . Assume that Pages of the program are distributed randomly around the disk. What will be the % saving in time if 50% of the Pages of the program are Contiguous?