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PERSISTENT Placement Papers July 2012 by Persistent

Details of PERSISTENT Placement Papers July 2012 by Persistent conducted by Persistent for job interview.
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If there r n processes and each process waits p time in waiting state then cpu utilization is-:

a) n(1-p)

b) n*p

1. A string of pages were given and no of page faults have to be found in LRU algorithm

2. here is a file server which provides locking for mutual exclusion . if any procees locks the file

and abruptly terminated this will result in indefinitely locking .The solution they found is to

implement a timer for locking of file i.e. if time outs then server assumes that file is indefinitely

locked and terminate the process -

a) this solution is perfect for mutual exclausion

b) this will solve indefinite locking

c) this will result in interleaving of file between processes


3. A critical section is -

ans a set of instruction which is shared by many proceeses

4. There was a question on automata ans - the resultant string will have even no of c

5. CFG was given

S -> 1 S 1

S-> 0 S 0

S -> 1 1

S -> 0 0

Find out the string

6. One singly circular ordered list is there if M elements are ti be inserted what will be the

complexity of time

a) O(M*N)

b) O(M*(M+N))

c) O ((M+N) * log(M+N))


7. find postfix and prefix of

A + B * ( C + D ) / E + F

8. Find out shortest path from A to B


A 0 m

B m 0 2 2 m

C 0 5

D 0 6

E 0

9. From the following when 43 will not be found by binary search (a series was given with last

element 43 in each)

10. From 100 - 999 find the prob. Of getting 3 digit no with no 7 in any of its digit

a) 18/25

b) 10/25

c) 729/1000


11. from the set {a,b,c,d,e,f} find no of arrangements for 3 alphabet with no data repeated

12. To save space which option is better

a) write all join operation than select than project

b) ---------,,------------------than project----select

c) ----------,,-----------------in b/w select and project

Employee = { e_no , salary, fname, lname}

Works_On = {e_no, p_no, hrs}

Project = {p_no, p_name} e_no from Employee where salary = salary

a) query invalid


15.Select fname ,lname from Employee where e_no in (select e_no from works_on where p_no

=(select * from project))

a) name of Employee who works on all project




16.B tree is different from other

a) has fixed index file size

b) is better for queries like < >=

c) searching will be easy


17.func(char *s1,char * s2)


char *t;





void main()


char *s1="jack", *s2="jill";


printf("%s %s ",s1,s2);


OUTPUT jack jill

18.void main()


int a[5] ={1,2,3,4,5},i,j=2;

for (i =0;i