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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

d)

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))

d)

7. find postfix and prefix of

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

8. Find out shortest path from A to B

A B C D E

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

d)

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}

14.select e_no from Employee where salary = salary

a) query invalid

b)

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

b)

c)

d)

16.B tree is different from other

a) has fixed index file size

b) is better for queries like < >=

c) searching will be easy

d)

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

{

char *t;

t=s1;

s1=s2;

s2=t;

}

void main()

{

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

func(s1,s2);

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