PERSISTENT PLACEMENT PAPER

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PERSISTENT PLACEMENT PAPER..

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Paper Pattern:
Two papers are there both of 1 hour
1.Objective
2.Programming ( in C ).

Objective Paper
Six Sections are there each section contains 5 Questions.
Paper is of GATE pattern.
1. Data Structure.
2. DBMS.
3. TOC.
4. OS.
5. General Section.
6. C programming.

DATA STRUCTURE

1. Question of Binary search tree to find
node when 43 will not be found Ans= Every data set was
having 43 as its last element.

2. To find complexity of Linked
list .Singly circular ordered list is there if m elements
are to be inserted what will be the complexity of time.
i. O(m*n).
ii. O(m*(m+n)).
iii. O((m+n)*log(m+n))

3. Adjacency matrix question to find
shortest path Ans=7.
A B C D E
A 0 m
B m 0 2 2 m
C 0 5
D 0 6
E 0
Where m=infinity, Find shortest path from B to E.

4. Forest & Tree question to find total
no of nodes
1 n-(p+2) ANS
2. n-p+2.
3. n-p. etc
same question is in Sahni I think go thru it.

5. Infix to Postfix expression Of A+B*
(C+D)/E+F {ANS=ABCD+*E/+F+ } question is not confirm but
pattern is of same type

DBMS

1. Query from Navathe Select fname,lname
from employee where eno in (select eno from works-on where
pno=(select * from project)); what is the output .

2. A query is given eg. Select name from
employee where salary=salary. They ask whether query runs
or not so just check it. Ans=Query Invalid

3. What is the main use of B & B+ trees in
database Ans= For queries

4. question on Left outer Join & Full
outer Join. For both Variables are given & in options
relationship is given to find whichever have greater tuples.

5. To save space which option is better .
Options are
i. Write all join operation than select than project.
ii. Write all join operation than project than select.
iii. Write all join operation in between select & project.

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OS

1. Using LRU how many page faults are
generated. 20 pages are there Ans=6 page fault

2. match the column
Options
i. semaphore i
ii. Monitor ii
iii. Deadlock iii
iv. Mutual Exclusion iv. Iv

3. One question on file locking. Scenario
is given
Ans 1. Provide indefinite locking

4. Prevent intermediate file Access. (Both
1 & 2)

5. If there are n processes & each process
waits p time in waiting state then CPU utilization is
(options are)
1. n(1-p)
2. (1-p to the power n) ANS (not sure)
3. 1-np.
4. n*p
5. A critical section is Ans = a set of instruction which
is shared by many process.

General

1. Probability to find digits which not
contain 7 between 100 to 999 Ans=18/25

2. Packet switching & Circuit Switching
some diff are there Ans= CS take more time to established
circuit.

3. A file have 3 bits for char such type
of question Ans= 27000 or 24000(Confused)

4. Hash table question Ans=2.
A hash table has size of 11 & data filled in its positions
like {3,5,7,9,6} how many comparison s have made if data is
not found in the list in worst case?.
Options= i. 2 ii. 6 iii. 11 iv. 1

5. From the set {a,b,c,d,e,f} find no. of
arrangements for 3 alphabets with no data repeated.
ANS=360. OR for 4 alpha ANS=720.

C Programming

1. Array pointer is pass

2. String Buffer Question

3. String Concatenate(Char *s1,Char *s2)
{
Char buf[1000];
Buf[0]=null;
Strcat(buf,s1);
Strcat(buf,s2);
Return buf;
}
i. should not return pointer to local variable.
ii. Nothing Wrong in this function.
iii. It don?t work if length exceeds 1000 char.
iv. Error in this code.

4. foo() call how many times Ans=5050.
For(i=1;i<=100;i++)
For (j=1;j<=100;j++)
Foo();

Programming Section ( mainly ask 2 programs.)

1. Occurrence of letters in String. Get
string from KB of any length & print letters coming maximum
time first than second largest?.. i.e in descending order.
Their requirement: They want that u make this program thru
linked list if u do that than it is well n good. Must
allocate memory dynamically. Use proper assumptions &
Comments everywhere this will add more advantage .use in
all programs.
Output look like if u enter string aababbbcba
b 5 times
a 4 times
c 1 times just like that
Hint: Make array of 256 chars. Now Scan the string pick
each char and according to it?s acsii value increment that
index value at last u have an array which have counter for
each alphabet. Sort this array & display.

2. Sparse Matrix Addition.
A structure of sparse matrix is given. You have to create a
function sparseadd to add 2 sparse matrices
Structure is some how like
Struct Sparsematrix
{
int row ;
int col ;
int val;
SparseMatrix *next;
}
You have to made function to add two sparse matrices.
Function signature like
SparseMatrix SparseAdd(SparseMatrix s1,SparseMatrix s2)

Interview Questions

1. Prepare DS,DBMS,OS,TOC thoroughly may
ask abt anyone everything .

2. Reversing a linked list.

3. How u make database for windows
directory structure or any OS.
Hint: using trees & field parent of which points to parent.

4. Make Program (Logic) to find word in
Dictionary.
Hint: using Hash Table.

5. Make logic of sorting which is not
given in books. Make ur own.

6. win NT architecture given in galwin
book in end.

7. File system FAT, NTFS etc.

8. Prepare your project & CV Thoroughly.

9. They ask to make a Joke.

10. Tcp/ip.

11. Whatever they presented in PPT watch it
carefully(Most Important)

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