Paper 5

Paper Pattern:

Two papers are there both of 1 hour

1.Objective
2.Programming ( in C ).

I am submitting few Questions which I remember. For obj test go thru Book Handa for GATE

preparation.

They were more concentrating on programming section so be prepare.

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
Can’t remember question but options are such that

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.
I think answer is iii.
Prepare normalization & SQL part for interview.
OS
1. Using LRU how many page faults are generated. 20 pages are there Ans=6 page fault
2. 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
2. Prevent intermediate file Access. (Both 1 & 2)
4. 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 (objective)
Three questions on pointers just go thru Test ur C skills
1. Question on jack & jill given in the book they ask whether swap or not Ans=No
2. Array pointer is pass (It is easy) Ans=Error
3. String Buffer Question
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();
TOC
1. Grammar satisfaction {0,1}.Ans= option a .
2. Ques on DFA & NDFA Ans= contain even no of c
3. Ans=0*1*.
Programming section
They 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
nt 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)
3. A man uses 1 or 2 steps of upstairs .If there are n upstairs how many possible
combinations are there. Write a program to calculate the logic.
Eg:- If there are 4 upstairs then 5 possible combinations are there
1 1 1 1
2 2
1 1 2
1 2 1
2 1 1

Use the concept of Fibonacci series & u crack it easily.
Please pay proper attention on COMMENTS & ASSUMPTIONS. Use these as
much as possible. Give proper OUTPUT of your program & also explain how your
logic works.
Once again they More concentrate on PROGRAMMING SECTION.
In INTERVIEW they definitely ask that how you solve these questions, What logic you use. So be
prepare for all these.
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.
4. Make logic of sorting which is not given in books. Make ur own.
5. win NT architecture given in galwin book in end.
6. File system FAT, NTFS etc.
7. Prepare your project & CV Thoroughly.
8. They ask to make a Joke.
9. Tcp/ip.
10. Whatever they presented in PPT watch it carefully(Most Important)
Some Other Questions which I got from my Friends
1. 10,000 nodes ANS=25
2. Hit Ratio Question Ans=98%
3. Frequency Question Ans=35000 or 32000
4. DBMS Transaction Question ANS=Normalised other option have ACID sothis