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# Placement Papers - Hughes

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Hughes Placement Paper (Technical- DS, CO, OS)
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Paper: Hughes Placement Paper (Technical- DS, CO, OS)

1- What is max. no. of hops in hypercube n/w with n (=2 ^ p) to go from one node to another ?
a. p
b. log p
c. n ^ 2

2- What is Kerberos ?
ans. Authentication Protocol.

3-In completely connected multiprocessor system with n processors , links will be of the order of
a. O(n ^ 2)
b. O(2 ^ n)
c. O(n/2)

4-When quick sort gives worst performance ?
ans. When elements are in order.

5- o/p of each sorting step of 8 elements was given and had to recognise which sorting algo.?
Ans. Bubble sort (Not Sure , Check it out )

6-In worst case ,which sort is best out of following sorts?
a.heap
b.selection
c.quick (ans.)
d. insertion

7-Three very simple gate circuits each having inputs A,B,C,D were given and had to tell ,which two give same result ? (DeMorgan's Law was used in solving )
Ans. was (a) &(c) (o/p of a & c was coming to be AB +CD)

8- K-map given,had to tell simplified function

K-Map was
CD`

AB 0 0 0 0

0 0 1 0

1 1 1 1

0 1 1 1

9-What is Function Point ?
Ans. S/W estimation technique

10-p points to an integer. We don't want p to change value. In C, what declarations will we use?
A const int *p
b.int *p
c.int const *p
e. int* const p (perhaps ans.)

11-Diff between 2NF &3NF ?
Ans. D (last option)

12.Which does not use client server model ?
a. Email
b. Web access
c. C. Telephone call
d. N/w file system

13-In a pipeline having 3 stages, each having reliability of 0.9 ,what is overall reliability of pipeline?
a. 0.9
b. 0.729
c. 0.81

14-2level cacheis there first level cache's access time is 100ns,second level cache's access time is 33ns & memory access time is 1000 ns What is total memory access time ?
ans. 140 ns

15-In public key cryptography,Awillsend message to B

ans. Using B's public key

16-What does projection of a relation give?
Ans .gives vertical partition of relation corresponding to specified columns.

17-For disk or direct access storage, which is best ?
a. AVL
b. B-tree
c. Red tape ...

18-There is a tree with inorder threading Node B is inserted as left child of node A. Node A already has right child . Where will the null ptr of B point ?
ans. Parent of A (perhaps)

19-There is a diskless workstation. Which will be the first protocol it will use ?
a FTP
b. ARP
c. HTTP
d. RARP

20-Compiler keeps which of following ?
ans. Symbol table

21- 'ping' command uses which protocol ?
ans. ICMP

22-Merge sort uses which technique?
Ans. Divide and Conquer

23-Program counter is incremented in
a. fetch (ans)
b. decode
c. execute

24-what does the following program do ?
f(int n)
{
int c;
while(n)
{
n&=n-1;
c++;
}
print c;
}
ans. Program prints the no. of set bits in no.

25-What is this called (char *) (*(*(*A[X]) ( ) )) ( )
ans. Array of X pointers to a function returning pointer to functions that are returning pointer to
char (not sure )

26- For synchronization in distributed computing, what should not be there ?
a. all machines are synchronized by a global clock

b. all systems should have their own clock (perhaps ans)

27-Java applet of a moving /waving file is running on one machine then it means
b.A virtual X server is running on that m/c while the actual program is running on the web server.

28-What is in RSA algo. ?
a. First the session key is encrypted & then whole message is encrypted using RSA Algo.
b. Message is encrypted using RsA algo.
c. First Rsa algo is used &then encrypted with the session key.

a. Transaction reexecutes and gives diff. Results from the original execution
b. Read is done when the transaction is not yet committed

30-What is coupling ?
a. It tells the strength of interconnection between two program units.
b. It tells the strength of interconnection between strength of interconnection between two program units.
c. It tells the strength of interconnection between strength  of interconnection between two program units.
d. It tells the strength of interconnection between two program units and one program unit

31-Any n/w on the computer can have only
a. one domain &one IP
b. more than one domain & more than one Ip
c. one domain and more than one IP
d. more than one domain & one IP

32-Which one does not have file descriptor ?
a. process
b. keyboard
c. pipe
d. socket

33-What does CONNECT BY means
a.connect to a different databaser for retreiva
b.arrange in tree ordered structure

34-In two phase commit protocol, why log is used during transmission &reception ?
a. To retrieve the status in case of crash

35-In which algo. Waiting time is minimun?

Ans, SJF

36-How many address bits are there in Ipv6
ans. 128 bits

37-During run time heap is managed by
a. a user process in kernel mode
b. A system process manages heap for all the processes
c. A system process for each process
d. A user process in user mode

38-In which of following search is efficient?
a. height balanced tree
b. Weight balanced tree
c. Binary tree

39.A question. on resource relocation, sharing ( I don't remember more than this regarding this ques.)

40-some question. options were sth like
a. transparency control
b. Migration control
c. Concurrency control

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