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Placement Materials & Answers-Free Download


Software Companies Placement Papers-Hughes-Free Download

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

a.Java's executable code is downloaded and running on the m/c

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.

29-What is dirty read?

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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