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Hughes Written Test 2009

Posted on :31-03-2016

Q1. 8 MB total memory, 256 kb cache, 4 kb is block size. Using direct mapping, how many different physical memory blocks can be mapped on to the cache?

a) 64   
b) 256   
c) 128


Q2. Object code does not require

a) relocation bits
b) external names and place where they are located
c) absolute address
d) all the object codes


Q3. What is the order of Hashing time?

a) 0(1)
b) 0(n2)


Q4. A chocolate of size n Xn is given and is to be made into pieces of size 1x1. At a time both horizontal and a vertical cut is done. Find the order of complexity.

a) O (n2)
b) O (n log n)
c) O (log n)


Q5. A and B are sets. As cardinality is m and Bs is n where m < n, how many one to one mappings can be obtained?

a) n ^ m
b) npm
c) mpn
d) mcn


Q6. Symmetric multiprocessing can be done in

a) snoopy protocols
b) cache coherence


Q7. 0 is represented as both and negative and positive in

a) ones complement
b) twos complement
c) twos complement has extra negative number


Q8. Which of the following is correct?

a) Synchronous transmission needs more bandwidth than Asynchronous.
b) In asychronous transmission, the time is associated with data itself.


Q9. In the process state cycle, which is the correct order?

a) timeout: ready -> running
b) blocked: ready -> running


Q10. What is the difference between C and C++?

a) In C++ we can define variables in the middle
b) dynamic scooping


Q11. For converting infix expression to postfix what do we require?

a) operand stack
b) operator stack


Q12. In scheduling algorithms which are logically executed but suspended?

a) preemptive
b) SJF
c) non preemptive
d) all the above


Q13. In the dining philosophers problems to avoid dead lock?

a) 1 person will take left one and all other will take right one
b) adjacent persons should not eat concurrently


Q14. I/O redirection is

a) copying programs files through a pipe
b) input files are created
c) input file taken from existing ones
d) none


Q15. What is the following code returns?

LXI sp, 2099h
LXI b, 2012h
PUSH b


Q16. AX = B. A is m Xn and B is m X1

a) there is a unique solution if rank of A is same as rank of augumented matrix [A b]
b) there are multiple solutions


Q17. Order of deleting a node from a linked list. (pointer is to an arbitrary node)

a) 0(1)
b) 0(n)


Q18. ARP is in reference to

a) MAC to IP
b) IP to MAC


Q19. Identify in which pass of the 2 pass compiler are the following compiled

a) literals
b) address resolution
c) listing


Q20. Find the probability of getting a number with 7 between 100 and 999 (both inclusive).


Q21. Which is not a memory management scheme?

a) buddy system
b) swapping
c) monitors
d) paging

ANS: c


Q22. There are 10 items in a box, out of which 3 are defective. 2 balls are taken one after the other. What is the probability that both of them are defective?


Q23. Simplify the Karnaugh map given below and derive its expression in SOP form

- 1 1 -
1 - - 1
1 - - 1
- 1 1 -


Q24. Context free grammar is accepted by

a) finite automata
b) push down automata
c) two way bounded automata
d) both b and c


Q25. CSMA/CD is used in

a) Token ring
b) FDDI
c) Ethernet


Q26. Given the following C program

func()
{
static int i = 10;
printf(%d,i);
i++;
}

What is the value of i if the function is called twice ?


Q27. What is Balanced tree? A balanced tree is given and a node is added at the leaf. Find the number of unbalanced nodes?


Q28. Given that:

s -> s + s ; s -> s * s ; s -> a

Find the number of parse trees for a+a*a+a.

a) 4
b) 5
c) 6
d) 7


Q29. Number of leaf nodes given. Find the number of nodes with degree 2.


Q30. A directed graph is represented by adjacency list. To find the complexity of in degree of the node. e - edge n- vertices


Q31. In a memory chip 4 k size and 16 bit words are to be stored. Number of address and data lines required is---.


Q32. Given page table, page size and offset find the corresponding physical address?


Q33. Given the following C program

func(int *i, int*j)
{*i=*i * *i;
*j=*j* *j;
}

main()
{ int i = 5, j = 2;
func(&i,&j);
printf(%d %d, i, j);}

What is the output?


Q34. Which is a good way of representing variables in recursion?

a) local variables
b) static variables
c) global variables


Q35. In TCP/IP header, checksum contains

a) sum of all the words
b) ones complement of the data
c) ones complement of the sum of all the words
d) ones complement of the sum in ones complement


Q36. What is the maximum number of acknowledgements for a 4 bit sequence number in a sliding window protocol?


  
   






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