ISRO CS 2017 - May

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Question 1

What does the following program do when the input is unsigned 16-bit integer?

C 
#include 
main( )
{
unsigned int num;
int i;
scanf (“%u”, &num);
for ( i = 0; i<16; i++)
{
printf (“%d”, (num << i & 1 << 15 ) ? 1:0);
}
}


  • It prints all even bits from num

  • It prints all odd bits from num

  • It prints binary equivalent of num

  • None of the above

Question 2

What is the output of the following program? 

main( )
{
int a = 10;
if ((fork ( ) == 0))
a++;
printf (“%d\\n”, a );
}

  • 10 and 11

  • 10

  • 11

  • 11 and 11

Question 3

Mutual exclusion problem occurs

  • Between two disjoint processes that do not interact

  • Among processes that share resources

  • Among processes that do not use the same resource

  • Between two processes that uses different resources of different machine

Question 4

A critical region

  • is a piece of code which only one process executes at a time

  • is a region prone to deadlock

  • is a piece of code which only a finite number of processes execute

  • is found only in windows NT operating system

Question 5

At particular time, the value of a counting semaphore is 10, it will become 7 after: (a) 3 V operations (b) 3 P operations (c) 5 V operations and 2 P operations (d) 2 V operations and 5 P operations Which of the following option is correct?

  • Only (b)

  • Only(d)

  • Both (b) and (d)

  • None of these

Question 6

An Ethernet frame that is less than the IEEE 802.3 minimum length of 64 octets is called

  • Short frame

  • Small frame

  • Mini frame

  • Runt frame

Question 7

The best data structure to check whether an arithmetic expression has balanced parenthesis is a

  • Queue

  • Stack

  • Tree

  • List

Question 8

The time complexity of computing the transitive closure of a binary relation on a set of n elements is known to be

  • O(n*log(n))

  • O(n3/2)

  • O(n3)

  • O(n)

Question 9

What does the following C-statement declare? int (*f) (int*);

  • A function that takes an integer pointer as argument and returns an integer

  • A function that takes an integer as argument and returns an integer pointer

  • A pointer to a function that takes an integer pointer as argument and returns an integer

  • A function that takes an integer pointer as argument and returns a function pointer

Question 10

Consider the following C function 

void swap ( int x, int y )
{
int tmp;
tmp = x;
x= y;
y = tmp;
}

In order to exchange the values of two variables a and b:

  • Call swap (a, b)

  • Call swap (&a, &b)

  • swap(a, b) cannot be used as it does not return any value

  • swap(a, b) cannot be used as the parameters passed by value

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