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- Question 1 of 17
##### 1. Question

Consider the following transactions with data items P and Q initialized to zero:

T1 :read (P);

read (Q);

if P = 0 then Q := Q + 1 ;

write (Q).

T2 : read (Q);

read (P);

if Q = 0 then P := P + 1 ;

write (P).

Any non-serial interleaving of T1 and T2 for concurrent execution leads toCorrectIncorrect - Question 2 of 17
##### 2. Question

Consider the 3 processes, P1, P2 and P3 shown in the table.Process Arrival time Time Units Required

P1 0 5

P2 1 7

P3 3 4

The completion order of the 3 processes under the policies FCFS and RR2 (round robin scheduling with CPU quantum of 2 time units) areCorrectIncorrect - Question 3 of 17
##### 3. Question

Fetch_And_Add(X,i) is an atomic Read-Modify-Write instruction that reads the value of memory location X, increments it by the value i, and returns the old value of X. It is used in the pseudocode shown below to implement a busy-wait lock. L is an unsigned integer shared variable initialized to 0. The value of 0 corresponds to lock being available, while any non-zero value corresponds to the lock being not available.

AcquireLock(L){

while (Fetch_And_Add(L,1))

L = 1;

}

ReleaseLock(L){

L = 0;

}

This implementationCorrectIncorrect - Question 4 of 17
##### 4. Question

Suppose a fair six-sided die is rolled once. If the value on the die is 1, 2, or 3, the die is rolled a second time. What is the probability that the sum total of values that turn up is at least 6?

CorrectIncorrect - Question 5 of 17
##### 5. Question

An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20. The ISP wants to give half of this chunk of addresses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of addresses to A and B?

CorrectIncorrect - Question 6 of 17
##### 6. Question

Suppose a circular queue of capacity (n −1) elements is implemented with an array of n elements.Assume that the insertion and deletion operations are carried out using REAR and FRONT as array index variables, respectively. Initially, REAR = FRONT = 0. The conditions to detect queue full and queue empty are

CorrectIncorrect - Question 7 of 17
##### 7. Question

How many onto (or surjective) functions are there from an n-element (n >= 2) set to a 2-element set?

CorrectIncorrect - Question 8 of 17
##### 8. Question

A file system with 300 GByte disk uses a file descriptor with 8 direct block addresses, 1 indirect block address and 1 doubly indirect block address. The size of each disk block is 128 Bytes and the size of each disk block address is 8 Bytes. The maximum possible file size in this file system is

CorrectIncorrect - Question 9 of 17
##### 9. Question

Consider the virtual page reference string

1, 2, 3, 2, 4, 1, 3, 2, 4, 1

on a demand paged virtual memory system running on a computer system that has main memory size of 3 page frames which are initially empty. Let LRU, FIFO and OPTIMAL denote the number of page faults under the corresponding page replacement policy. ThenCorrectIncorrect - Question 10 of 17
##### 10. Question

Suppose you break a stick of unit length at a point chosen uniformly at random.Then the expected length of shorter stick is

CorrectIncorrect - Question 11 of 17
##### 11. Question

Consider the following system of equations:

3x + 2y = 1

4x + 7z = 1

x + y + z = 3

x – 2y + 7z = 0

The number of solutions for this system isCorrectIncorrect - Question 12 of 17
##### 12. Question

The value of the dot product of the eigen vectors corresponding to any pair of different eigenvalues of a 4-by-4 symmetric positive definite matrix is

CorrectIncorrect - Question 13 of 17
##### 13. Question

The base (or radix) of the number system such that the following equation holds is

312 / 20 = 13.1

CorrectIncorrect - Question 14 of 17
##### 14. Question

A machine has a 32-bit architecture, with 1-word long instructions. It has 64 registers, each of which is 32 bits long. It needs to support 45 instructions, which have an immediate operand in addition to two register operands. Assuming that the immediate operand is an unsigned integer, the maximum value of the immediate operand is

CorrectIncorrect - Question 15 of 17
##### 15. Question

Consider the following program in C language:

#include

main()

{

int i;

int *pi = &i;

scanf(“%d”,pi);

printf(“%d\n”, i+5);

}

Which one of the following statements is TRUE?CorrectIncorrect - Question 16 of 17
##### 16. Question

Let G be a graph with n vertices and m edges. What is the tightest upper bound on the running time of Depth first search on G when G is represented as an adjacency matrix?

CorrectIncorrect - Question 17 of 17
##### 17. Question

Let P be a quick sort program to sort numbers in ascending order using the first element as the pivot.Let t1 and t2 be the comparisons made by P for the inputs [1 2 3 4 5] and [4 1 5 3 2] respectively.Which of the following holds?

CorrectIncorrect