ISRO CS 2020

Question 31

How many total bits are required for a direct-mapped cache with 128 KB of data and 1 word block size, assuming a 32-bit address and 1 word size of 4 bytes ?

• 2 Mbits
• 1.7 Mbits
• 2.5 Mbits
• 1.5 Mbits

Question 32

Properties of ‘DELETE’ and ‘TRUNCATE’ commands indicate that

• After the execution of ‘TRUNCATE’ operation, COMMIT and ROLLBACK statements cannot be performed to retrieve the lost data, while ‘DELETE’ allow it.
• After the execution of ‘DELETE’ and ‘TRUNCATE’ operation retrieval is easily possible for the lost data.
• After the execution of ‘DELETE’ operation, COMMIT and ROLLBACK statements can be performed to retrieve the lost data, while TRUNCATE do not allow it.
• After the execution of ‘DELETE’ and ‘TRUNCATE’ operation no retrieval is possible for the lost data.

Question 33

Remote Procedure Calls are used for

• communication between two processes remotely different from each other on the same system.
• communication between two processes on the same system.
• communication between two processes on separate system.
• None of the above.

Question 34

Consider the following recursive C function that takes two arguments

unsigned int rer (unsigned int n, unsigned int r) {
  if (n > 0) return (n% r + rer(n/r, r));
  else return 0;
 } 

What is the return value of the function rer when it is called as rer (513, 2) ?

• 9
• 8
• 5
• 2

Question 35

A given grammar is called ambiguous if

• two or more productions have the same non-terminal on the left hand side
• a derivation tree has more than one associated sentence
• there is a sentence with more than one derivation tree corresponding to it
• brackets are not present in the grammar

Question 36

What is the output of the code given below?

C

#include <stdio.h>
int main( )
 {
   char name[ ]=“satellites”;
   int len;
   int size;
   len = strlen(name);
   size = sizeof(name);
   printf(“%d”, len * size);
   return 0;
 }

• 100
• 110
• 40
• 44

Question 37

Checksum field in TCP header is

• ones complement of sum of header and data in bytes
• ones complement of sum of header, data and pseudo header in 16 bit words
• dropped from IPv6 header format
• better than md5 or sh1 methods

Question 38

If x + 2y = 30, then (2y/5 + x/3) + (x/5 + 2y/3) will be equal to

• 8
• 16
• 18
• 20

Question 39

For the distributions given below : Which of the following is correct for the above distributions ?

• Standard deviation of A is significantly lower than standard deviation of B
• Standard deviation of A is slightly lower than standard deviation of B
• Standard deviation of A is same as standard deviation of B
• Standard deviation of A is significantly higher than standard deviation of B

Question 40

The hardware implementation which provides mutual exclusion is

• Semaphores
• Test and set instruction
• Both options
• None of the options