ISRO CS 2009

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Question 1

Consider a set of 5 processes whose arrival time, CPU time needed and the priority are given below: 

Process       Arrival Time   CPU Time Needed     Priority
              (in ms)

P1              0             10                 5
P2              0             5                  2
P3              2             3                  1
P4              5             20                 4
P5              10            2                  3

(smaller the number, higher the priority) If the CPU scheduling policy is priority scheduling without preemption, the average waiting time will be

  • 12.8 ms

  • 11.8 ms

  • 10.8 ms

  • 9.8 ms

Question 2

Process is:

  • A program in high level language kept on disk

  • Contents of main memory

  • A program in execution

  • A job in secondary memory

Question 3

The performance of Round Robin algorithm depends heavily on

  • size of the process

  • the I/O bursts of the process

  • the CPU bursts of the process

  • the size of the time quantum

Question 4

Consider three CPU-intensive processes, which require 10, 20 and 30 time units and arrive at times 0, 2 and 6, respectively. How many context switches are needed if the operating system implements a shortest remaining time first scheduling algorithm? Do not count the context switches at time zero and at the end.

  • 1

  • 2

  • 3

  • 4

Question 5

The correct matching of the following pairs is 

(A) Disk check              (1) Roundrobin
(B) Batch processing        (2) Scan
(C) Time sharing            (3) LIFO
(D) Stack operation         (4) FIFO

  • A B C D
     3 4 2 1
  • A B C D
    4 3 2 1
  • A B C D
    3 4 1 2
  • A B C D
    2 4 1 3

Question 6

Which is the correct definition of a valid process transition in an operating system?

  • Wake up: ready → running

  • Dispatch: ready → running

  • Block: ready → running

  • Timer runout: ready → running

Question 7

What is the primary purpose of a VLAN?

  • Demonstrating the proper layout for a network

  • Simulating a network

  • To create a virtual private network

  • Segmenting a network inside a switch or device

Question 8

Which of the following is a MAC address?

  • 192.166.200.50

  • 00056A:01A01A5CCA7FF60

  • 568, Airport Road

  • 01:A5:BB:A7:FF:60

Question 9

The address resolution protocol (ARP) is used for

  • Finding the IP address from the DNS

  • Finding the IP address of the default gateway

  • Finding the IP address that corresponds to a MAC address

  • Finding the MAC address that corresponds to an IP address

Question 10

The five items: A, B, C, D, and E are pushed in a stack, one after other starting from A. The stack is popped four items and each element is inserted in a queue. The two elements are deleted from the queue and pushed back on the stack. Now one item is popped from the stack. The popped item is

  • A

  • B

  • C

  • D

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