A program in high level language kept on disk

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

A
12.8 ms
B
11.8 ms
C
10.8 ms
D
9.8 ms

Question 2

Process is:

A
A program in high level language kept on disk
B
Contents of main memory
C
A program in execution
D
A job in secondary memory

Question 3

The performance of Round Robin algorithm depends heavily on

A
size of the process
B
the I/O bursts of the process
C
the CPU bursts of the process
D
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.

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

Question 6

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

A
Wake up: ready → running
B
Dispatch: ready → running
C
Block: ready → running
D
Timer runout: ready → running

Question 7

What is the primary purpose of a VLAN?

A
Demonstrating the proper layout for a network
B
Simulating a network
C
To create a virtual private network
D
Segmenting a network inside a switch or device

Question 8

Which of the following is a MAC address?

A
192.166.200.50
B
00056A:01A01A5CCA7FF60
C
568, Airport Road
D
01:A5:BB:A7:FF:60

Question 9

The address resolution protocol (ARP) is used for

A
Finding the IP address from the DNS
B
Finding the IP address of the default gateway
C
Finding the IP address that corresponds to a MAC address
D
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

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