Operating System (O.S) MCQ's




Question 1 :
Contiguous allocation of a file is defined by _____________

  1. disk address of the first block - length
  2. length - size of the block
  3. size of the block
  4. total size of the file
  

Question 2 :
the operating system is the most common type of ____ software

  1. communication
  2. application
  3. system
  4. word processing software
  

Question 3 :
Two ways to arrange multiple windows on the desktop are

  1. drag and drop
  2. cascade and tile
  3. minimize and maximize
  4. point and click
  

Question 4 :
Consider an operating system running multiple processes that have exclusive resource requirements from a set of resource classes. Further assume that there is exactly one resource in each resource class. Then, a directed cycle in the resource allocation graph would indicate which one of the following?

  1. A deadlock might occur in the future.
  2. All processes are deadlocked.
  3. Some processes are deadlocked.
  4. The system is safe from deadlock.
  

Question 5 :
What is the default maximum number of processes that can exist in Linux?

  1. 32767
  2. 1
  3. 0
  4. 1024
  

Question 6 :
An interactive user or a process has associated with pathname is a current directory which is often referred to as the …………………

  1. update directory
  2. list directory
  3. working directory
  4. create directory
  

Question 7 :
Files that maintain the hierarchical structure of the file system.

  1. Descriptors
  2. Directories
  3. Modifiers
  4. Relative files
  

Question 8 :
When one process is executing in critical section then all other processes that intend to execute the critical section must wait for the process (inside the critical section) to leave the critical section is called _____________

  1. Hold and Wait policy
  2. Mutual Exclusion property
  3. No-preemption policy
  4. FCFS policy
  

Question 9 :
Typically, ………………… is on an individual block basis where each block contains a pointer to the next block in the chain.

  1. Chained allocation
  2. Indexed allocation
  3. Contiguous allocation
  4. Variable allocation
  

Question 10 :
When the process issues an I/O request :

  1. It is placed in an I/O queue
  2. It is placed in a waiting queue
  3. It is placed in the ready queue
  4. It is placed in the Job queue
  

Question 11 :
Which of the following isn’t a part of the file directory?

  1. Attributes
  2. Protocol
  3. Location
  4. Ownership
  

Question 12 :
We describe a protocol of input device communication: a. Each device has a distinct address b. The bus controller scans each device in sequence of increasing address value to determine if the entity wishes to communicate. c. The device ready to communicate leaves it data in IO register. d. The data is picked up and the controller moves to step-a above. Identify the form of communication best describes the IO mode amongst the following

  1. Programmed IO Mode
  2. Polling
  3. DMA
  4. Interrupt Mode
  

Question 13 :
_________Operating systems are scalable and fault tolerant.

  1. Network
  2. Distributed
  3. Real-Time
  4. Batch
  

Question 14 :
In PCB, This includes the amount of CPU used for process execution, time limits, execution ID etc.

  1. IO status information
  2. CPU Scheduling Information
  3. CPU registers
  4. Accounting information
  

Question 15 :
Which of the following is false regarding First Come First Serve (FCFS)?

  1. FCFS performance is high
  2. average wait time is high.
  3. Its implementation is based on FIFO queue.
  4. FCFS is easy to understand and implement.
  

Question 16 :
The process of temporarily removing inactive programs from the main memory of a computer system is known as

  1. Swapping
  2. Compaction
  3. mapping
  4. fragmentation
  

Question 17 :
Windows 95, Windows 98, Windows NT are known as

  1. Operating systems
  2. Modems
  3. Domain names
  4. Processors
  

Question 18 :
Parameters of Programs are passed in

  1. input
  2. output
  3. program
  4. register
  

Question 19 :
Indexed allocation ..... direct access.

  1. supports
  2. does not support
  3. is not related to
  4. ignores
  

Question 20 :
Which one of the following error will not be handle by the operating system?

  1. power failure
  2. lack of paper in printer
  3. connection failure in the network
  4. Hardware issues
  

Question 21 :
Access to moving head disk requires three periods of delay before information is brought into memory. The response that correctly lists the three time delays for the physical access of data in order of the relative speed from the slowest to fastest is

  1. Latency Time, Cache Overhead Time, Seek Time
  2. Transmission Time, Latency Time, Seek Time
  3. Seek Time, Latency Time, Transmission Time
  4. Cache Overhead Time, Latency Time, Seek Time
  

Question 22 :
Which of the following is not a feature of UNIX?

  1. multitasking
  2. multiuser
  3. portability
  4. easy to use
  

Question 23 :
Determine the number of page faults when references to pages occur in the following order : 1, 2, 4, 5, 2, 1, 2, 4. Assume that the main memory can accommodate 3 pages and the main memory already has the pages 3 and 2, with page 3 having been brought earlier than page 2. (LRU algorithm is used)

  1. 3
  2. 5
  3. 4
  4. 8
  

Question 24 :
A set {P0, P1, ..., Pn} of waiting processes must exist such that P0 is waiting for a resource held by P1, P1 is waiting for a resource held by P2, ..., Pn−1 is waiting for a resource held by Pn, and Pn is waiting for a resource held by P0.

  1. Mutual exclusion
  2. Circular wait
  3. Hold and wait
  4. No Preemption
  

Question 25 :
Working set model for page replacement is based on the assumption of ____________

  1. modularity
  2. locality
  3. globalization
  4. random access
  
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