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Operating System

Operating System Concepts

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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following system calls is a type of information maintenance system call?

  1. WaitForSingleObject()
  2. CloseHandle()
  3. Sleep()
  4. MapViewOfFile()
  5. WriteConsole()
Question 2 Multiple Choice (Single Answer)

Control of nuclear power plants, oil refining and chemical processing are examples of

  1. batch processing system
  2. real-time system
  3. interactive processing
  4. real-time transaction system
  5. offline processing system
Question 3 Multiple Choice (Single Answer)

CPU scheduler is also known as

  1. long term scheduler
  2. middle term scheduler
  3. scheduler
  4. short scheduler
  5. process scheduler
Question 4 Multiple Choice (Single Answer)

Which of the following statements is/are true?

I. Real-time operating system does processing according to time interval.
II. It has two types: one is hard time and another is soft time operating system.
III. In hard real-time systems, secondary storage is not limited.
IV. Real-time processing is always online whereas online system need not be real-time.

  1. I and III
  2. I, II and III
  3. I, II and IV
  4. I and IV
  5. II, III and IV
Question 5 Multiple Choice (Single Answer)

Which of the following is a system threat?

  1. Trojan horse
  2. Logic bomb
  3. Virus
  4. Worm
  5. Trap door
Question 6 Multiple Choice (Single Answer)

Find out the wrong statement(s) about scheduler.

I. Short term scheduler is the fastest among the other two.
II. Long term scheduler is a part of the time sharing systems.
III. Middle term scheduler reduces the degree of multiprogramming.
IV. Long term scheduler controls the degree of multiprogramming.

  1. Only I
  2. Only II
  3. Only III
  4. Both II and III
  5. Only IV
Question 7 Multiple Choice (Single Answer)

When a program traps user login credentials and stores them to send to malicious user, who can later on login to computer and can access system resources, then it is called

  1. trap door
  2. trojan horse
  3. virus
  4. logic bomb
  5. port scanning
Question 8 Multiple Choice (Single Answer)

In which partitioning can the space allocations be conveniently handled in sizes of power of 2?

  1. Fixed partition
  2. The buddy system of partitioning
  3. Variable sized partition
  4. Horizontal partition
  5. Vertical partition
Question 9 Multiple Choice (Single Answer)

Which of the following methods is used for deadlock prevention?

  1. Wait-die scheme
  2. Wait for graph
  3. Roll back
  4. Thomas Write rule
  5. Resource allocation graph algorithm
Question 10 Multiple Choice (Single Answer)

Identifying each user of the system and associating the executing programs with those users is known as

  1. one time password
  2. program threat
  3. authentication
  4. system threat
  5. computer security classification
Question 11 Multiple Choice (Single Answer)

Formula time (process completed) – time (process submitted) is used for calculating

  1. waiting time
  2. turnaround time
  3. response time
  4. throughput
  5. processor utilisation
Question 12 Multiple Choice (Single Answer)

When a process goes from running state to ready state, then the transition is called

  1. dispatch
  2. time-run-out
  3. wakeup
  4. admitted
  5. block
Question 13 Multiple Choice (Single Answer)

_____ determines where a process piece is to reside in real memory.

  1. Fetch policy
  2. Placement policy
  3. Replacement policy
  4. Clock policy
  5. Cleaning policy
Question 14 Multiple Choice (Single Answer)

A context switch occurs due to interrupt (clock or I/O), trap or system call. If the instruction being executed has any error or exception, it is called

  1. trap
  2. clock interrupt
  3. I/O interrupt
  4. memory fault
  5. system call
Question 15 Multiple Choice (Single Answer)

Which of the following is an advantage of time-sharing operating systems?

  1. They need regular maintenance and updates.
  2. They reduce CPU idle time.
  3. They are not reliable.
  4. They reduce the load on the host computer.
  5. Centralised servers are highly stable.
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