CS604 Solved Grand Quiz Spring 2021

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CS604 SOLVED MCQs

The section of code before the critical section is called                .

Entry section

An operating system is easily portable between varying hardware designs in______structural approach.

Micro kernels

The_________approach include the ease of extending the OS.

Micro kernel

Which of the following information is not displayed with top command?

Number of threads in a process

       Processes or threads often need access to shared data and shared resources.

Concurrent

In multi-threaded process thread () take two argument, they are used to take ______ and ______.

New thread ID, process name

Cooperating processes never share any data, code, memory or state.

False

To terminate a process <ctrl-c>is pressed, which signal it actually pass to process for termination?

SIGINT

UNIX System V scheduling uses queues, which run   ____________  algorithm.

Round Robin

First     entries in Per Process File Descriptor Table are used as soon as the process is created.

3

Which part of the computer system helps in managing the file and memory management system?

Operating System

Batch programs are usually ______ programs.

Non-interactive

Is a solution to critical section problem?

Lamppost’s bakery algorithm

Which scheduling algorithm allocates the CPU first to the process that request the CPU first?

First-come, First-served scheduling

In Bakery algorithm, process are prioritized based on highest ticket number among competing processes.

False

The solution type where in critical section we use “entry section and “exit section” is called kind of                .

Software Solution

How many modes are supported in operating system?

2

Which of the following is used to show the end of file in UNIX?

Ctrl + E

Scheduler selects the process from the job pool and put them in main memory.

Long term

A parent process calling _____system call will be suspended until children-processes terminate.

Time

  _______ is used to request the OS by the process to take an I/O or initiating child process.

System call

Which is not basic computing hardware?

Compact Disc

The ______________ defines an operating system as a bridge between computer user and

hardware for a user’s convenience.

Top-down view

You can use the mv file1 file2 command to move             .

File1 to file2

______ are used by shell commands to pass data from one shell pipeline to another, without creating temporary files.

Pipes

____ system call is used to create a child process.

Fork

The kernel is a computer program that manages ______ requests from software.

Process

The problem with priority scheduling algorithm is                     .

Starvation

POSIX is a standard developed by              .

ISO

_______command display the status of a process.

Ps

______________ algorithm is used for solving n-process critical section problem.

Bakery

Bounded Buffer is a buffer of______size.

Fixed

The wait operation of the semaphore basically works on the basic_______system call.

Block ()

The priority of a process can be changed using________ command.

Nice

In ______addressing, the recipient is not required to name the sender.

Asymmetric

The priorities of processes in the________group remain fixed.

Kernel

The situation in which no context switching is required in multiprocessor systems is referred to as.

Spin lock

After fork() system call is made, parent and child process have their separate copy of      .

File descriptors

In operating system, ________ command is used to copy files to same location or different location.

Both Copy and CP

When sender never block because it has an infinite length storage area, then it means it is holding a queue of          capacity.

Unbounded

  scheduling algorithm can be preemptive or non-preemptive.

Shortest Job First

In indirect communication between processes P and Q              .

There is a mailbox to help communication between P and Q

A process is              if it cannot affect or be affected by any other process executing in the system.

Independent

______       command is used to change the directory.

cd

The nice value helps in assigning              to a process.

Priority

A major problem with priority scheduling is                 .

Starvation

You can have a thread within the same process by using the                 system call.

pthread_join()

In Unix/ Linux, by default the standard output file is attached to the               .

Screen

Swapper is also termed as Short term scheduler.

True

State of a process transits from running to ready because of           .

Interrupt

A solution to the critical section problem must satisfy the following requirements except

Race condition

The correct command for compiling C program named program.c in Linux environment is

gcc program.c –o FirstPrgram

The ready queue in RR scheduling algorithm is referred to as            .

Time Quantum

A          is an integer variable that, apart from initialization is accessible only through standard atomic operations.

Semaphore

The link between two processes P and Q to send and receive messages is called         .

Communication link

TestAndSet instruction is executed         .

None of the mentioned

As a result of <Ctrl-C>, a SIGINT signal is sent to a process, Signal number for SIGINT is      .

2

  integer shows the highest priority of a process in CPU scheduling.

Small

System calls provide the interface between a_______and the operating system.

Process

The kernel is________ user threads.

Unaware of

The          process creates two FIFOs, FIFO1 and FIFO2, and opens FIFO1 for reading and FIFO2 for writing.

Server

Which of the following statement is not true regarding the cooperating processes?

It may effect or be affected by any other process executing in the system

A Process ‘A’ that has finished working but its parent process has also finished its execution. In this state the process ‘A’ will be called as        process.

Zombie

In which of the following system multiple user are allowed to used the computer simultaneously?

Multi users

When a process has undivided access to a shared piece of code then no other process can execute this code, this state is called              .

Mutual exclusion

    scheduling algorithm is sometimes called shortest remaining time first scheduling algorithm.

Preemptive Shortest Job First

In multilevel queue-scheduling algorithm the highest priority is given to            .

System processes

A parent process calling_________system call will be suspended until children process terminates.

Wait

The process of switching from one process to another is called latency.

False

Linux uses ____________ directory to store system configuration files.

/etc

_____________ processes or threads often need access to shared data and shared resources.

Concurrent

If size of a process is 376052 bytes and its smallest physical memory address is 242785. Its address space cannot exceed beyond ________________

• 376053
• 376051              NOT SURE
• 618836
• 618838

If your processor does not have two slots empty in Per Process File Descriptor Table, then your_____ system call will fail.

PIPE

How many modes are supported in operating system?

2

1. The creating process is called a _________ process while the new processes are called the _______ of that process

Parent , Children

A process ‘A’ that has finished working but its parent has also finished its execution. In this state the process ‘A’ will be called as _______ process.

ZOMBIE

____________ command is used to change the directory.

CD

State of a process transits from running to ready because of           .

Interrupt

______________ is not a system call in Linux.

Mkfifo

For reading input, which of the following system call is used?

Read

Which of the following conditions must be satisfied to solve the critical section problem?

• Mutual exclusion
• Progress
• Bounded waiting
• All of the mentioned

The region in the memory that a process is allowed to access is known as process        .

Address Space

___________ scheduling algorithm is sometimes called shortest remaining time first scheduling algorithm.

Preemptive Shortest Job First

A signal is an event generated to get attention of

Process

The _____________ approach include the ease of extending the OS.

Micro Kernel

OS helps manages the following except

Bus speed of the System

The file descriptor for Standard input (stdin) is _____________

0

Which is not a parameter of pthread_creaate().

Return Status

In _________ inter process communication, a sender mention the name of the recipient.

DIRECT

Multi-threading model provides full concurrency.

One-to-One

__________ is used in real time operating systems.

NON-Preemptive Scheduling

Shortest remaining time first scheduling is referred to as shortest job first scheduling algorithm.

False

UNIX System V scheduling uses queues, which run ____________ algorithm.

Round Robin

For undivided and uninterrupted testing and setting of semaphore, uni-processor systems tend to___________________

Disable Interrupt

The section of cose before the critical section is called

Entry Section

For reading input, which of the following system call is used?

Read

The address generated by the CPU, after any indexing or other addressing-mode arithmetic, is called a _________ address, and the address it gets translated to by the MMU is called a _________ address.

Virtual, physical

 Deadlock can be deal with ________ ways.

3

 The integer value of ________ semaphores can not be greater than 1.

Binary

 DOS is a single user operating system.

                True

 Round Robin algorithm is similar to __________ scheduling but preemption is added to switch between processes.

First Come First Serve

 ________ algorithm is used in Deadlock avoidance.

Banker’s

 What do we name to an address that is generated by the CPU?

Logical address

 If validation bit is 0, it indicates a/an ________ state of segment.

Illegal

 Semaphores are used to synchronize ________ processes.

  Concurrent

 The collection of processes that is waiting on the disk to be brought into the memory for execution forms the ________.

Input queue

When process opens its first file explicitly it will get descriptor number ________.

                         1

 If a process continues to fault, replacing pages, for which it then faults and brings back in right away. This high paging activity is called _________.

thrashing

 Which part of the computer system helps in managing the file and memory management system?

Operating System

The ________ is a single program that produces an object file.

Compiler

Physical memory is broken down into fixed-sized blocks, called ________ and Logical memory is divided into blocks of the same size, called _________.

Frames, pages

 Shared libraries and kernel modules are stored in __________ directory.

/lib

  You can use the mv file1 file2 command to move __________.

file1 to file2

 A solution to the critical section problem must satisfy the following requirements except

Race Condition

 _________ is a piece of code in a cooperating process in which the process may updates shared data (variable, file, database, etc.)

Critical Section

Main memory is ________ memory.

Volatile

Which command display permissions and some other attributes for prog1.c in your current directory?

Page offset

_________ indicates size of the page table.

Page offset

 A process is said to be in critical section if it executes code that manipulates shared data.

True

The set of all physical addresses corresponding to the logical addresses is a ________ of the process.

Physical address space

When a ________link is created, a directory entry for the existing file is created

Hard

If a system is not in a safe state, there can be NO deadlocks.

False

________ consists of a large array of words or bytes, each with its own address.

Memory

 _________ command is used to change the directory.

cd

The segment table maps the ___________ to physical addresses.

If a system is not in a safe state, there can be no deadlocks.

False

Banker’s algorithm is used for ________.

Deadlock avoidance

 Deadlock ________ provides a set of methods for ensuring that at least one of the necessary conditions cannot hold.

Prevention

 A modification of free-list approach in free space management is to store the addresses of n free blocks in the first free block, known as _________.

grouping

The process id returned to the child process after successful fork system call execution is __________.

0

A parent process calling _________ system call will be suspended until children process terminates.

exit

An acyclic graph does not allow directories to have shared subdirectories and files.

False