which company created the first operating system?

Which of these is not a function of an OS:

What do device drivers do?

Which of these is an advantage to using a command-line interface over a GUI?

What type of operating system is Windows 10?

What do device drivers do?

What type of operating system is Windows 10?

The program in our operating system always deals with what address?

Click on all the examples of Operating Systems

To access the services of operating system, the interface is provided by the ___________

The primary purpose of an operating system is:

The strategy of allowing processes that are logically runnable to be temporarily suspended is called

Semaphores are used to solve

Only the process executing the critical section is allowed access to the shared variable,all other processes should prevented from doing so until the completion of the critical section. This is often referred to as-

Banker’s algorithm is used as-

The ability for a computer to execute more than one task simultaneously

The operating system is a type of

Which is not a process state?

A signal sent by a hardware or software to CPU indicating that something needs attention

FCFS is operates similar to a

What is the most used operating system in the world?

1. What is an operating system?

1. What is an operating system?

2. What is the main function of the command interpreter?

3. To access the services of the operating system, the interface is provided by the ___________

4.  Where is the interrupt in operating system?

5. Which one of the following is not a real time operating system?

6. In a timeshare operating system, when the time slot assigned to a process is completed, the process switches from the current state to?

7. For an effective operating system, when to check for deadlock?

8. To recover from failures in the network operations _____________ information may be maintained.

9 The two steps the operating system takes to use a disk to hold its files are _______ and ________

10 In Unix, which system call creates the new process?

1) What is the use of directory structure in the operating system?

What is a program?

Where does the taskbar appear by default?

What manages the hardware and runs the software?

What is a good definition of software?

Earlier computer systems utilized Command Line Interface to tell a computer what to do, which interface does the computer utilize now?

What is accessibility?

Sometimes, the process in our system has pending I/O. When this thing happens, swapping _____ be done.

Which can the main memory take in it?

Which is faster than first-fit?

The program counter contains the location of the instruction being executed. The address is loaded into the memory address register of the memory. How do we refer that address?

The run-time mapping from virtual to physical addresses is done by a hardware device properly called:

The base register is also known as the:

In allocating address space to each process, what specifies the size of the range where that process can be allocated?

The _____ consists of all processes whose memory images are in the backing store or in memory and are ready to run.

The program in our operating system always deals with what address?

External fragmentation will not occur when:

1. What is an operating system?

2. What is the main function of the command interpreter?

3. To access the services of the operating system, the interface is provided by the ___________

4.  Where is the interrupt in operating system?

5. Which one of the following is not a real time operating system?

6. In a timeshare operating system, when the time slot assigned to a process is completed, the process switches from the current state to?

7. For an effective operating system, when to check for deadlock?

8. To recover from failures in the network operations _____________ information may be maintained.

9 The two steps the operating system takes to use a disk to hold its files are _______ and ________

10 In Unix, which system call creates the new process?

An operating system is the software that controls all the hardware. It acts as an _____________ between the user and the hardware and also between applications and the hardware.

What does an OS need to work well?

What is the most used operating system in the world?

What does an OS need to work well?

What is the most used operating system in the world?

Choose a characteristic of the meaning of open source.

The operating system helps to manage files

The operating system is in your mind

Operating systems allow you to interact with various devices

What year was unix created?

which company created the first operating system?

Do operating systems today have a graphical user interface (GUI)?

The first version of this operating system started out in 1985, offered as an extension of an already-existing MS-DOS disk operating system.

Being one of the earliest in the category of modern computer operating systems, UNIX was developed by Bell Laboratories researchers in the early ___

Windows is an example of an open source operating system.

Through this method, a hard drive can be divided into multiple logical storage areas which can then be used to install a different operating system

A group of software applications that manage the interactions between computer or mobile hardware

An area in a hard drive that is allotted for virtual memory

A segment of memory or storage in which items are placed while waiting to be transferred from an input device to an output device.

Tells the OS how to communicate with a specific device. All the devices that are connected into a computer needs it to communicate with the computer

Capable of handling a high volume of transactions in a multiuser environment and working with multiple processors

An open source, Linux-based mobile operating system designed by Google for smartphones and tablets

The practice of sharing or pooling computing resources, such as servers or storage devices

Share contacts and other information by touching two devices together

Causes a display's screen to show a moving image or blank screen if no keyboard or mouse activity occurs for a specified time.

Operating systems can include the following security tools, except:

A program that assesses and reports information about various computer resources and devices.

Which algorithm will minimum flow of time?

Round robin scheduling falls under :

From the time of submission of a process to the time of completion? The interval is termed as :

Which requested resources are granted with deadlock detection?

If a process is executing in critical section,then no other processes can be executing in their c.s :

In below mentioned options, which one is classical problems of synchronisation

Which one of the following is a Synchronisation tool ?

Mutual exclusive can be provided by the?

Process Synchronisation can be done on ..?

A running process is not interrupted by :-

The release of resource and request are?

For share able resources like printer, which condition should be used?

A process in OS uses resources in the foll way ?

A process that contain multiple threads?

When more than one processes access the same code segment is known as?

Which is used to implement the solution of critical section problems with multiple processes

Which is used to control access to a resource that has multiple instances

Methods of handling deadlocks?

Process initiation denial and resource allocation denial techniques comes under?

Deadlock is resolved by?

Race Condition, Critical section problem, Semaphores, Peterson's solution which all these comes under ?

Which problem is generalized in terms of producer - consumer problem:

The concept of multithreading needs proper understanding of these two terms?

Types of threads?

A resource can't be taken from a process unless the process release the resource:

Process execution consists of a cycle of _________ and ________.

CPU burst is followed by I/O burst.

In CPU Scheduling, CPU burst distribution is not the main concern.

Selects from among the processes in ready queue, and allocates the CPU to one of them.

CPU scheduling decisions may take place when a process:

Does not cut execution.

Cuts execution.

Gives control of the CPU to the process selected by the short-term scheduler.

Dispatcher includes:

What are the 5 scheduling criteria?

Keep the CPU as busy as possible.

# of processes that complete their execution per time unit.

Amount of time to execute a particular process.

Amount of time a process has been waiting in the ready queue.

Amount of time it takes from when a request was submitted until the first response is produced, not output (for time-sharing environment)

Scheduling Algorithm Optimization Criteria

Short process behind long process (applies to SJF, short process first)

Associate with each process the length of its next CPU burst.

A priority number (integer) is associated with each process.

The CPU is allocated to the process with the highest priority.

(smallest integer = highest priority)

SJF is priority scheduling where priority is the inverse of predicted next CPU burst time.

Low priority processes may never execute.

As time progresses increase the priority of the process.

Each process gets a small unit of CPU time, usually 10-100 milliseconds.

After this time has elapsed, the process is preempted and added to the end of the ready queue.

A small unit of CPU time (q).

System consists of resources and series of processes.

Resource types include:

Each process utilizes a resource as follows:

Is a situation where a set of processes are blocked because each process is holding a resource and waiting for another resource acquired by some other process.

What are the four conditions where deadlock can arise?

Only one process at a time can use a resource.

A process holding at least one resource is waiting to acquire additional resources held by other processes.

A resource can be released only voluntarily by the process holding it, after that process has completed its task.

There exists a set {P0, P1, …, Pn} of waiting processes such that P0 is waiting for a resource that is held by P1, P1 is waiting for a resource that is held by P2, …, Pn–1 is waiting for a resource that is held by Pn, and Pn is waiting for a resource that is held by P0.

A set of vertices V and a set of edges E.

Two types of edge in resource-allocation graph:

Directed edge P -> R

Directed edge R -> P

If graph contains no cycle?

If graph contains a cycle and only one instance per resource type

If graph contains a cycle and several instances per resource type

Ensure that the system will never enter a deadlock state through

(Deadlock prevention)

Must guarantee that whenever a process requests a resource, it does not hold any other resources.

(Deadlock prevention)

If a process that is holding some resources requests another resource that cannot be immediately allocated to it, then all resources currently being held are released.

Requires that the system has some additional a priori information available.

(Deadlock avoidance)

Simplest and most useful model requires that each process declare the __________________ of resources of each type that it may need.

It is defined by the number of available and allocated resources, and the maximum demands of the processes.

if there exists a sequence <P1, P2, …, Pn> of ALL the processes in the systems such that for each Pi, the resources that Pi can still request can be satisfied by currently available resources + resources held by all the Pj, with j < I.

If a system is in safe state

If a system is in unsafe state

Ensure that a system will never enter an unsafe state.

Single instance of a resource type.

Multiple instances of a resource type.

Multiple instances

Each process must a priori claim maximum use

When a process requests a resource it may have to wait 

When a process gets all its resources it must return them in a finite amount of time

What are the data structures needed for Banker's algorithm?

These are the instances of resource type available.

These are the most instances of resource type that the process can request.

These are the currently allocated resources.

Resources that the processes need to complete its task.

Need = Max - Allocated

Total Number of Resources = Total of each Resource Allocation + Available