CLASS – XII Practicals: 30 Marks Theory: 70 Marks CLASS – XII (Theory) COMPUTER SCIENCE Text Book: Computer Science with JAVA (A Textbook for class XII) By Sumita Arora Dhanpat Rai & Co. Where can I find Sumitra Arora's textbooks for computer science for. Book written by Sumita Arora, for Class 11 and 12. Class 11 and class 12 books in PDF.

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Q15.Explain briefly the features carried out by an operating program as processor supervisor? As the name itself indicates, Processor Administration means managing the process or processor that is certainly, the CPU. Thus, this very function is also termed as Central processing unit Arranging.

Multiprogramming, certainly, increases the general efficiency of the computer system by obtaining more function performed in much less period as the CPU may be provided among a amount of energetic programs which are present in the memory space at the same time. While Processor is executing a job, it offers to wait around for the work; if the job requires certain Input/output operation, the CPU waits for the Input/output procedure to obtain over and that wait around time is CPU'beds idle time. In location of making CPU sit down idle, another job takes over the use of Central processing unit, increasing effectiveness thereby and reducing CPU idle time. The advantages of multiprogramming are usually as follow:. Improved CPU utilization. Higher total work throughput. What types of services are offered by an operating program?

Some common services provided by operating program can end up being listed as follow: (i) System Delivery (ii) Managing Insight/output Functions (iii) Manipulation of Document System (iv) Mistake Recognition and Dealing with (v) Reference Percentage (vi) Construction (vii) Details and Source Defense (i) Plan Execution The Operating Program is accountable for performing various programs whether consumer applications or program programs that is, special programs required for the device working. (ii) Managing Insight/output Functions The Operating System is accountable for managing various type of inputs ( For instance, input from keyboard, input from mouse etc.) and different forms of results in the suitable way. For example, if the input is coming from mouse, then it requires different type of dealing with as compared to insight coming from keyboard. Similarly, if an result focused for printer, then it requires different kind of dealing with as compared to output aimed for keep track of. (iii) Adjustment of File Program This task consists of the getting of choices relating to the storage of files that is, where (whether on floppy disk or tough disc etc.) and how a particular file is usually to become stored.

(iv) Mistake Detection and Handling The Operating Program is also accountable for discovering any type of error that occurs and then properly dealing with it. (sixth is v) Resource Portion This task aims at appropriate make use of of sources accessible. For example, if multiple files are usually to become printed after that “how and in which order this job will get place?” will end up being made a decision by the operating program. (vi) Shipping The Operating Program helps to keep an accounts of what kind of working is using place and what kind of mistakes have occurred. (vii) Info and Resource Security The Operating System is responsible for making sure that the details and resources accessible on device are used in the right method. The operating program foils the efforts to make use of them incorrectly. All these solutions are made certain by the features provided c an operating system.

Dvantages and disadvantages of metropolitan area network pdf. Definition MAN Metropolitan area network or shortened by MAN. A network in a city with high speed data transfer. Definition, advantages and disadvantages of LAN. Answer (1 of 2): A Metropolitan Area Network (MAN) is normally composed of a number of smaller Local Area Networks (LANs), which will typically be linked together using high-bandwidth technology such as fibre-optic cable. A Metropolitan Area Network (MAN) is normally composed of a number of smaller Local Area Networks (LANs), which will typically be linked together using high-bandwidth technology such as fibre-optic cable. What are the advantages and disadvantages of metropolitan area networks? The advantages of a metropolitan area network? What are the disadvantages of a network? Advantages and disadvantages of metropolitan area network pdf.

The functions offered by different operating program differ from one operating system to another, but more or less they offer the exact same services. These OS (Operating Program) features are provided for the convenience of the developer, to make the development job easier. (i) Provide procedure to produce a new folder in Home windows XP. (ii) Provide treatment for shutting down the Windows XP.

To produce a fresh folder. Double-click My Pc, and after that double-click the storage travel or foIder in which yóu desire to place the new folder. Click on Document->New, and then click Folder. Type the name of the new folder, and after that press ENTER. The new folder appears in area you chosen. To close down your computer,. Click the Start key, and after that click Shut Straight down.

The Shut Down Home windows dialog box pop upward. Click on at Shut Down stereo key and click Okay. (To restart your computer, click at Restart stereo key and click Alright). Discuss some advance features of Home windows XP. Home windows XP has got some extremely useful functions that add more to its usér-friendliness. A few of them are usually as follow:.

The Desktop In Home windows Operating System, the screen upon which symbols, Windows, etc. Are usually displayed is definitely recognized as desktop. The Windows Operating System desktop may include a background, one or even more energetic or inactive home windows, a taskbar, and symbols. A history can be anything from á single-color display screen to an intricate artistic picture. All windows and symbols are superimposed on the background, whether it may be. The Window A windows is certainly a regular rectangular region pertaining to an application or a record or a dialog. Following are usually the types of home windows: (i) The Software Home window (ii) The Document Windowpane The Program Window An software window contains an open up program that is, a running application such as Phrase or Paint.

Several applications can be open up or running concurrently, but there is certainly just one active windows at any given time. An application window offers many components: the title club, the menus pub, the work area, the scroll club, and the edges and edges. Each of these are usually as follow:. The Program Symbol It is the image addressing the open program.

When you click at application image, a pull-down control menu appears which is also called system menu. Control menu options differ, depending upon the type of application being shown in the window. Maximize/Restore This switch is used to restore an bigger windows to its earlier size or vice vérsa. Minimize This key decreases the active home window to a key in the taskbar.

Close Choosing this button deactivates the active windowpane from the desktop computer. Window Title and Dynamic File Title Along with the name of the software, title club also includes the name of file shown in the program workspace. The Menus Club The menu club for an program window can be a horizontal bar just below the title club. The menu bar lists the selections available for that application. Selecting an option from the menus bar results in a pull-down menus. The Work area This is definitely the region in a windows below the name club and menu club.

Everything that relates to the current application is usually shown in the workspace. The Scroll Pubs Depending on the size of a windows, the entire application may not really be noticeable. When this occurs, the window is equipped with Vertical and/or Horizontal Scroll pubs. Each scroll pub contains a scroll container and two scroIl arrows (one up and one down). Keyboard movement keys or mouse can end up being used to shift scroll package up/down or left/right on a scroll pub to display other components of the application. Sides and Edges To resize a home window, use the mouse and point to a window's boundary or corner.

The mouse cursor modifications to a dual arrow when positioned over a boundary or corner. Drag the border or part in the path pointed out by the dual arrow to the desired shape. (ii) The Record Home window The document windows are the windows within an program windows. These are usually displayed in the parent application windows's work area.

The Symbols As you understand, icons are usually the pretty pictures symbolizing Windows elements like files, files, cutting corners etc. Symbols play a quite important function in graphical consumer interfaces.

Commonly used symbols are usually: program icons, shortcut symbols, document icons, and disk-drive symbols. These are: (i) Program Symbols These are usually the visual renderings of the software program package deal's logo. If you twice click over this symbol, the associated application will get invoked. (ii) Shortcut Symbols These are little images directed to a particular application, record or folder etc. By dual clicking over them the concerned application/document/folder etc. Will become energetic.

(iii) Record Symbols The energetic document home window, which can be a screen within an program window, can be minimized to a record icon. Stage and double-cIick on the record image to regain the document windowpane. (iv) Disk-drive Symbols The disk-drive icons graphically signify five disk-drive choices: floppy drive, hard-disk, system, RAM, and CD-R0M. The floppy disc (A:), hard storage (C:) ánd CD-R0M (D:) icons resembIe the faceplates óf cd disk drives. Generally, PCs have only one or two floppy drives, designated to A and T.