Basic Computer: Operating System Basics MCQ — 15 Practice Questions with Answers

Explanation

The question asks for the incorrect statement. A GUI, or graphical user interface, is based on visual elements such as windows, icons, menus and a pointer. It is especially convenient when used with a mouse, touchpad or other pointing device, though keyboard navigation may also exist. A command-line interface, in contrast, depends mainly on typed commands. Therefore statements A, B and C are correct. Statement D wrongly says GUI can be used only without a mouse or pointing device, so D is the incorrect statement.

Explanation

An operating system is the main system software of a computer. The clue in the question is the word “role”, so the answer must describe broad management, not one narrow task. The OS allocates processor time and memory, controls input-output devices, manages files and gives applications a platform to run. A storage device only stores data, and a spreadsheet is just one application. Therefore option A correctly states the role of an operating system as a resource manager and working environment.

Explanation

The assertion is true because an operating system does not handle every hardware device in the same direct way. It uses device drivers for printers, scanners, display adapters and similar devices. The reason is also true: a driver is software written for a particular device or device class, and it tells the operating system how to control that hardware. Since this is exactly why drivers are needed in the assertion, the reason correctly explains the assertion. Therefore option A is the correct answer.

Explanation

The question asks for the incorrect statement. Operating systems provide file-management tools such as creating, copying, renaming and deleting files. Folders can hold files and subfolders, and file extensions usually indicate the file type. A shortcut, however, is only a link or pointer to a file, folder or program. Deleting the shortcut removes that link, not necessarily the original item. Therefore, the statement that deleting a shortcut always deletes the original file or program is incorrect.

Explanation

The operating system manages resources. It schedules processes for CPU time and allocates memory so that several programs can run in an organised way. That makes Statement 1 correct. Statement 2 is the trap: memory management does not mean creating extra physical RAM. Installed RAM capacity changes only by adding or replacing hardware. The stem asks for correct statements, so after accepting Statement 1 and rejecting Statement 2, the answer is Statement 1 only.