Question Discussion & Solution

the correct answer is MS-DOS.

MS-DOS is not a GUI-based operating system

Key Points

• MS-DOS is a text-based operating system, meaning that a user works with a keyboard to input data and receives output in plain text. Later, MS-DOS often had programs using a mouse and graphics to make work more simple and quick.
• MS-DOS is a non-graphical command line operating system derived from 86-DOS that was created for IBM-compatible computers.
• MS-DOS allows the user to navigate, open, and otherwise manipulate files on their computer from a command line instead of a GUI like Windows.

Important Points

• Some popular, modern graphical user interface examples include:
  • Microsoft Windows,
  • macOS, Ubuntu Unity,
  • GNOME Shell for desktop environments, and
  • Android,
  • Apple's iOS,
  • BlackBerry OS,
  • Windows 10 Mobile,
  • Palm OS-WebOS, and
  • Firefox OS for smartphones.

​Additional Information 

• Graphical User Interface (GUI) 
  • The graphical user interface is used by the most commercially popular computer operating systems 
  • A Graphical User Interface (GUI) allows you to enter commands by pointing and clicking at objects that appear on the screen.
  • It consists of picture-like items (icons and arrows for example).
  • In most operating systems, the primary user interface is graphical.

The correct answer is Virus.

• A disruptive program that spreads from program to program or from disk to disk is known as a Virus.
• A computer virus is designed to spread from host to host and has the ability to replicate itself. 
• When this replication succeeds, the affected areas are then said to be "infected" with a computer virus.
• A virus operates by inserting or attaching itself to a legitimate program or document that supports macros in order to execute its code.
• In the process, a virus has the potential to cause unexpected or damaging effects, such as harming the system software by corrupting or destroying data.
• Once a virus has successfully attached to a program, file, or document, the virus will lie dormant until circumstances cause the computer or device to execute its code. 

The correct answer is the Insert Tab.

Key Points

• Cover Button can be used to insert a pre-formatted cover page for a document.
• The information that is to appear on the page is filled in after the page is created.
• It is used to fill in the title, author, date, and other information.
• It is present in the Insert tab of MS word.

​

Important Points

Other important tools of Insert Tab

 The correct answer is Electrically Erasable Programmable Read-Only Memory.

Key Points

• EEPROM stands for Electrically Erasable Programmable Read-Only Memory.
• It is a non-volatile memory in which the information stored Is retained even after the power goes off.
• A special type of PROM in which the information stored in it can be erased by exposing it to an electrical charge at one byte at a time. 
• EEPROM generally offers excellent capabilities and performance.
• EEPROMs are constructed as arrays of floating-gate transistors.

All the given number is square of some number – 1 except ‘257’

120 → (11)² – 1

257 → (16)² + 1

440 → (21)² – 1

323 → (18)² – 1