Question Discussion & Solution

The correct answer is Backspace.

Key Points

• The backspace key is used to delete a word or a line.
• Backspace is the keyboard key that originally pushed the typewriter carriage one position backwards, and in modern computer systems moves the display cursor one position backwards.
• It deletes the character at that position, and shifts back the text after that position by one position.

Additional Information

• The Alt key on a computer keyboard is used to change (alternate) the function of other pressed keys.
• Thus, the Alt key is a modifier key, used in a similar fashion to the Shift key. 
• The shift key is a modifier key on a keyboard, used to type capital letters and another alternate "upper" characters. 
• The Insert key insert (often abbreviated Ins) is a key commonly found on computer keyboards. 

The correct answer is Monitor.

Key Points

• A computer monitor is an output device that displays information in pictorial form.

Additional Information

• Plotter - A plotter is a printer that interprets commands from a computer to make line drawings on paper with one or more automated pens.
• Scanner - A scanner is an input device.
• Printer - It is an output device.

The correct answer is Ctrl+N.

Key Points

• Ctrl+N is the shortcut key used to open a New Document in the MS office.
• In the new document new worksheet is opened in the same window. 

Additional Information

• Some important shortcuts used in MS Excel:
  • Ctrl + O Open an existing workbook.
  • Ctrl + S Save the active workbook.
  • F12 Save the active workbook under a new name, displays the Save as dialog box.
  • Ctrl + W Close the active workbook.
  • Ctrl + C Copy the contents of the selected cells to Clipboard.
  • Ctrl + X Cut the contents of the selected cells to Clipboard.
  • Ctrl + V Insert the contents of the Clipboard into the selected cell(s).

The correct answer is ROM.

Key Points

• Each memory cell of a ROM chip has either a transistor for a 1 bit or none for a 0 bit.
• ROMs(Read-only memory) is used for programs that are essential parts of a computer’s operation, such as the bootstrap program that starts a computer and loads its operating system or the BIOS (basic input/output system) that addresses external devices in a personal computer (PC). 
• EPROM (erasable programmable ROM), EAROM (electrically alterable ROM), and flash memory are types of nonvolatile memories that are rewritable, though the rewriting is far more time-consuming than reading.
• They are thus used as special-purpose memories where writing is seldom necessary—if used for the BIOS, for example, they may be changed to correct errors or update features.

Additional Information

• Cache memory:
  • Cache memory, also called Cache, a supplementary memory system that temporarily stores frequently used instructions and data for quicker processing by the central processor of a computer.
  • The cache augments and is an extension of, a computer’s main memory.
  • Both main memory and cache are internal, random-access memories (RAMs) that use semiconductor-based transistor circuits.
  • The cache holds a copy of only the most frequently used information or program codes stored in the main memory; the smaller capacity of the cache reduces the time required to locate data within it and provide it to the computer for processing. 
• RAM:
  • RAM, in full random-access memory, Computer main memory in which specific contents can be accessed (read or written) directly by the CPU in a very short time regardless of the sequence (and hence location) in which they were recorded.
  • Two types of memory are possible with random-access circuits, static RAM (SRAM) and dynamic RAM (DRAM).
  • A single memory chip is made up of several million memory cells.
  • In an SRAM chip, each memory cell stores a binary digit (1 or 0) for as long as power is supplied.
  • In a DRAM chip, the charge on individual memory cells must be refreshed periodically in order to retain data.
  • Because it has fewer components, DRAM requires less chip area than SRAM; hence a DRAM chip can hold more memory, though its access time is slower.

The correct answer is Simple Mail Transfer Protocol (SMTP).

Key Points

• A network protocol is a set of rules that determine how data is transmitted between different devices in the same network.
• Simple Mail Transfer Protocol (SMTP) is an internet protocol that helps to send email between servers on the internet.
• SMTP is used as a message transfer agent.
• SMTP is an application layer protocol.
• It is always working on listening mode.
• It provides a set of codes that simplify the communication of email messages between email servers.
• The message can move in steps from one computer to its destination using the “store and forward” feature
• The Post Office Protocol (POP) is an Internet Protocol used by e-mail clients to retrieve e-mail from a mail server.

Additional Information 

• The examples of important internet protocols are:
  • HTTPS.
  • File Transfer Protocol.
  • Address Resolution Protocol.
  • Wireless Application Protocol.
  • POP3.
• Hypertext Transfer Protocol (HTTP) is the foundation of data communication for the world wide web.
  • It is a stateless protocol.
• Border Gateway Protocol (BGP) is a protocol designed to exchange routing and reachability information between autonomous systems (AS) on the Internet.
• Real-Time Protocol (RTP) is a protocol designed to handle real-time traffic (like audio and video) of the Internet.