Question Discussion & Solution

The correct answer is PDF.

Key Points

• Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1993 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
• Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images, and other information needed to display it. 

Additional Information

• DOC is the official document file used in Microsoft Word.
• A DOC file contains text, images, and graphs.
• It can be opened by many different programs and users can change printing options once it's opened.
• A TXT file is a standard text document that contains plain text.

The correct answer is Monitor.

Key Points

• In computing, an input device is a piece of equipment used to provide data and control signals to an information processing system such as a computer or information appliance.
• A 'keyboard' is a human interface device that is represented as a layout of buttons. 

Additional Information

Some input and output devices of computer:

• Input
  • Keyboard
  • Mouse
  • Scanner 
  • Cameras
  • Microphones
• Output 
  • Printer 
  • Monitor
  • Plotter

The correct answer is Second.

Key Points

• Second Generation(1955-1964):
  • The computer made in the second generation was completely based upon transistors.
  • Transistors replaced vacuum tubes in computers.
  • It was invented at Bell Labs by Walter H. Brattain (1902-1987), John Bardeen (1908-1991), and William B. Shockley (1910-1989) in 1947.
  • In the computers of the second generation, punched cards and printouts were used for inputs and outputs.
  • The TX-0 was the first computer that used transistors, It was released in 1956.
  • These second-generation machines were used for a wide variety of business and scientific jobs and used high-level programming and assembly languages such as FORTRAN (Formula Translator) and COBOL (Common Business Oriented Language).
  • The second-generation computers had several features:
    • ​Computers made in the second generation used transistors that made them more reliable, smaller in size, faster in speed, more energy-efficient, and cheaper compared to the first generation of computers.
    • They contain magnetic storage disks and magnetic core memory.
    • They used high-level languages such as FORTRAN and COBOL and allowed communication with the help of a telephone line.
    • As compared to the first generation of computers, the data processing time reduced from milliseconds to microseconds.

Additional Information

• First Generation(1942-1955): 
  • The first-generation computers used vacuum tubes for circuitry and magnetic drums for memory.
  • They were often enormous and taking up the entire room.
  •  First-generation computers relied on machine language.
  • They were very expensive to operate and in addition to using a great deal of electricity, generated a lot of heat, which was often the cause of malfunctions.
  •  The UNIVAC and ENIAC computers are examples of first-generation computing devices.
• Third Generation(1964-1975):
  • ​The development of the integrated circuit was the hallmark of the third generation of computers.
  • Transistors were miniaturized and placed on Silicon chips called semiconductors.
  • Instead of punched cards and printouts, users interacted with third-generation computers through keyboards and monitors and interfaced with an operating system.
  •  It allowed the device to run many different applications at one time.
• Fourth Generation(1971- up to till now):
  • The microprocessor brought the fourth generation of computers, as thousands of integrated circuits were built onto a single silicon chip.
  • The Intel 4004 chip, developed in 1971, located all the components of the computer.
  • From the central processing unit and memory to input/output controls on a single chip.
  • Fourth-generation computers also saw the development of GUIs, the mouse, and handheld devices.

The correct answer is Ctrl + Z.

Key Points

• To undo an action press Ctrl+Z.
• If you prefer your mouse, click Undo on the Quick Access Toolbar.
• You can press Undo (or CTRL+Z) repeatedly if you want to undo multiple steps. 
• Undo means to destroy the effect of something that has already happened.

Additional Information

Important Shortcut keys used in MS Word:

• Cut the selected content to the Clipboard - Ctrl+X
• Copy the selected content to the Clipboard - Ctrl+C
• Paste the contents of the Clipboard -Ctrl+V
• Increase the font size by 1 point.- Ctrl+]
• Center the text - Ctrl+E
• Align the text to the left - Ctrl+L 

The correct answer is Cell address.

Key Points

• A cell reference or cell address is a combination of a column letter and a row number that identifies a cell on a worksheet.  
• For example, A1 refers to the cell at the intersection of column A and row 1, B2 refers to the second cell in column B, and so on.
• It is basically a cell's column number and row number.

Important Points

• In MS Excel, columns are defined with Alphabets like A, B, C....and so on.
• While rows are defined with numerical values like 1, 2, 3, 4,.......and so on.