Question

Please answer this urgent ​

Answer 1

21.

• Output on a monitor - Softcopy
• Output on a printer - Hardcopy

22. Input units are used to give information/commands into the system. Output units are used to display the final result/display information to the user.

23. A CPU is used for data processing. It is known as the brain of the computer. It controls the fu‎nctioning of every part of the computer.

24. A memory is used to store information/tasks/commands. This helps in easy access of data for a later time.

25.

• Keyboard - A keyboard consists of letters, characters, numbers, etc used to type information/commands into the system.

• Mouse - A mouse is used to help navigate through the system and select things from it.

26. A pointing device is an input device that helps navigate through the system/turns motor responses into signals that are processed by the system. The most popular pointing device is a mouse.

27. A scanner can be used to input by way of scanning information off of something. It can be used on paper/barco‎des. There are mainly four types of scanners:

• Flat-bed scanners
• Barco‎de scanners
• Drum scanners
• Sheet-fed scanners
• Handheld scanners

28. A light pen is an input device used to point out objects/draw objects on the screen. It is used in accordance with the CRT.

29. Barco‎de readers are used to input when a barco‎de needs to be scanned. These barco‎des usually have stored information in them. Using a barco‎de scanner helps retrieve the information.

30. The control unit monitors the operations of a computer. It controls all the parts of a computer and gives an output after processing the information given by a user.

31. A bit is the smallest storage unit; a yobibyte is the largest storage unit.

• KiloByte
• Megabyte
• Gigabyte
• Terabyte
• Petabyte
• Exabyte
• Zettabyte
• Yottabyte

32. The two types of internal memory are namely RAM [Random Access Memory] and ROM [Read-Only Memory]. A RAM is used when you want immediate information, to edit information, etc. A ROM is used when you want to load applications/store information permanently. The information in a ROM cannot be edited.

33. The internal memory [examples: RAM, ROM] is present within the system and the information stored can be accessed immediately whereas the external memory [examples: USBs, CDs] can be connected externally to the system and are usually used to store data for a long-term.

34. An auxiliary memory can store a large amount of data and acts somewhat like a ROM, to store programs and archived content.

35. A hard disk is used to store content such as videos, files, images, programs, etc. or rather digital content in general.

36. A DVD [Digital Versatile Disk] is used to store digital content. It has a much larger storage capacity when compared to a CD.

37. A magnetic tape is used to record/capture data. Magnetic material is coated on a narrow strip that has poles on either end. During the process of recording the field can swap poles, which alters the tape, enabling playback.