Introduction to Computers For Government Exams

Computer

  1. Computer is a general purpose machine which can be programmed to perform Arithmetic and Logical operations.
  2. The Physical parts of the Computer are known as Hardware.
  3. Programs or Instructions given to the Computer to carry out different tasks are known as Software.

How a Computer works?

Computer accepts inputs or directions from a user and carries out certain instructions based on the programs already written in it and perform a task.

Some Input Devices in Computer

  • Keyboard
  • Mouse
  • Scanner
  • Joystick
  • Web Camera
  • Bar code reader
  • Biometric Scanners
  • Microphones
  • Touch pad

Some Output Devices in Computer

  • Monitor
  • Printer
  • Speakers
  • Head phones
  • Projector

Different Memory types in Computer

  • RAM- Random Access Memory, SRAM- Static RAM, DRAM- Dynamic RAM
  • ROM- Read Only Memory, PROM- Programmable ROM, EPROM- Electrically Programmable ROM, EEPROM- Electrically Erasable PROM
  • Hard Disc- Magnetic Memory
  • Compact Disc(CD)- Optical Memory- External Memory
  • Digital Video Disc (DVD)- Optical Memory- External Memory
  • Blu-Ray Disc (BD)- Optical Memory- External Memory
  • Floppy Disc- Magnetic Memory- External Device
  • Flash Memory (Pen Drive) – EEPROM Technology
  • Micro SD Card (Memory Card) – EEPROM Technology

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