Questions & Answers Chapter 1 The Computer System
Dear Students, In this post we will discuss The Computer System – Qs & As.
Short answer questions: (2 Marks)
Q – 1 Draw the hierarchy diagram of classification of computers.
Q – 2 What are mobile computers?
Ans.: Mobile computers are very small in size with in-built memory, storage and a touch screen that can carried by users anywhere. For example, Smart Phones, Tablets etc.
Q – 3 What do you mean by PDA and PMP?
PDA stands for Personal Digital Assistants. These are smaller devices in size which allow a user to perform hands-on functions. It is used for communication, sharing, organizer and provides internet connections to the user.
PMP stands for Portable Media player. This kind of device is used for stores media files such as audio, video, images etc. User can use this device for entertainment purposes.
Q – 4 Define hardware.
Ans.: Hardware is the tangible parts of the computer or components attached to the computer system. Ex. Keyboard, Mouse, Mother Board etc.
Q – 5 What is software?
Ans.: Software is a program installed in a computer to perform specific tasks. A software provides an interface to the user and provides a set of commands to fulfil user’s need. For example, MS Word, MS Excel etc.
Long answer questions: (5 Marks)
Q -1 Explain the classification of computers according to size.
Ans.: There are four types of computers according to size:
- Micro Computers
- Mini Computers
- Mainframe Computers
- Super Computers
- Micro Computers: These are very small size computers. They have smaller storage devices and the user can carry with him/her anywhere he wanted to and or placed at one small fixed place. Ex. Mobile computers, Laptops, Smartphones, computers used at homes and offices
- Mini Computers: These typed of computers are bigger than microcomputers. They were introduced in the 1960s but replaced by microcomputers. Ex. CDC 160A, MicroVAX 3100 etc.
- Mainframe Computers: Mainframe computers are bigger than mini computers and consume more space to fix them. They are used for huge data processing and handles millions of files at a time such as government offices, airlines and banks. Ex. IBM 4381, DEC 10 etc.
- Super Computers: They are the biggest and most powerful computers. They required a whole room to fix. They can handle trillions of instructions per second. It is mostly used by large companies to perform metric computations. Ex. PARAM, ANURAG are supercomputers developed by India etc.
Read more about the classification of computers
Q – 2 Explain the types of scanners in detail.
Ans.: There are five types of scanners:
- Optical Character Reader (OCR)
- Magnetic Ink Character Reader (MICR)
- Bar Code Reader (BCR)
- Optical Mark Reader (OMR)
- Smart Card Reader
1. Optical Character Reader (OCR): OCR is used to scan the characters from the printed document or handwritten text. It can read the text as well as images.
2. Magnetic Ink Character Reader: It contains special ink with magnetic particles of iron oxide. It read the characters written by magnetic ink. It mostly used in banks to read and identify cheques.
3. Bar Code Reader (BCR): It is generally found in malls or shops which read the vertical thick and thin lines on any product and take input from the sticker.
4. Optical Mark Reader (OMR): If you have appeared in any olympiad exam then you may familiar with OMR sheet. OMR scanner read that marks done by on OMR sheet.
5. Smart Card Reader: Smart Card readers read the magnetic strips given on smart cards. These devices read the data stored in form of numbers and characters on a magnetic strip. Ex. A debit card or credit card
Q – 3 Explain some output devices in brief.
Ans.: Output device are used to print or display the result on paper or on screen. Some of them are as follows:
1. Printer: Printer is very important output device as we need to print out of almost everything what we are doing in the computer for future use. There are three types of printers available.
- Dot Matrix Printer: Print characters in form of dots
- Inkjet Printer: Used ink to print the characters
- Laser Printer: Used laser light to print the characters
Read complete detail about printers
2. Monitor: Monitor is also another important device for the computer system. As it displays the output on the screen. There are three types of monitors:
- CRT (Cathode Ray Tube)
- LCD (Liquid Crystal Display)
- LED (Light Emitting Diode)
3. Speaker: If want to hear the sound, audio or music then you need to attach speakers to the computer system. These devices generate the output in the air.
Q – 4 What are the types of software? Explain in brief with example.
Ans.: There are two types of software. Let us understand with following hierarchy diagram.
1. System Software: Computers are useless rectangular box without system software. The system software performs the important system functions such as device management, process management, user management etc. There are three types of system software:
A. Operating System: OS provides an interface to the user to perform the system-related functions. It is also responsible for the management of computers various functions and devices.
B. Language Processors: Computer does not understand language of users. So language processor translate the language which computer can understand. There are three types of language processors:
i. Assembler: Convert instructions written in assembly language to machine language.
ii. : Compiler converts a program written high-level language to machine language.
iii. Interpreter: It also converts a program written in a high-level language to machine language
C. Drivers: Drivers are responsible to run the hardware attached to the computer system
2. Application Software: It is used to perform a specific task on the computer. They perform only those task for what they designed and developed. There are three types of application software
A. General Purpose Software: These types of Softwares serves the general purpose like preparing documents, spreadsheets, presentations, playing audio and video, previewing images, reading pdf files etc.
B. Package: They are a set of general-purpose software as a single unit. For example, MS Office, Adobe, Macromedia etc.
C. Utility: Utility software designed to maintain the computer system and work upon a few system functions which do not perform by OS. Ex. Antivirus Software, Data Recovery tools etc.
Q – 5 Differentiate between compiler and interpreter.
| It reads the whole program at once.
|| It reads program line by line
| It displays errors at after checking whole program
|| It displays errors after executing each line
| It creates an object file
|| It does not create any other file
| It is a user-friendly language processor
|| It is system friendly processor
| Programming languages like C, C++ uses compiler
|| Programming languages like java, python uses interpreter
Q – 6 Write a short note on computer languages.
Ans.: Computer systems are is a set of following:
- Hardware: Physical Components
- Software: Programs
- Humanware: Users
All of these have their own language. So to do communication with them computer uses three types languages:
- Machine or Low level language
- Assembly Language
- High level Lanaguage
1. Machine Langauge or level langauge: This is the language which computer understands. It uses only 0s and 1s to represent data in the system. If the program is written in binary codes it performs well in the system as it does not required any language translator.
2. Assembly Language: This language uses few English words on a chip or devices. To read this assembler is used as a translator. It is little bit slow compared to machine language.
3. High level Language: It uses our common English words to write programs along with symbols and numbers. A script written in high level language is known as source program. The program is translated through the compiler or interpreter and then produces the results.