Computer Awareness - SPLessons

Chapter 1

Introduction of Computers

Introduction of Computers

A computer is an electronic device. The basic definition of computer is it can follow the instructions given by the user.

  • Characteristics of computer are automatic, speed, accuracy, reliability, memory capability, and versatility.
  • Now-a-days, computer has become an important device as the usage rate of computers day by day is increasing. The system can store the data easily.
  •  In general, computers are used in educational institutions, business, bank, supermarkets, hospitals, government offices, shopping malls, and homes.

 A computer is a collection of hardware and software components. It can receive, process and store the data. Computers can understand only binary code, i.e. 0 and 1. It can convert the given data into digitized data, and process the information.

Characteristics of computers are explained below:

  • Automatic: Computers can work automatically without human involvement. But, the instructions should be given by the user.
  • Speed: Computers can work very fast when compared to the human being. A computer has the capability to perform several operations in a fraction of seconds, and the speed is measured in Mega Hertz (MHz).
  • Accuracy: Computers are very accurate. The result can be wrong only if the data is incorrect or due to human errors. Computers can perform complex calculations and outputs accurate results.
  • Reliability: Reliability is an important factor to be considered while developing systems. Reliability is an ability of the system to perform the operations in a specific period of time under certain conditions. Most systems have 1 % downtime, which means spending time on inoperable state. Usually, 99.9% uptime is unacceptable.
  • Versatility: Versatility means the capability of turning. Computers are versatile machines. These can perform any operation as long as it can be broken down into a series of logical steps.
  • Memory Capability: Computers can store large amount of data or information. The information can be recalled for any number of times depending on the requirement.

Educational Institutions: Computer is a very important tool in educational institutions like schools, and colleges.

  • Now-a-days, education has become very easy with computers. Students can learn new skills easily. It can improve the quality of teaching and student knowledge.
  • Computers are used to train the student for online exams. Now-a-days, many exams are conducted with the online process.
  • In administration department, computers can easily perform the tasks such as entering student details, fee, and library.
  • Business: Computers are very useful in the business field. By using computers, a business man can interact or communicate with clients easily throughout the world.
  • In marketing, stock exchanging, and financial sectors, operations can be performed more quickly and efficiently using computers.
  • Bank: In banks, computers are used to access the customer data quickly. By using computer, transactions can be done easily. Online banking is very useful technology for people who are unable to go to the bank. Now, customers can access information and process transactions through online.
  • Super Markets: In this, computers are used to record the sold goods and store goods information. It is easy to make the bill at the time of purchasing.
  • Hospitals: Computers are used in hospitals as mandatory device. By storing the information in computers, management can easily find out the patient history.
  • Computer is used in making online appointments, payroll admittance and discharge records. Monitoring systems are used to monitor the patient’s pulse, blood pressure and body temperature in intensive care and can alert medical staff about any serious situations.
  • Software is used in hospitals for diagnosis purpose. Systems are used for tests like CT Scan, ECG, and other medical tests.
  • Shopping malls: Computers are used to keep track of sales items, stock and also about staff details. Using computers, the bill value can be easily calculated and will be helpful in credit & debit financial sectors.
  • Home: At home, the computer is a very important device for multi-purpose. Children use it mostly to play the games. It is a source of entertainment. It can also be used for work purpose.
  • By using the Internet, people can watch videos, audios and download the information. People may communicate with their friends through social media all over the world and can share the information.

1. hybrid computer is a_____

  1. A) Combines both analog and digital
    B) Resembles analog computer
    C) Resembles digital computer
    D) All the above
    E) None of these

Ans: A

  1. A Computer sends and receives data in the form of signals_
  2. A) Analog
    B) Digital
    C) Modulated
    D) Demodulated
    E) All the above

Ans: B

  1. Which is considered as input devices?
  2. A) Scanner
    B) Printer
    C) Monitor
    D) All the above
    E) None of these

Ans: A

  1. The smallest unit of information a computer can understand stand and process is known as___.
  2. A) Digit
    B) Kilobyte
    C) Nibble
    D) Bit
    E) Byte

Ans: D

  1. What is the name of the part of a computer, which Co-ordinate all function?
  2. A) ALU
    B) ROM
    C) Mother board
    D) RAM
    E) CU

Ans: C

  1. What are the characteristics of computers?
  2. A) Automatic
    B) Speed
    C) Accuracy
    D) Reliability
    E) All the Above

Ans: E

  1. What is the Accuracy level of a regular computer?
  2. A) 8
    B) 7
    C)12
    D) 9
    E) 0

Ans: B

  1. The Speed of the computer can be measured in _____
  2. A) MHz
    B) Hz
    C) KHz
    D) GHz
    E) None of these

Ans: A

9.Accuracy means_____

  1. A) Correctness
    B) Incorrectness
    C) Visible
    D) Understandable
    E) None of these

Ans: A

  1. What is downtime of the regular system?
  2. A) 19%
    B) 99%
    C) 9%
    D) 1%
    E) 0%

Ans: D