Chapter#1 (Introduction To Computer)

Question 1

What is a computer?

Answer 1

Computer is an electronic machine used to solve different problems according to set of instructions given to it.

Question 2

What does a computer do?

Answer 2

A computer can accept data, process data into useful information and store it for later use.

Question 3

What does the word “computer” mean?

Answer 3

The word computer is derived from “compute” which Means to calculate.

Question 4

What can computer be used for?

Answer 4

Computer can be used as a calculating machine to produce results at a very high speed. Computer can be used for different purposes. People use computers to solve different problems quickly and easily.

Question 5

How many important characteristics of computer are there?

Answer 5

There are eight important characteristics.

Question 6

Names of important characteristics of a computer :

Answer 6

1. Speed
2. Reliability
3. Storage
4. Processing
5. Accuracy
6. Consistency
7. Communication
8. Versatile
   (RAPVSSCC) Short form

Question 7

Which ways can computer be used in commerce?

Answer 7

Computer can be used in commerce in the following ways:

1. Marketing
2. Stock Exchange
3. Banks
4. Departmental Store
5. Office Automation

Question 8

Use of computers in marketing:

Answer 8

A business organization can use computers for marketing their products. Computer can be used to manage distribution system, advertising and selling activities.

Question 9

Use of computer in stock exchange:

Answer 9

Many stock exchanges use computers to conduct bids.
Stock brokers can perform many trading activities electronically.
It reduces cost as no paper or special building is required to conduct these activities.

Question 10

Use of computer in banks:

Answer 10

1. Saves time and provides convenience for customers.
2. Cash can be withdrawn directly from ATM.
3. Different items on the internet can be purchased through credit cards provided by banks.
4. Banks use computers to maintain customer accounts.

Question 11

Uses of computer in departmental store:

Answer 11

1. It’s use has made business activities fast and accurate.

2. Sales data can be entered in the computer by using bar code reader.

Question 12

What are the uses of barcode reader?

Answer 12

The barcode contains the price of a particular item. The computer uses this input to calculate bills. The record of sale is stored in a computer. This record can be used to analyze accounts and stock inventory.

Question 13

Uses of computer in office Automation:

Answer 13

Many tasks are performed in an office like decision making, data manipulation, document handling and communication etc. Many computer technologies are used to perform these activities easily.

Question 14

What is office Automation?

Answer 14

Office Automation is the process of automating office tasks using computers.

Question 15

What are the types of computers?

Answer 15

There are three types of computers :

1. Analog computers
2. Digital computers
3. Hybrid computers

Question 16

What are analog computers?

Answer 16

1. Recognizes data as a continuous measurement of physical property (e.g. Voltage, pressure speed)
2. Does not operate on digital signals
3. Low memory & fewer functions
4. Difficult to operate & use
5. Built for specifial purposes

Question 17

Where are analog computers used?

Answer 17

They are mostly used in engineering and medicine.

Question 18

Examples of analog computers:

Answer 18

1. Speedometer is used to measure speed of car.
2. Analog clock measures time by distance traveled by hands of clock around a dial.
3. Thermometer is an analog device that measures the length of mercury column

Question 19

What are digital computers?

Answer 19

1. A digital computer processes data in numerical form using digital circuits.
2. Performs arithmetic and logic operations with discrete values (0 & 1)
3. Everything is described in two states of ON and OFF
4. 1 represents ON and 0 represents OFF
5. Very fast computers
6. They come in a variety of sizes, speed and capacities.

Question 20

Where are digital computers used?

Answer 20

They’re commonly used at homes and in offices etc.

Question 21

What are the two important digital computers?

Answer 21

Apple Macintosh and IBM PC

Question 22

Examples of digital comouters:

Answer 22

1. Digital watch (because it changes from one discrete value to the other)
2. Digital scoreboard directly counts discrete values such as the time left to play and the score of each team.