Introduction To Computer VIVA

Q1. Define computer, explain characteristics of a computer.

Computer is an electronic machine that takes data and instructions, processes data according to the given instructions, gives results and stores them.

Characteristics of Computer :

1. Speed 2. Storage 3. Processing 4. Accuracy 5. Recalling

6. Communication 7. Versatile 7. No Feelings 9. No Intelligence

Q2. Explain uses of computer in different fields of life. OR Explain Impacts of Computer Technology on Society.

1. Uses of Computer at Home

2. Uses of Computer in Education

3. Uses of Computer in Industry

4. Uses of Computer in Business

5. Uses of Computer in Medical Field

Q3. Write down a note on types of computer.

Types of Computer

Computers can be divided into the following types on the basis of their working:

1. Analog Computers

Analog computer is used to measure continuous values. It measures a physical property like voltage, pressure, speed and temperature Analog computer is mainly used in the field of engineering and medicine. Examples Analog clock , Speedometer., Thermometer

2. Digital Computers

A digital computer works with digital data. Digital computer uses binary number system. Binary number system consists of only two digits 0 and 1. Today most of the computers used in offices and homes are Digital computers. Examples: Personal Computer-(PC),Digital Score board ,Digital watch

3. Hybrid Computers

A hybrid computer is a combination of both analog and digital computer. Examples:

Hybrid computer devices may calculate patient's heart function, temperature and blood pressure etc. This calculation may be converted into numbers and shown in digital form.
Hybrid computers are also used in spaceships and missile system.

Q4. Differentiate between Analog and Digital Computers

The difference between analog and digital computers is as follows:

Analog Computers		Digital Computers
1	Works on continuous values.	1	Works on discrete values.
2	Low memory.	2	Big memory.
3	Slow speed.	3	Fast speed.

Q5. Write a note on “Classification of Computers”

Classification of Computers

Computers are classified on the basis of size, speed and price as under:

1. Micro Computers

Micro computer is also called personal computer. It was introduced in 1970. It is used by one person at a time. Examples of personal computers are PC and Apple Macintosh.

2. Mini Computers

Mini computers were introduced in the 1960s. Mini computer is larger and more powerful computer than personal computer. Mini computer can serve up to 4000 connected users simultaneously. Examples of mini computers are:

• VAX-8800 • AS 400.

3. Mainframe Computers

Mainframe computers were introduced in 1975. A mainframe computer is a very large computer in size. It is more powerful than mini computer. Examples of mainframe computers are

• NEC 610 • DEC 10

4. Super Computers

Super computers were introduced in 1980s. Super computer is the fastest computer. Super computer is the biggest in size and the most expensive in price than any other computers. Examples of super computers are CRAY-XP, ETA-10, and Deep Blue.

Q9.Explain the basic components/parts of a computer OR Explain the basic computer organization

There are the following main basic parts of the computer:

Input Unit (To enter data and instructions)
Output Unit (To display processing results)
Central Processing Unit( CPU / Processor) (to process data and control operations and components of computer)
Memory Unit (to store data for processing)
Storage Unit (to store large amounts of data permanently)

What are Dual Devices or Both Input/ Output Devices

The devices that can be used to perform both functions -input and output- are called Dual Devices. These devices are also called Dual Purpose Devices or Both Input/Output Devices. With the help of a dual purpose device, we can enter data into computer as well as we can output data from the computer to outside world. For example, Dual devices include: Touch Screen Monitor, Modem, Network Interface Card, Sound card, Hard disk drive, Floppy disk Drive, Magnetic Tape Drive CD-Writer and DVD-Writer etc. These are also called Input/output devices, because they perform both functions. Touch Screen Monitor Dual Devices or Both Input / Output Devices - Touch screens Touch Screen Monitor is an input/output device. It uses a special touch sensitive screen. The User can enter data by touching icons or menus on the screen. As soon as the user selects a command from menu, output is displayed on screen. Commonly touch screen monitors use sensors to detect touch of finger. ...

Explain Different Types Of Data

DATA Data is the collection of raw facts and figures. It is without any proper meaning. Data may be collection of words, numbers, graphics or sounds. What is data? Explain different types of data Examples of Data 1) Student Data on Admission Forms When students get admission in a college. They fill admission form. This form contains raw facts (data of student) like name, father’s name, address of student etc. 2) Data of Citizens During census, data of all citizens is collected. 3) Survey Data Different companies collect data by survey to know the opinion of people about their product. 4) Students Examination data In examination data about obtained marks of different subjects for all students is collected. Different Types Of Data There are following main types of Data. 1) NUMERIC DATA Numeric data consists of 0 to 9 digits, + and – sign and dec...

Using Simple Formulas in Excel With Arithmetic Operators-2

What are Arithmetic Operators in Excel? Arithmetic Operators are used to perform arithmetic operations like addition, subtraction, multiplication and division etc. There are following arithmetic operators in Microsoft Excel: Using Arithmetic / Mathematical Operators in MS Excel Formulas 1. + Operator The + arithmetic operator is used to perform addition of numbers. It is used with in formulas along with Cell References normally. For example, to add the number 10 in A1 cell and the number 20 in B1 cell, we can write a formula =A1+B1 in cell C1. After pressing Enter key we will see the answer 30 in the cell C1. Important Points To Write a Simple Formula in Excel Every formula in Microsoft Excel is started with an Equal sign ( = ). Arithmetic operators (+ for addition, - for subtraction, * for multiplication, / for division) are used. Percentage is calculated by % operator. ( =B2*10% means 10% of the number in cell B2) Pow...

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