1. What is Computer
The word “computer” is comes from the word “TO COMPUTE” means to
calculate.
A computer is normally considered to be a calculation device which can
perform the arithmetic operations very speedily.
A computer may be defined as a device which operates upon the data.
Data can be in the form of numbers, letters, symbols, size etc. And it
comes in various shapes & sizes depending upon the type of computer
application.
A computer can store, process & retrieve data as and when we desired.
The fact that computer process data is so fundamental that many people
have started calling as “Data Processor”.
A computer first it gets the Data, does Process on it and then produces
Information.
2. DEFINATION OF COMPUTER
A computer is an electronic device which takes input
from the user, processes it and gives the output as per
user’s requirement.
So the main tasks of performed by the computer are:
Input
Process
Storage
Output
3. How to start a Computer
Step-1:> First switch On the Electric Switch.
Step-2:> Press the start button on the CPU tower.
Step-3:> Wait while the computer boots. When the computer
has finished booting, it will show a dialogue box that will ask
for a user name and password.
Step-4:> Enter your user name and password, then click "OK."
4. How to Shut Down a Computer
Step-1:> To shut down your computer, click "Start" on the
main menu.
Step-2:> Highlight and click on "Shut Down".
Step-3:> You will see a gray dialogue box. Click "Shut Down,"
then click "OK."
Step-4:> Please wait while your computer shuts down.
Step-5:> Switch off your electric board.
5. WRITE DOWN THE CHARACTERISTICS OF
COMPUTER
Some important characteristics of the computer are as follow:
Automatic: স্বয়ংক্রিয়
Computers are automatic machines because it works by itself
without human intervention.
Once it started on a job they carry on until the job is finished.
Computer cannot start themselves.
They can works from the instructions which are stored inside the
system in the form of programs which specify how a particular
job is to be done.
6. Accuracy: সঠিকতা
The accuracy of a computer is very high.
The degree of accuracy of a particular computer
depends upon its design.
Errors can occur by the computer. But these are due
to human weakness, due to incorrect data, but not due
to the technological weakness.
7. Speed:গতি
Computer is a very fact device. It can perform the
amount of work in few seconds for which a human can
take an entire year.
While talking about computer speed we do not talk in
terms of seconds and milliseconds but in microseconds.
A powerful computer is capable of performing several
billion (109) simple arithmetic operations per second.
8. Diligence: অবিচলতা
Unlike human beings, a computer is free from monotony,
tiredness & lack of concentration.
It can continuously work for hours without creating any
error & without grumbling.
If you give ten million calculations to performed, it will
perform with exactly the same accuracy & speed as the
first one.
9. Versatility:বহুমুখিতা
It is one of the most wonderful features about the
computer.
One moment it is preparing the results of a particular
examination, the next moment it is busy with preparing
electricity bills and in between it may be helping an
office secretary to trace an important letter in seconds.
10. Power of remembering:স্মৃতি শক্তি
Computer can store and recall any amount of data because
of its high storage capacity of its storage devices.
Every piece of information can be retained as long as
desired by the user and can be recalled as and when
required.
Even after several years, if the information recalled, it will
be as accurate as on the day when it was filled to the
computers.
11. No I.Q. কোনো বুদ্ধিমত্তা নেই
A computer is not a magical device; it processes no
intelligence of its own.
Its I.Q. is zero
It has to be told what to do & in what sequence.
It cannot take its own decision.
12. No Fallings:কোনো অনুভূতি নেই
A Computer has no feelings because they are
machines.
Based on our feelings, task, knowledge and experience
we often make certain judgments in our day today life.
But Computer goes exactly the way which we have
given the instructions.
