Skip to main content


What is computer and its related terms?

What is Computer?

The word Computer originally comes from the Latin word “Computare”. Computare means to do a calculation or programmable machine.

Initially, the first mechanical computer was designed by Charles Babbage, so he is also called the father of Computer. But initially, he used punch cards for reading only memory.

Definition of Computer: A computer is an electronics machine/device which takes input through the user (by means of the mouse, keyboard etc.) then process it and gives output/result (through the monitor, printer etc.). It can process both the numeric and arithmetic & logical calculations.

Structural diagram of Computer is as follows:

What are the major components of a Computer?

A computer is mainly divided into three parts which are as follows:

          (a)    Input Device
            (b)    Central Processing Unit
            (c)    Output Device

What do you mean by input devices?

Input Device: Input devices are the platform through which data or information entered into the computer. It is an interface through which the user passes their instructions to the processor. At present we are using many input devices.

Some of the Input devices are appended below:

(a)   Mouse
(b)   Keyboard
(c)   Light pen
(d)   Barcode reader
(e)   Plotter
(f)   Digital camera  

Now, I will explain the entire input device one by one 

What is a mouse?

Mouse: Mouse is an input device who greatly enhanced the efficiency of computing. Through mouse, we can access the system.

Composition of a Mouse

An electronics mouse has two buttons. On the top of the mouse,, it is divided into two portions. Left part named as left click and the right part is called right clicks. In between left and right click, there is a round ball which is called Scroll Bar.

Diagram of a mouse:

What is a keyboard?

Keyboard:  Keyboard is also an input device. Keyboard enables to enter data into a computer or any other device. Computer keyboards are similar to the electric typewriters but they have the additional feature of typing the keys.

Structural diagram of Keyboard:

The keyboard is mainly classified under three types of keys. Which are as follows:
   (a)   Alphanumeric keys
   (b)   Punctuations Keys
   (c)   Special keys

   (a)   Alphanumeric keys: Alphanumeric simply refers to the –
    (1)   Numbers (from 0-9)
    (2)   Letters from A to Z (both upper and lower)
    (3)   Special symbols like@,#, $ etc. comes under it.

Structural Diagram of Alphanumeric Keys is as follows:

   (b)   Punctuations keys: comma, semicolon, full stop and similar types of keys come under this. The diagram  is as follows:

   (c)   Special Keys:  Arrow key, functional keys, Caps lock key and control keys are included in special keys.

What is a Light pen?

A light pen is an input hand-held light emitting device which is used for reading the barcodes. The light pen becomes popular in the 1980s. It is similar to the mouse except that can move the pointer and select the objects on the desktop screen.

It is a light-sensitive detector to select an object on a display screen. We can hold it like a writing pen on the screen for passes the information to Computer. Light pens are mostly used by graphics artists. 


Popular posts from this blog


SUPERLATIVES OF INDIA भारत में उत्त्कृष्ट 
1. Which is the longest bridge in India?
Ans.Bhupen Hazarika Setu

भारत में सबसे लंबा पुल कौनसा है?
उत्तर:भूपेन हज़ारिका सेतु

2. Which is the tallest minaret in India?
Ans.Fateh Burj

भारत में सबसे ऊँची ईमारत कौनसी है?
उत्तर:फतेह बुर्ज

3. Which is the biggest mosque in India?
Ans.Jama Masjid

भारत में सबसे बड़ी मस्जिद कौनसी है?
उत्तर:जामा मस्जिद

4. Which is the largest temple in India?

भारत में सबसे बड़ा मंदिर कौनसा है?

5. Which is the largest sand desert in India?

भारत में सबसे बड़ा मरुस्थल कौनसा है?

6. Which is the longest river in India?

भारत में सबसे लम्बी नदी कौनसी है?

7. Which city of the Uttar Pradesh has the Taj Mahal?

ताजमहल उत्तरप्रदेश के कौनसे शहर में है?

8. Where is Dalhousie Hill Station located in India?
Ans.Himachal Pradesh

डलहौज़ी हिल स्टेशन भारत में कहाँ स्थित है?
उत्तर:हिमाचल प्रदेश

9. Who was the first Indian to win Gold Medal at the O…


INDIA QUIZ WOMEN FIRSTS IN INDIA भारत में महिला सर्वप्रथम  1.First woman doctor of India? Ans.Anandi Gopal Joshi
भारत की पहली महिला चिकित्सक? उत्तर:आनंदी गोपाल जोशी 
2.First woman Merchant Navy Officer of India? Ans.Sonali Banerjee
भारत की पहली महिला मर्चेंट नेवी अफसर? उत्तर:सोनाली बनर्जी 
3.First woman teacher of India? Ans.Savitribai Phule
भारत की पहली महिला अध्यापिका? उत्तर:सावित्रीबाई फूल 
4.First woman President of India? Ans.Mrs.Pratibha Patil
भारत की पहली महिला राष्ट्रपति? उत्तर:श्रीमती प्रतिभा पाटिल 
5.First woman Prime Minister of India? Ans.Mrs.Indira Gandhi
भारत की पहली महिला प्रधानमंत्री? उत्तर:श्रीमती इंदिरा गाँधी 
6.First Indian World No.1 woman's tennis sportsperson(doubles)? Ans.Sania Mirja
'विश्व नंबर एक' पहली भारतीय महिला टेनिस खिलाडी (डबल्स में)? उत्तर:सानिया मिर्जा
7.First Indian No.1 women's badminton player? Ans.Saina Nehwal
पहली भारतीय महिला नंबर एक बैडमिंटन खिलाडी? उत्तर:साइना नेहवाल 
8.First woman Chief Minister of India? Ans.Sucheta Kriplani(Utt…
INDIA QUIZTHE FIRSTS IN INDIAभारत में सर्वप्रथम  1. Who was the first President of India?
Ans.Dr.Rajendra Prasad

भारत का पहला राष्ट्रपति कौन था?
उत्तर:डॉ राजेंद्र प्रसाद

2. Who was the first Prime Minister of India?
Ans.Pt.Jawaharlal Nehru

भारत का पहला प्रधानमंत्री कौन था?
उत्तर:पं.जवाहरलाल नेहरू

3. Who was the first Woman President of India?
Ans.Mrs.Pratibha Patil

भारत की पहली महिला राष्ट्रपति कौन थी?
उत्तर:श्रीमति प्रतिभा पाटिल

4. Who was the first woman Prime Minister of India?
Ans.Mrs.Indira Gandhi

भारत की पहली महिला प्रधानमंत्री कौन थी?
उत्तर:श्रीमति इंदिरा गाँधी

5. Who was the first Vice President of India?

भारत का पहला उपराष्ट्रपति कौन था?

6. Who was the first Deputy Prime Minister of India?
Ans.Sardar Vallabh Bhai Patel

भारत का पहला उप-प्रधानमंत्री कौन था?
उत्तर:सरदार वल्लभभाई पटेल

7. Who was the first Indian Bowler to get a Hat-trick in Test Cricket?
Ans.Harbhajan Singh

टेस्ट क्रिकेट में हैट-ट्रिक पाने वाला पहला भारतीय गेंदबाज़ कौ…