The use of computers basically started in the 20th century. Scientists used it for doing mathematical calculations as computers saved their time which was earlier spent in adding numbers.
"Charles Babbage" is popular as "the father of the computer", as he invented the first mechanical computer.
Types of Devices Used in Computer
There are two types of devices used in a computer:
1.Input devices:
The devices that are used to enter or insert data into the computer are known as input devices.
Some of the input devices are:
There is a special type of input device which is known as 'Pointing device'. It is used to specify a certain position in space Example: joystick, mouse.
2.Output devices:
The devices that receive data from the computer in order to perform a task are known as output devices.
Some of the output devices are:
How to Start a Computer
There are several ways to start a computer, but the most commonly used method is as follows:
How to switch off the computer
Step 1: Click the start button at the bottom left corner on the screen.
Step 2: A list will appear. Now click on shut down button on the bottom right corner.
Step 3: If you have left programs or files open, you will get a message like this:
Now you can do two things:
Recap
Q.1 |
Which of the following is first generation of computer? |
a) | EDSAC |
b) | IBM-1401 |
c) | CDC-1604 |
d) | ICL-2900 |
Q.2 |
If we want to cut all the text, then what should be pressed together? |
a) | CTRL + A |
b) | CTRL + V |
c) | CTRL + X |
d) | CTRL + Z |
Q.3 |
Most PCs give a single beep on boot up to indicate they are ok hardware wise. You boot your PC and don't get a beep. What should you check first? |
a) |
RAM |
b) | Microprocessor |
c) | Hard Disk |
d) | Speaker |
Q.4 |
Which language is directly understood by the computer without translation program? |
a) | Assembly language |
b) | Machine language |
c) | High level language |
d) | None of the given option |
Q.5 |
Where does a computer process the raw information? |
a) |
CPU |
b) | Monitor |
c) | Mouse |
d) | Keyboard |
Q.6 |
Which computer has been designed to be as compact as possible? |
a) | Super computer |
b) | Mainframe |
c) | Mini |
d) | Micro computer |
Q.7 |
Identify the device which does not belong to the particular group: |
a) |
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b) | ![]() |
c) | ![]() |
d) | None of these |
Q.8 |
How many Megabyte's are there in 1 Gigabyte? |
a) | 512 mb |
b) | 1028 mb |
c) | 2048 mb |
d) | 1024 mb |
Q.9 |
To which location our file is stored in a computer? |
a) |
![]() Recycle Bin |
b) | ![]() Control Panel |
c) | ![]() My Computer |
d) | ![]() Clipboard |
Q.10 |
Which one of the following represents the binary equivalent of the decimal number 25? |
a) | 11001 |
b) | 11011 |
c) | 10101 |
d) | 1101 |
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