What is a Scanner and Its Types
- Scanners are input devices.
- They are capable of entering information directly into the computer.
- The main advantage of direct entry of information is that users do not have to key the information.
- And another advantage is that through Scanners you can input Graphical Data into the computer. This
- Provides faster and more accurate data entry. Important types of scanners Image scanner:
- It’s an input device, which translates paper documents into an electronic format which can stored in a computer.
- The input document may be typed text, pictures, graphics or even handwritten material.
There are two types of image scanner:
Flatbed scanner –
- It’s like a zerox machine which consist of box having a glass plate on its top and a lid to covers the glass plate.
- The document placed inside the glass plate & light source is situated blow glass plate which moves horizontally from left to write & scanning document line by line.
Handheld scanner –
- It contains a set of light emitting diodes encased in small case which can be conveniently held in hand.
- To scan a document the scanner is slowly dragged on the document.
- The scanner has to be dragged carefully & steadily otherwise the document cannot scan properly.
- Used when higher accuracy is not required.
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Basic Computer Questions
Q : The main system board of the computer is called ____.
(A) Motherboard
(B) Processor
(C) Microchip
(D) None of these
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Q : Which of the following system components is the brain of a computer?
(A) Circuit board
(B) CPU
(C) Memory
(D) Network card
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Q : What is the built-in permanent memory in a computer called?
(A) RAM
(B) ROM
(C) CPU
(D) CD-ROM
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Q : Which of the following is the full form of NTFS?
(A) New Tree File system
(B) New Technology file system
(C) New Table file system
(D) Both B and C
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Q : Which of the following is not a hardware processing chip ?
(A) Processing chip
(B) printer
(C) mouse
(D) Java
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Q : The monitor of a computer is-
(A) storage device
(B) processing device
(C) input device
(D) output device
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Q : Which protocol does Ping use?
(A) TCP
(B) ARP
(C) ICMP
(D) BootP
(E) None of these
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Q : If you wish to extend the length of the network without having the signal degrade, you would use a ___.
(A) Gateway
(B) Router
(C) Modem
(D) Repeater
(E) Resonator
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Q : A series of instructions that tells a computer what to do and how to do it is called a ______.
(A) program
(B) command
(C) user response
(D) processor
(E) None of these
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Q : Verification of a login name and password is known as_____.
(A) Configuration
(B) Accessibility
(C) Authentication
(D) logging in
(E) None of these
Answer ⇒ ??