What is a Light Pen ?

• Light pen is a pointing device which is used to draw directly draw on the screen.
• It is called light pen because it is similar to a pen & senses light.
• It’s an input device in the form of light-sensitive stick used in conjunction with a CRT display.
• The light pen allows the user to point out or draw any object on the screen.
• The user brings the pen to the desired point on screen and presses the pen button to make contact.
• It has a switch on its top which allows the user to make contact with screen.
• It is useful for drawing or graphics in the program such as CAD (computer aided design).
• An engineer, architect or fashion designer can draw directly on screen.
• Used in application such as gaming, graphic arts, healthcare applications etc.
• Light pen cannot scratch or damage a screen.

Advantages of light pen;

• Less expensive than touch screen.
• give the user the full range of mouse capabilities, without the use of a pador any horizontal surface
• Cannot scratch or damage screen.
• Works on any size screen.

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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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Answer ⇒ { B }

 
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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Answer ⇒ { B }

 
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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Answer ⇒ { B }

 
Q : Which of the following is not a hardware processing chip ?
(A) Processing chip
(B) printer
(C) mouse
(D) Java

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Answer ⇒ { B }

 
Q : The monitor of a computer is-
(A) storage device
(B) processing device
(C) input device
(D) output device

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Answer ⇒ { D }

 
Q : Which protocol does Ping use?
(A) TCP
(B) ARP
(C) ICMP
(D) BootP
(E) None of these

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Answer ⇒ { C }

 
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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Answer ⇒ { D }

 
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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Answer ⇒ { A }

 
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 ⇒ ??