Computer Science (SLO Based) Notes 


Unit-1 

"Introduction to Computers"

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1.  Short Response Questions and Answers:


Q41. What are the functions of the Touch Screen?

Ans: 

Touch Screen:

  • It can be used both as an Input and output device.
  • Pressure-sensitive screen.
  • A user interacts with the computer by touching the icons or text on the screen using fingers or a stylus.
  • Mostly popular in smartphones, PDAs, navigators, tablet PCs, etc.


Q42. What are the functions of the Light Pen?

Ans: 

Light Pen:

  • Similar to a pen having a photo sensor at its tip.
  • It is used for pointing and drawing on the screen.
  • Provides better control and accuracy than a mouse and touch screen.
  • Used for designing and engineering purposes.


Q45. What are the functions of the TouchPad?

Ans: 

Touch Pad:

  • It is a touch-sensitive surface.
  • Sense the movement of fingers and control the pointer movement on the screen Accordingly.
  • Used in laptop computers as an alternative to mouse.
  • Also has two buttons like a mouse below it.



Q46. What are the functions of the Microphone?

Ans: 

Microphone:

  • It is used for voice input.
  • It converts audio signals into electrical signals.
  • A sound card then converts electric signals into digital form.


Q47. What are the functions of the Digital Camera?

Ans: 

Digital Camera:

  • It captures
  •  pictures and stores them in digital form.
  • It has a memory card for storage.
  • The images captured can be downloaded to the computer.
  • Some digital cameras have LCD to view images, and edit or delete them.


Q48. What are the functions of the Scanners? Write its types.

Ans: 

Scanners:

It reads text or images from paper and stores them in a computer in digital form.

Types of scanners:

  • Handheld scanner
  • Flatbed scanner
  • Barcode reader


Q49. What are the functions of the Handheld scanner?

Ans:

Handheld scanner:

  • It is a handheld device that is moved over the image to be scanned.
  • It must be moved with uniform speed to provide image without distortion.
  • They are slower than flatbed scanners.


Q50. What are the functions of the Flatbed scanner?

Ans:

Flatbed scanner:

  • It can scan entire images at a time.
  • The image is placed face down on the glass and covered with a lid.

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Unit-1 (Important Short Q/A)


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(National Book Foundation - As Federal Textbook Board, Islamabad 
Based on National Curriculum Pakistan 2026-2027 and Onward prescribed by Federal Board of Intermediate and Secondary Education, Islamabad, and All Pakistan Boards) 

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