Class 11 Computer Science (SLO Based) Notes 

Unit-1 

"Introduction to Computers"

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1.  Short Response Questions and Answers:


Q31. What is Open source software? Write some examples.

Ans: 

Shareware/trialware:

  • It is available free for a limited time period called a trial period.
  • After the trial period expires user has to purchase the software.
  • The trial version may have limited features or it stops working after it expires.
Examples: antivirus etc.


Q32. What is Freeware? Write some examples.

Ans: 

Freeware:

  • It is available free with full features for unlimited time.
  • It may have some restrictions like personal or educational use.
Examples: Browsers, SKYPE, games, Viber, etc


Q33. What is Firmware? Write some examples.

Ans: 

Firmware:

  • The intermediate form between hardware and software
  • Software embedded in devices during manufacturing.
  • Programs stored in it do not need to be changed.
  • Data is not lost used power is off.
Examples: toys, appliances, ROM, etc.

Q34. What is Internet Application Security?

Ans: 

Internet Application Security:

  • Prevention against threats to internet applications.
  • Threats may include malware attacks, data stealing, modification, or deletion by hackers.
  • Security measures include firewall, anti-virus, spyware removal, and encryption/decryption.

Q35. What is Computer Hardware? 

Ans: 

Computer Hardware:

Physical components that can be seen and touched. It Included input devices, output devices, memory, processing, storage, etc.

Q36. What are input devices? give some examples.

Ans: 

input devices

Input devices provide data and instructions to the computer. It accepts data in human-readable form and converts it into machine-readable form.

Examples: keyboard, mouse, microphone, etc.


Q37. What are the functions of the keyboard?

Ans: 

Keyboard:

  • It is used to input data in the form of text.
  • A keyboard has keys or buttons on it.
  • It converts keys pressed to electric signals in digital form.
  • It has alphabet keys, numeric keys, function keys, and special keys.
  • Pointing Input Devices.
  • Used to control the movement of the cursor on the screen.


Q38. What are the functions of the mouse? Write its types.

Ans: 

Mouse:

  • It is the most common pointing device.
  • It detects motion on a surface and translates it into the motion of the pointer on the screen.
  • Mouse Types: Mechanical mouse (having a ball rolling ), optical mouse (having optical sensors), wireless mouse, etc.
  • It can perform an operation such as selection, moving objects, opening files, etc. by clicking, dragging, etc.


Q39. What are the functions of the trackball?

Ans: 

Trackball:

  • It has a ball on top that is rolled with fingers.
  • It is stationary on the surface.
  • Also has buttons like a mouse performing similar operations.


Q40. What are the functions of the Joystick?

Ans: 

Joystick:

  • It is used for playing games.
  • It has a stick and buttons on it.
  • The movement of objects on the screen is controlled by tilting the stick.

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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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