The following are types of keys on a computer key board except 1

Here are the solutions to the computer science questions:

Multiple Choice Questions:

4) The following are types of keys on a computer key board except 1
All listed options (Alphabetic keys, Numeric keys, Function keys, Symbol keys) are generally considered types of keys found on a computer keyboard. However, if forced to choose an exception based on common classifications, "Symbol keys" are often produced by combining other keys (e.g., Shift + number) or are integrated throughout the main typing area, rather than forming a distinct, dedicated block like Function keys or a numeric keypad.

• D. Symbol keys

5) _______ is an example of a printer that prints by spraying ink on a paper to produce characters.

• B. Inkjet printer

6) Two types of displays that have been used in computer output technology are _______ and _______.

• A. Cathode ray tubes and flat display panel monitors

7) Below are types of ROM except one

• B. ZROM (EROM, PROM, and MROM are recognized types of Read-Only Memory).

8) _______ is the main screen you see when you turn on your computer

• A. Desktop

9) A control which is used to view hidden parts of a window is called

• A. The scroll bar

10) Which of the following are properties of a computer that can be verified in the "This PC" window
The "This PC" properties (or System Information) typically displays the processor type and speed, and the installed RAM size. Manufacturer information can also be found there, making this the most comprehensive correct option.

• A. The manufacturer, the RAM sizes and the processor type and speed

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SECTION B: 2 marks each

8) What is a computer
A computer is an electronic device that processes, stores, and retrieves data according to programmed instructions.

9) State two characteristics of a computer

• Speed: Computers can perform calculations and process data at extremely high speeds.
• Accuracy: Computers perform tasks with high precision and consistency, making very few errors if programmed correctly.

10) State two types of micro computers

• Desktop computers: Personal computers designed for use at a fixed location.
• Laptop computers: Portable computers that integrate all components into a single, mobile unit.

11) How can we classify computers based on the operations of the computer
Computers can be classified based on their operational principles into:

• Analog computers: Process continuous data, representing physical quantities.
• **Digital computers: Process discrete data, represented in binary form (0s and 1s).
• Hybrid computers: Combine features of both analog and digital computers.

12) What do you understand by ROM and RAM in a computer

• ROM (Read-Only Memory): Non-volatile memory that stores permanent instructions (like BIOS/UEFI) needed for the computer to start up. Its contents are not lost when power is off.
• RAM (Random Access Memory): Volatile memory used for temporary storage of data and programs currently in use by the CPU. Its contents are lost when the computer is turned off.

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SECTION D: Essay

Briefly outline the anatomy of the computer and elaborate on the function of each unit with examples

The anatomy of a computer system primarily consists of hardware components organized into functional units:

1. Input Unit:

   • Function: Allows users to enter data and instructions into the computer. It converts human-readable data into a machine-readable format.
   • Examples: A keyboard is used to type text, a mouse for pointing and clicking, and a microphone for audio input.

2. Central Processing Unit (CPU):

   • Function: The "brain" of the computer, responsible for executing instructions, performing calculations, and controlling the overall operation. It comprises the Arithmetic Logic Unit (ALU) for calculations and the Control Unit (CU) for managing operations.
   • Example: When you open a web browser, the CPU fetches and executes the program's instructions to display the application.

3. Memory Unit:

   • Function: Stores data and instructions for processing.
   • Primary Memory (Main Memory): Directly accessible by the CPU.
     • RAM (Random Access Memory): Volatile, temporary storage for active programs and data. Example: A document you are currently editing is held in RAM.
     • ROM (Read-Only Memory): Non-volatile, stores essential startup instructions (firmware). Example: The BIOS/UEFI program that initializes your computer is stored in ROM.
   • Secondary Memory (Auxiliary Storage): Non-volatile, long-term storage for large amounts of data and programs.
     • Examples: A Hard Disk Drive (HDD) or Solid State Drive (SSD) stores your operating system, applications, and files permanently.

4. Output Unit:

   • Function: Presents processed data (information) from the computer to the user in a human-readable format.
   • Examples: A monitor displays visual information, a printer produces hard copies of documents, and speakers provide audio output.