Grade 9: REVISION- 1.COMPUTER SYSTEM

1.1.1: Differentiate between natural and artificial systems with real-world examples.

1.2.1: Define various input and output devices, including keyboards, touchscreen, pointing devices, biometric scanners, sensors, recognition systems, audio devices, display screens, printers, plotters, cutters, and actuators.
1.2.2: Identify the use of types of sensors, i.e., temperature, moisture, light, infra-red, pressure, sound/acoustic, gas and pH.
1.2.3: Describe primary and secondary storage devices based on location, cost, capacity, access time, data processing method, and storage technology such as semiconductor (SSD), magnetic (HDD), and optical.
1.2.4: Illustrate the Von Neumann Architecture using a block diagram.
1.2.5: Illustrate the system bus and its types, including data bus, address bus and control bus, along with their roles in computer architecture using a diagram.

1.3.1: Distinguish among the memory measuring units such as bits, bytes, kilobytes, megabytes, and gigabytes in computer memory.
1.3.2: Compare the types of primary memory, i.e., Random Access Memory (RAM) and Read Only Memory (ROM).

1.4.1: Differentiate between software engineering and hardware engineering, based on their roles, significance, and applications in computer science.

1.5.1: Compare system software and application software, highlighting their roles in a computer system.
1.5.2: Explain the following types of system software:
- a. operating system
- b. device drivers
- c. utility programs
- d. language processors
1.5.3: Describe the purpose of the following application software:
- a. word processor
- b. spreadsheet
- c. database management
- d. presentation/desktop publication
- e. communication
- f. entertainment
1.5.4: Distinguish between open-source, shareware, and freeware software based on their licensing, accessibility, cost, and usage limitations.

1.6.1: Describe characteristics, significance, and generation of programming languages.
1.6.2: Classify programming languages into low-level (machine and assembly) and high-level (procedural and object-oriented) languages.
1.6.3: Describe the following types of language translators:
- a. compilers
- b. interpreter
- c. assembler

1.7.1: Describe data communication and its components, i.e., sender, message, medium, protocol and receiver.
1.7.2: Describe the modes of network communication, i.e., simplex, half duplex and full duplex.
1.7.3: Differentiate between the synchronous and asynchronous data transmission methods.

1.8.1: Explain the following communication devices:
- a. hub
- b. modem
- c. switch
- d. router
- e. gateway
1.8.2: Explain structure and functionality of network architecture and its types, including client-server, peer-to-peer, and point-to-point.

1.9.1: Explain computer networks and their uses in different fields.
1.9.2: Explain different types of computer networks, i.e., Local Area Network (LAN), Wide Area Network (WAN), and Metropolitan Area Network (MAN), highlighting their characteristics and applications.
1.9.3: Explain guided media and unguided media.
1.9.4: Explain the following network topologies emphasizing their structure, functionality, advantages, and disadvantages:
- a. bus topology
- b. ring topology
- c. tree topology
- d. star topology
- e. mesh topology

1.11.1: Explain the following data communication protocols highlighting their functions and significance:
- a. Transmission Control Protocol/ Internet Protocol (TCP/IP)
- b. Hypertext Transfer Protocol (HTTP)
- c. File Transfer Protocol (FTP)

1.12.1: Explain the purpose and functions of OSI model and its following seven layers:
- a. layer 7 Application layer
- b. layer 6 Presentation layer
- c. layer 5 Session layer
- d. layer 4 Transport layer
- e. layer 3 Network layer
- f. layer 2 Data Link layer
- g. layer 1 Physical layer

1.13.1: Trace the evolution of the internet.
1.13.2: Discuss the advantages and disadvantages of the internet, considering its impact on communication, education and society.

Grade 9