Full IGCSE Computer Science (0478) October / November 2023 /11 Paper 1 | Solved paper

Hey everyone! Hope you're all enjoying your learning. Today, we’re solving another past paper—Computer Science Paper 1 (0478/111) from October/November 2023. The exam duration is 45 minutes, and you must answer on the question paper. No extra materials are needed. Just a quick reminder of some key instructions: - Answer all questions using a black or dark blue pen. - Use a pencil only for diagrams. - Do not use an erasable pen, correction fluid, or a calculator. - The paper is worth 75 marks, and marks for each question are indicated. - Avoid using brand names in your answers. Now, let’s get started! ### Question 1: Identifying Hardware Devices A student uses a keyboard for schoolwork. What type of device is it? Yes, it's an input device. Similarly, a printer is an output device. Answering these correctly earns you two marks. Easy, right? ### Question 1C: CPU Components The control unit manages the fetch-decode-execute cycle—one mark for this answer. ### Question 1D: Clock Speed A CPU with a clock speed of 2.4 GHz means it completes 2.4 billion cycles per second or 2.4 billion clock pulses per second—this earns two marks. ### Question 1E: Registers in the CPU The Memory Data Register (MDR) stores data that has been fetched or is about to be written to memory—this explanation gets you two marks. Other CPU registers include: - Memory Address Register (MAR) - Program Counter (PC) - Current Instruction Register (CIR) - Accumulator (ACC) Naming three correctly earns three marks. ### Question 2: Binary Representation of Parking Cost A parking machine stores the cost using two 8-bit binary registers. I also explained a past paper in my own words. I started by filling in a table with terms—identifying that hardware refers to the physical components of a computer, application software provides the services users need, the operating system manages files and memory, and firmware is stored in ROM (like BIOS and boot loaders). Then, I moved on to data transmission between a computer and a printer. I clarified that data sent one bit at a time along a single wire means serial transmission, and because the communication is two-way, it’s either serial half duplex or full duplex. I also explained how an odd parity check works: counting the ones in a seven-bit group and adding a parity bit so that the total becomes odd, which helps detect errors. I noted that an echo check is another method where the printer sends back a copy of the data for comparison. Next, I described how a musician records sound on a piano. I detailed that sound is captured with a microphone, sampled into waveforms, and converted into binary values based on the amplitude, with the sample rate and resolution determining accuracy. To improve accuracy, one can increase either the sample rate or resolution. I also compared text conversion systems—explaining that ASCII has a limited number of characters (7 or 8 bits per character) while Unicode supports many more characters (up to 32 bits per character) and even emojis. Then, I drew and annotated a diagram of a firewall, showing how it inspects traffic between a computer and a network, accepting or rejecting data based on set criteria. I also completed statements about data packets, discussing packet headers, destination addresses, and how routers help manage data paths. Lastly, I discussed interrupts. I mentioned that the operating system (or an interrupt handler) manages interrupts, and I explained how a keypress generates an interrupt, which is then processed based on its priority. I also provided examples of hardware interrupts (like a mouse click or printer issues) and software interrupts (such as division by zero or conflicting memory accesses). I wrapped up by encouraging viewers to share the video, subscribe for more updates, and take care of themselves and their loved ones. __________________________________________ 🗨️Comment if you have queries. I will be happy to answer and solve it! _____________________________________________________ 🏆Don't forget to like, share, and subscribe for more tutorials. Happy learning! 🎉 Happy learning! 💻🎓🌟 🙂 Was this video lecture helpful?? share your thoughts and feedback in comments. ______________________________________________________ Playlist Paper 2 🔗https://www.youtube.com/playlist?list=PLjnERwnSrq_pslQi3Lk3Vc7em-gMZTApu _________________________________________ Follow me Facebook:https://web.facebook.com/LearnCSwithSY/ Facebook Community: https://web.facebook.com/groups/learncswithsy Managed by: Digitalmark3ting.com [email protected] +923215255851 #olevelcomputerscience #olevelcomputer #Alevelcomputer #IT #IGCSE #ICT #edexcel #learncomputerscience #edexcelexams #olevelstudents #students