Full IGCSE (0478) | O Level Computer Science (2210) May/June 2024 /11 Paper 1 | Solved paper

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Hi everyone! How's your learning going? I hope you're all practicing past papers. Today, we’ll be discussing another exam—May/June 2024 Paper 1 for Computer Science. It’s a 1-hour 45-minute paper with 75 marks, and you have to answer all the questions using either a dark blue or black pen. If you're drawing, you can use a pencil. Be sure to fill in your name, center number, and candidate number at the top. Avoid using an erasable pen or correction fluid, and make sure you don’t write over any barcodes. Calculators aren’t allowed, so your calculations need to be spot-on.

Let's start with the first question: a student has a portable tablet computer. You need to identify two input devices built into it—think of options like a touchscreen, microphone, webcam, or accelerometer. For the output device, the right answer is something built-in, like a screen or speakers. Next, for storage devices, remember the key phrase "built-in," and your answer should be SSD.

In the next section, you'll work with hexadecimal numbers. You're asked to pick the incorrect statement about the hexadecimal number system. Remember, hexadecimal is base-16, not base-10, so that’s the incorrect statement to choose.

Moving on, you'll be converting decimal numbers to hexadecimal. For example, when converting the number 32, 165, etc., pay attention to binary conversions and nibbles. Don’t worry, if you’ve practiced this, it’ll be easy to get the right answer.

You’ll also be performing logical shifts in binary. For a left shift of three places, the bits will move out, and you’ll need to pad with zeros. Don’t forget that a left shift by two multiplies the binary number by four. For two’s complement, the conversion to denary requires careful placement of values, with the MSB being negative.

In the section on data packets, you'll describe the structure, which includes the header, payload, and trailer. Be sure to mention the IP addresses, sequence numbers, and error-checking methods like CRC. For packet switching, the router decides the path.

When talking about serial transmission, remember it’s chosen for reliability, reduced interference, and ensuring bits arrive in sequence, which is important over long distances.

Lastly, you’ll be asked about secondary storage—its main purpose is permanent storage of data and software. You’ll also need to identify optical storage types. Examples include compact discs, DVDs, and Blu-ray discs. Make sure you don’t confuse them with non-optical storage like SSDs or USB drives.

Got all that? Any questions so far? Great! Let’s move on to the next section.

E e, it’s taking longer than usual, but now we’re done. For question three, the primary storage is your memory. Exactly. What about the SD card? It’s a solid-state drive (SSD), right! The hard disk is your secondary storage—internal secondary, that’s great. For DVD, Blu-ray, and USB drives, those are also SSD technologies. Scoring three out of three is not difficult, right? Now, let’s talk about why a computer needs RAM. RAM stores data and software currently in use, speeding up the fetch-execute cycle.

Moving on to part D, the fetch-decode-execute (FDE) cycle is important. A diagram should show key components like registers, address buses, and how data moves between the PC, RAM, MDR, and CIR. Accurate diagrams and annotations will help you score well.

Firmware, on the other hand, is for permanently storing instructions in ROM. An example would be BIOS or the bootloader. System software examples include the operating system and utility programs.

For asymmetric encryption, plain text is encrypted into ciphertext using a public key. It's decrypted with a private key, so make sure to remember that key distinction. Now, about automation—robots, for example, perform tasks without human intervention. Characteristics of robots include being programmable, having sensors, and some degree of movement.

Finally, in machine learning, robots improve by adapting their processes, becoming more efficient as they learn from their environment.

Hope that clarifies everything!

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IGCSE | O Level Solved Papers - Computer Systems | Algorithms, Programming and Logic

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