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S4 ICT Cloud and IoT: Paper 1 Capacity and Latency
S4 ICT Cloud and IoT: Paper 1 Capacity and Latency
This paper starts with cloud storage capacity, covering GB to MB conversion, upload time and address space, then sensor readings, backup copies and latency gaps, before comparing capacities and correcting an answer that stepped by 1000. Every item has an answer and a one-line note.
Direct answers Items 01 to 03 cover capacity and address space, 04 to 06 cover sensor data and backups, 07 to 09 are latency, comparison and volume items, and 10 corrects a wrong answer.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: S4 ICT Cloud Computing and IoT |
| Level | S4 |
02 Questions (10 items)
- FoundationA cloud plan offers 5 GB of storage. How many MB is that, using 1 GB = 1024 MB?
- FoundationA phone uploads a 24 MB photo at 8 MB per second. How many seconds does it take?
- FoundationAn IPv4 address uses 32 bits. How many addresses does the space hold, in powers of two?
- IntermediateAn IoT temperature sensor samples every 15 seconds. How many readings in one hour?
- IntermediateA thousand sensors each send 250 bytes. What is the total in bytes, and roughly in KB (1 KB = 1024 bytes)?
- IntermediateA cloud backup keeps 3 copies of 40 GB each. What is the total size?
- ChallengeA local server answers in 2 ms and a cloud server in 40 ms. What is the difference?
- ChallengeCompare 1 TB (1024 GB) with two 500 GB disks. Which is larger, and by how much?
- ChallengeA device sends 20 readings every second. How many in one hour?
- Error redoA student wrote 256 MB = 256,000 KB. What went wrong, and what is the correct value?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 5120 MB | 5 times 1024 gives 5120, so 5 GB is 5120 MB. |
| 2 | 3 seconds | 24 divided by 8 is 3, so the upload takes 3 seconds. |
| 3 | 2 to the power 32, which is 4,294,967,296 | Each bit doubles the count, so 32 bits give 2 to the power 32 addresses. |
| 4 | 240 readings | 3600 seconds divided by 15 gives 240 readings. |
| 5 | 250,000 bytes, about 244 KB | A thousand times 250 is 250,000 bytes, which is about 244 KB. |
| 6 | 120 GB | 3 times 40 is 120 GB, and copies raise reliability as well as cost. |
| 7 | 38 ms | 40 minus 2 is 38 ms, and that gap matters for real-time apps. |
| 8 | 1 TB is larger, by 24 GB | The two disks add up to 1000 GB, which is 24 GB short of 1024 GB. |
| 9 | 72,000 readings | 20 times 3600 is 72,000 readings in an hour. |
| 10 | He used 1 MB = 1000 KB; the correct value is 262,144 KB | Binary storage steps by 1024, so 256 times 1024 gives 262,144, which is 6144 more. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
S4 ICT cloud and IoT paper 1: ten answered items on capacity conversion, upload time, address space and latency.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.