1. Which is system software?
- Photo document
- Operating system
- Web article
Check the answer and reasoning
Operating system
An operating system manages hardware resources and supports applications.
CS / IGCSE
Software, translators and the internet
Operating systems manage resources and provide services; applications perform user tasks. Compilers and interpreters translate or execute source according to language rules.
Learning objectives
- Explain software, translators and the internet using a concrete example.
- Apply the worked method and justify each step.
- Recognise the limitation described in the final check.
The big idea
Operating systems manage resources and provide services; applications perform user tasks. Compilers and interpreters translate or execute source according to language rules.
The internet is a network of networks; the web is one service using it. DNS resolves names, browsers request resources and protocols define communication rules. Distinguish encryption from merely hiding a URL.
Worked example
Which service maps a domain name to an IP address?
Follow the solution
DNS provides name resolution so a client can locate the addressed service.
Investigate and explain
Predict the worked result before calculating. Change one input, record the new result, and explain which assumptions still hold.
Use the prediction activity below; a local model appears only where it supports this topic.
Check your understanding
2. Which service maps a domain name to an IP address?
- HTML
- A spreadsheet
- DNS
Check the answer and reasoning
DNS
DNS provides name resolution so a client can locate the addressed service.
3. Does HTTPS guarantee that every statement on a site is true?
- No
- Yes
- Only with a padlock
Check the answer and reasoning
No
Transport security protects a connection; it does not establish the factual reliability of the content.