ICT is used to control and monitor activities. Which of the following activities are most likely to use sensors?

Statements 2 and 3 are correct: a burglar alarm and automatic doors both rely on sensors to detect movement or presence.

Statement 1 is wrong because designing a master slide for a presentation is a software layout task with no sensor.

Statement 4 is wrong because creating a spreadsheet is data entry that needs no sensor.

A burglar alarm uses motion or contact sensors to detect an intruder and trigger the alert.

Automatic doors use infrared or pressure sensors to detect an approaching person.

Sensors convert a physical quantity such as light, heat or motion into a signal a computer can process.