CIE IGCSE COMPUTER SCIENCE: SENSORS EXAM QUESTIONS WITH COMPLETE ANSWERS

CIE IGCSE COMPUTER SCIENCE:
SENSORS EXAM QUESTIONS WITH
COMPLETE ANSWERS
What are the different types of sensors? - Answer
● Light
● Temperature
● Magnetic Field
● Gas
● Pressure
● Moisture
● Humidity
● pH
● Motion

What does a light sensor do? - Answer-● Detects light
● Detect Ambient Light Level (brightness at
current time)
● Similar to our eyes

What are light sensors used for? - Answer-● Street lights : only come on when they
need to
● Security systems: beams of light
● Garage doors
● Mobile phone brightness adjusts to ambient light
● Barcode readers
● Robots to navigate by using light beams

What is a temperature sensor? - Answer-● Measures heat
● Detects changes in heat and therefore
temperature
● Two types of temperature sensors:
contact (need physical contact to measure temp)
non-contact (measures energy radiated off an object)

What are temperature sensors used for? - Answer-● Fridges
● Ovens
● Heating thermostat

What is an infra-red sensor? - Answer-● Infrared used on TV remote controls
● Sensor on the TV detects the waves from the remote
● Infrared Cameras detect heat waves from
people or objects