IGCSE Sensor Quiz (CAIE)

What does a temperature sensor measure?

• Magnetic field changes

• Temperature of the surroundings

• Amount of water vapor in air

• Water levels in soil

Which application is NOT associated with moisture sensors?

• Control moisture in a greenhouse

• Control moisture levels in soil

• Monitor humidity levels in a factory

• Monitor moisture levels in food processing

What do humidity sensors measure?

• Temperature changes

• Magnetic field strength

• Water levels in soil

• Water vapor in air

What is the primary function of light sensors?

• Monitor temperature changes

• Detect sound levels

• Produce an output based on light brightness

• Measure gas pressure

What type of sensor detects broken infrared beams?

• Passive infrared sensor

• Moisture sensor

• Active infrared sensor

• Temperature sensor

Which application uses a passive infrared sensor?

• Detecting rain on a windscreen

• Monitoring humidity in a greenhouse

• Controlling temperature in a chemical process

• Detecting body heat for security

What does a pressure sensor measure?

• Water vapor levels

• Electric current changes

• Pressure applied

• Changes in magnetic fields

What type of sensor is used to detect sound?

• Acoustic/sound sensor

• Humidity sensor

• Light sensor

• Temperature sensor

Which gas is commonly monitored by gas sensors?

• Nitrogen

• Argon

• Oxygen

• Hydrogen

What does a pH sensor measure?

• Magnetic field changes

• Temperature changes

• Acidity levels

• Gas pressure