What is the function of a light sensor?

• To generate electricity

• To detect changes in light levels

• To store energy in silicon cells

• To switch on and off different devices

What is another name for a photovoltaic light sensor?

• Solar cells

• Photo-resistors

• Photo diodes

• Proximity sensors

When do photovoltaic sensors not generate current?

• In high light situations

• In low light situations

• In complete darkness

• They always generate current

What happens to the resistance of a light-dependent sensor as light levels increase?

• It increases

• It stays the same

• It decreases

• It fluctuates

What are photoresistors made of?

• Cadmium sulphide

• Silicon

• Photovoltaic cells

• Photo diodes

What digital technology uses photo diodes to detect light levels?

• Cameras

• Video recorders

• Remote controls

• All of the above

What is the function of proximity light sensors?

• To generate current

• To detect motion or proximity to another object

• To transmit different light levels to a device

• To respond to levels of infrared

What is the common use of proximity light sensors in outdoor lights?

• To generate electricity

• To detect changes in light levels

• To respond to levels of infrared

• To detect motion for security purposes

Which type of light sensor works as automatic switches for different devices and belongs to a group called photo-resistors?

• Photovoltaic

• Light Dependent

• Photo Diode

• Proximity

What is the name of the least expensive detector that can be used when building a light sensor?

• Photovoltaic

• Light Dependent

• Photo Diode

• Photoresistor