Sensor based Android interview questions and answers

What can sensors measure?

A) Relative humidity
Pressure
Magnetic field
Steps taken
Proximity
The rate of ratation of the device on x,y,z axes

What is a Physical Sensor?

A) Sensors that pieces of hardware that are physically present on the device. Know as Hardware Sensors.

What are Synthetic sensors?

A) Sensors that are not physicall present on the device. They are derived from one or more sensors

What is Raw?

A) Values directly given by the sensor without any correction logic.

Accelerometers, proximity sensors, light sensors,

133) What is Calibrated?

A) Values from sensors that are corrected by the operating system

134) What is Fused?

A) Sensors that gets values from two or more sensors. These values are combined to one value

135) What is SensorManager?

A) Provides access for your app to the sensors.

136) What is Continuous?

A) That report mode when sensor events are generated at a constant rate defined by the sampling peroid

137) What is On change?

A) That report mode when sensor events are generated only if the measured values have changed since the last known value

138) What is One shot?

A) The report mode when sensors only are triggerd once in the entire duration of the event

139) What is Special Trigger?

A) The report mode when the sensor only is trigged when it’s called on. It listen for an event to fire

What is Wake up sensor?

A) Sensor that will wake the Application Processor (AP). up from its suspended mode to report sensor events

279) What is None wake up sensor?

A) Sensors that doesn’t wake the AP. Instead the sensor event is queued in a FIFO queue

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