Active and Passive Remote Sensing

Q. Assertion (A): Any device in which the sensor does not use its own source of energy can be called a passive remote sensing device.
Reason (R): Passive remote sensing device can function properly without any dependence on external weather.
Select the correct statement.

1. Both A and R are true, but R is not the correct explanation of A.
2. Both A and R are true, and R is the correct explanation of A.
3. A is true, but R is false.
4. A is false, but R is true.

Q. Which type of sensor emits energy waves of its own to detect objects?

1. Humidity Sensors
2. Particle Sensors
3. Radar Sensors
4. Radiation Sensors

Q. The energy recorded by the sensor has to be _____.

1. Emitted
2. Transmitted
3. None of these
4. Recepted