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Question

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.

A
Both A and R are true, and R is the correct explanation of A.
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B
Both A and R are true, but R is not the correct explanation of A.
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C
A is true, but R is false.
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D
A is false, but R is true.
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Solution

The correct option is C A is true, but R is false.
Passive sensors gather radiation that is emitted or reflected by the object or surrounding areas. Reflected sunlight is the most common source of radiation measured by passive sensors. Examples of passive remote sensors include film photography, infrared, charge-coupled devices, and radiometers. Thus the sensor device cannot work independently but require good sunlight source for better results.

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