Allied & ICAR Exam Bank • ALLIED_2964 MCQ • 1 Mark

Section 2: Farm Machinery

Farm Machinery

Subtopic: Equipment for precision agriculture

Question Statement:

GreenSeeker and Crop Circle optical sensors used for real-time variable rate nitrogen top-dressing emit their own light, making them:

Options:

  • (A) Active optical sensors capable of operating independently of ambient sunlight or cloud cover
  • (B) Passive sensors requiring direct noon sunlight
  • (C) Thermal cameras
  • (D) Ultrasonic sounders

Answer Key:

A

Step-by-Step Solution & Explanation

Active sensors use modulated LED/laser emitters and tuned photodiodes that reject ambient solar irradiance variations.
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