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Home Civil Engineering Elements of Remote Sensing Comments

  • Question
  • Pick up the correct statement from the following :


  • Options
  • A. The distance between two successive crests or troughs of a wave, is called, the wave length
  • B. The wave length is measured in metres and a fraction of a metre
  • C. The wave length is generally denoted by ?
  • D. The length of the crest from the mid point, is called amplitude
  • E. All of these

  • Correct Answer
  • All of these 


  • Elements of Remote Sensing problems


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    • 1. The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths :

    • Options
    • A. 0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 ?m
    • B. 2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 ?m
    • C. 4.2 to 5.0, 7.0 to 15.0 ?m and 1 cm to 30 cm
    • D. All of these
    • Discuss
    • 2. A reduction of nitrogen nutrient in plants :

    • Options
    • A. affects leaf colour
    • B. reduces pigment concentration
    • C. increase the visible reflectivity
    • D. All of these
    • Discuss
    • 3. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called :

    • Options
    • A. sensonrs
    • B. passive sensors
    • C. active sensors
    • D. None of these
    • Discuss
    • 4. Coherence of two electromagnetic waves takes place if their phase difference is :

    • Options
    • A. constant in time
    • B. constant in space
    • C. constant in time and space
    • D. None of these
    • Discuss
    • 5. Which one of the following relationship between the wave length (?), and frequency and the speed (C) of the electromagnetic wave is correct?

    • Options
    • A. C = v + ?
    • B.
    • C. C = v?
    • D.
    • Discuss
    • 6. Pick up the important characteristic of a target which facilitates its identification from the following:

    • Options
    • A. spectral variation
    • B. spatial variation
    • C. temporal variation
    • D. polarisation variation
    • E. All of these
    • Discuss
    • 7. The basic requirement of any sensor system, is :

    • Options
    • A. radiometric resolution
    • B. spatial resolution
    • C. spectral resolution
    • D. temporal resolution
    • E. All of these
    • Discuss
    • 8. Which one of the following parameters is accurate for DGPS.

    • Options
    • A. Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
    • B. Positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station
    • C. Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
    • D. Positional accuracies ~ 5 - 10 m if rover is less than 25 km
    • Discuss
    • 9. The various stages occuring in GPS system are described below :
      1. Generation of an output to the user
      2. Detection of the GPS signal
      3. Processing the data in the built-in-computer
      4. Decoding the GPS signal.
      The correct sequence of the stages is :

    • Options
    • A. 1, 2, 3, 4
    • B. 2, 3, 4, 1
    • C. 2, 4, 3, 1
    • D. 3, 1, 2 , 4
    • Discuss
    • 10. Which one of the following statements is correct?

    • Options
    • A. Snow albedo falls at all wave length with the increase of grain size
    • B. The effect of grain size on reflection is maximum in the near-IR region
    • C. The effect of grain size on reflection is low in the visible region of the spectrum
    • D. All of these
    • Discuss


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