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  • Question
  • The most widely used antenna in GPS is


  • Options
  • A. Parabolid antenna
  • B. Microstrip antenna
  • C. Horn antenna
  • D. Slotted antenna

  • Correct Answer
  • Microstrip antenna 


  • Elements of Remote Sensing problems


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    • 1. Pick up the correct statement from the following :

    • Options
    • A. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
    • B. Topological characteristics of an object are independent of scale measurement
    • C. The three elements of topology are adjacency, containment, and connectivity
    • D. All of these
    • Discuss
    • 2. Pick up the correct statement from the following:

    • Options
    • A. Phase of a wave is expressed as a fraction of a period with respect to a refrence
    • B. Phase is usually specified by angular measure with one period being 360°
    • C. The reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction.
    • D. All of these
    • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. Which one of the following statements is correct?

    • Options
    • A. During the day, earth reflects solar radiation
    • B. During the day earth reflects both solar radiation the emission from its surface
    • C. During the night, earth emits radiation from its surface
    • D. All of these
    • Discuss
    • 7. "An Electromagnetic wave falls on to a boundary between two loss less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as :

    • Options
    • A. Fresnel reflection
    • B. Fresnel refraction
    • C. Snell's law
    • D. None of these
    • Discuss
    • 8. The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

    • Options
    • A. reduces the contrast of the image and also its sharpness
    • B. increases the contrast of the image but reduces the sharpness
    • C. increases both the contrast and sharpness
    • D. reduces the contrast but increases the sharpness
    • Discuss
    • 9. Which one of the following helps to identify the objects on the earth surface?

    • Options
    • A. atmospheric window
    • B. signature
    • C. radiometric error
    • D. None of these
    • Discuss
    • 10. Pick up the correct statement from the following:

    • Options
    • A. The surface defined by the locus of points having same phase, is called a wave front.
    • B. The wave whose surface of constant phase are parallel planes, is known as a plane wave.
    • C. The relative phase difference between the waves is important and not the absolute phase of a point on the wave
    • D. All of these
    • Discuss


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