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Home Civil Engineering Elements of Remote Sensing Comments

  • Question
  • In GPS, receivers are used are ;


  • Options
  • A. electronic clocks
  • B. atomic clocks
  • C. quartz clocks
  • D. mechanical clocks

  • Correct Answer
  • quartz clocks 


  • Elements of Remote Sensing problems


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    • 1. If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 2. Electromagnetic spectrum contains :

    • Options
    • A. gamma rays (wave length < 10-10 m)
    • B. ultraviolet rays (wave length < 10-6 m)
    • C. infrared rays (wave length < 10-4 m)
    • D. radio rays (wave length > 1 m)
    • E. All of these
    • Discuss
    • 3. Which one of the following factors does not affect the scale of the air photographs :

    • Options
    • A. focal length
    • B. flying height
    • C. ground elevation
    • D. None of these
    • Discuss
    • 4. Formation of snow occurs if the cloud temperature is

    • Options
    • A. just above the freezing point
    • B. at the freezing point
    • C. below the freezing point
    • D. None of these
    • Discuss
    • 5. The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called:

    • Options
    • A. reflectance
    • B. reflectance factor
    • C. albedo
    • D. none of these
    • Discuss
    • 6. Which one of the following attributes is not associated with digital maps

    • Options
    • A. colour
    • B. symbology
    • C. legends
    • D. south arrow
    • Discuss
    • 7. Which one of the following statement is incorrect regarding the electromagnetic radiation?

    • Options
    • A. These are produced by the motion of electric charge
    • B. The oscillation of charged particles sets up changing electric fields.
    • C. The changing electric fields induce the changing magnetic fields in the surrounding medium.
    • D. None of these
    • Discuss
    • 8. Which one of the following statements is correct?

    • Options
    • A. Each satellite of the GPS system transmits two L band signals.
    • B. The two L band signals are modulated by the Pseudorandom binary codes (PN).
    • C. The GPS receiver reads the specific code of the satellite.
    • D. The PN code determines the time taken by the receiver to reach the receiver which is converted into distance
    • E. All of these
    • Discuss
    • 9. In sun light, water rich in phytoplanktons appears :

    • Options
    • A. red
    • B. green
    • C. brown
    • D. blue
    • Discuss
    • 10. Pick up the correct statement from the following:

    • Options
    • A. Water molecules and salt-ions in the ocean scatter the lower wave length more
    • B. An increase in the back scattering coefficient with shorter wave length gives a deep blue colour for clear oceanic water
    • C. The ratio of the upwelling irradiance just below the surface and downwelling irradiance just above the surface is called reflectance ratio.
    • D. All of these
    • Discuss


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