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Home Civil Engineering Elements of Remote Sensing Comments

  • Question
  • In sun light, water rich in phytoplanktons appears :


  • Options
  • A. red
  • B. green
  • C. brown
  • D. blue

  • Correct Answer
  • green 


  • Elements of Remote Sensing problems


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    • 1. 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
    • 2. 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
    • 3. Which one of the following attributes is not associated with digital maps

    • Options
    • A. colour
    • B. symbology
    • C. legends
    • D. south arrow
    • Discuss
    • 4. In GPS, receivers are used are ;

    • Options
    • A. electronic clocks
    • B. atomic clocks
    • C. quartz clocks
    • D. mechanical clocks
    • Discuss
    • 5. 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
    • 6. 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
    • 7. The semi-infinite snow albedo is proportional to the square root of the grain radius :

    • Options
    • A. in the 0.2 to 0.4 ?m wave length region
    • B. in the 0.4 to 0.8 ?m wave length region
    • C. in the 0.8 to 1.2 ?m wave length
    • D. None of these
    • Discuss
    • 8. For perfect coherent radiation, which one of the following statement is correct?

    • Options
    • A. Both the waves must have single frequencies
    • B. The directions of motion of both waves are parallel.
    • C. The waves must be collimated
    • D. All of these
    • Discuss
    • 9. Snow albedo is affected by :

    • Options
    • A. wave length
    • B. grain size
    • C. solar zenith angle
    • D. snow pack thickness
    • E. All of these
    • Discuss
    • 10. The energy transported by the electromagnetic wave is proportional to :

    • Options
    • A. the altitude of the wave
    • B. the square of the altitude of the wave
    • C. the cube of the altitude of the wave
    • D. the square roof of the amplitude
    • Discuss


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