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Civil Engineering :: Elements of Remote Sensing

  1. Snow cover on the earth surface :

  2. A.

    gives the highest reflectance in the visible spectrum

    B.

    shows marked variation in its reflectance characteristics

    C.

    Shows side variation in the grain size

    D.

    All the above

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  3. The emission of electrons from a metal plate exposed to light depends on the :

  4. A.

    intensity of the light

    B.

    frequency of light

    C.

    both (a) and (b)

    D.

    neither (a) nor (b)

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  5. The range measurements in GPS are made with :

  6. A.

    3 L - band frequencies

    B.

    2 L - band frequencies

    C.

    2 C - band frequencies

    D.

    3 C - band frequencies

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  7. A time varying magnetic field produces an electric field'. This phenomenon is known as

  8. A.

    Newton's law

    B.

    Kirchofflaw

    C.

    Ampere Maxwell law

    D.

    Faraday's law

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  9. For obtaining accurate distance of the satellite

  10. A.

    the GPS receiver slides its codes backwards until it synchronises with the satellite signals

    B.

    the signal arrival time is corrected for tropospheric and ionospheric delays

    C.

    the carrier phase measurement technique is adopted

    D.
    All of these

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  11. GPS has been widely recognized as accurate, fast and cost-effective method for the following:

  12. A.

    Collection of the geographic coordinate data used in GIS

    B.

    for movement of navigation

    C.
    For determination of precise orbit and altitude of low earth orbiting satellites
    D.

    All of these

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  13. Electromagnetic waves are characterised by :

  14. A.

    frequency

    B.

    wave length

    C.

    intensity

    D.

    direction of travel and plane of polarisation.

    E.

    All of these

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  15. The solid angle subtended by the sphere is :

  16. A.
    B.

    C.

    D.

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  17. For accurate position fix, the three satellites:

  18. A.

    must be along a common arc

    B.

    must be in vertical line above the receiver

    C.
    must be widely separated and well distributed
    D.

    must be such that one satellite is overhead of the receiver and other two widely separated

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  19. Pick up the correct statement from the following:

  20. 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

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