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Civil Engineering :: Elements of Remote Sensing

  1. Which one of the following statements is correct ?

  2. 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

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  3. The refractive index of the ocean water:

  4. A.

    increases with salinity

    B.

    increases with temperature

    C.
    decreases with salinity
    D.

    decreases with temperature

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  5. The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called :

  6. A.

    spectral variation

    B.
    spatial variation
    C.

    temporal variation

    D.

    None of these .

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  7. Electromagnetic radiation :

  8. A.

    produces a time varying magnetic field and vice versa

    B.

    once generated, remains self-propagat-ing.

    C.

    is capable to travel across space

    D.

    consists of magnetic and electric fields

    E.

    All of these

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  9. Pick up the important characteristic of a target which facilitates its identification from the following:

  10. A.

    spectral variation

    B.
    spatial variation
    C.

    temporal variation

    D.
    polarisation variation
    E.

    All of these

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  11. Which one of the following frequency regions is a part of sun's radiation?

  12. A.

    Ultraviolet frequency region

    B.

    Visible frequency region

    C.

    Infrared frequency region

    D.

    Radio frequency region

    E.
    All of these

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  13. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called :

  14. A.

    sensonrs

    B.

    passive sensors

    C.
    active sensors
    D.

    None of these

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  15. Due to pertubation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

  16. A.

    six ground stations

    B.

    five ground stations

    C.

    our ground stations

    D.

    three ground stations

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  17. Coherence of two electromagnetic waves takes place if their phase difference is :

  18. A.

    constant in time

    B.

    constant in space

    C.

    constant in time and space

    D.

    None of these

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  19. The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

  20. 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

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