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Civil Engineering :: Elements of Remote Sensing

  1. Identification of crops is affected by:

  2. A.

    the spectral characteristics of the sensor

    B.

    the spatial characteristics of the sensor

    C.

    the radio metric characteristics of the sensor

    D.

    All of these

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  3. In sun light, water rich in phytoplanktons appears :

  4. A.

    red

    B.

    green

    C.

    brown

    D.

    blue

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  5. The semi-infinite snow albedo is proportional to the square root of the grain radius :

  6. A.

    in the 0.2 to 0.4 μm wave length region

    B.

    in the 0.4 to 0.8 μm wave length region

    C.

    in the 0.8 to 1.2 μm wave length

    D.

    None of these

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  7. Depending upon the nature of the targeted object and the wave length of the electromagnetic radiation incident on it, the radiation gets :

  8. A.

    reflected

    B.

    absorbed

    C.

    re-radiated

    D.

    transmitted through

    E.

    All of these

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  9. Which one of the following statements is correct ?

  10. 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

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  11. "All bodies at temperatures above absolute zero degree emit electromagnetic radiation at different wave length", is known as:

  12. A.

    Plank's law

    B.

    Planktan's law

    C.

    Lambert's cosine law

    D.

    None of these

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  13. Assuming n as the frequency of radiation, n0 as the threshold frequency and k as a constant, the energy of the photo-electrons (E) is related as

  14. A.
    E = k (n - n0)
    B.

    E = k (n + n0)

    C.

    E = k (n x n0)

    D.

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  15. Assuming n as the frequency of radiation, n0 as the threshold frequency and k as a constant, the energy of the photo-electrons (E) is related as

  16. A.
    E = k (n - n0)
    B.

    E = k (n + n0)

    C.

    E = k (n x n0)

    D.

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  17. In which part of the reflective optical infrared region, the effect of multiple leaves in vegetation canopy is maximum ?

  18. A.

    The near-IR (0.7 - 1.3 μm) region

    B.

    The visible (0.4 - 0.7 μm) region

    C.

    The short wave IR (1.3 - 2.7 μm) region

    D.
    In all the above region

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  19. Which one of the following statements is correct ?

  20. A.

    The ratio of the permitivity of a medium and the free space, is called relative permitivity.

    B.

    Dielectric constant is a pure number and has no dimensions.

    C.

    The dielectric constant of pure water is 80.

    D.

    Higher the dielectric constant of a medium, the poorer is its electric conductivity.

    E.

    All of these

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