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Civil Engineering :: Elements of Remote Sensing

  1. Which one of the following statement is incorrect regarding the electromagnetic radiation?

  2. 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

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  3. In the given figure the phase of

  4. A.

     Crest A is π/2

    B.

     B crossing is π

    C.

     Trough C is /2

    D.

     All of these

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  5. Which one of the following helps to identify the objects on the earth surface?

  6. A.

     Atmospheric window

    B.

     Signature

    C.

     Radiometric error

    D.

     None of these

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  7. The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:

  8. A.

     Passive remote sensing

    B.

     Active remote sensing

    C.

     Neutral remote sensing

    D.

     None of these

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  9. The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths:

  10. A.

     0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm

    B.

     2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm

    C.

     4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm

    D.

     All of these

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  11. Orbital radius of GPS satellites is approximately:

  12. A.

     15,200 km

    B.

     26,600 km

    C.

     18,400 km

    D.

     36,000 km

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  13. Spatial variation in horizontal and vertical directions is caused due to:

  14. A.

     Physical weathering of rocks

    B.

     Chemical weathering of rocks

    C.

     Biological weathering of rocks

    D.

     All of these

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  15. Which one of the following quantities forms the basis of radiometry?

  16. A.

     Radiant energy (Q)

    B.

     Radiant flux (φ)

    C.

     Radiant intensity (I)

    D.

     All of these

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

  18. A.

     Spectral variation

    B.

     Spatial variation

    C.

     Temporal variation

    D.

     None of these

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  19. Which one of the following statements is correct?

  20. A.

     During the day, earth reflects solar radiation

    B.

     During the day, earth reflects both solar radiations the emission from its surface

    C.

     During the night, earth emits radiation from its surface

    D.

     All of these

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