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Civil Engineering :: Elements of Remote Sensing

Elements of Remote Sensing - Section 1
Elements of Remote Sensing - Section 2
Elements of Remote Sensing - Section 3
Elements of Remote Sensing - section-4

  1. Pick up the correct statement from the following :

    2. A.

    Frequency is the number of wave crests passing a fixed point in one second
    B.

    Frequency of a wave is measured in Hertz (Hz)
    C.
    Amplitude of a wave is the height of its crust from the mid-point.
    D.
    The square of the amplitude is proportional to the energy transported by the wave.
    E.

    All of these

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  2. If electric permittivity and magnetic permeability of the medium are respectively ε and μ, then the velocity (Cm) of the electromagnetic wave in the medium is given by :
    3. A.

    B.

    C.

    D.

    None of these

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  3. Earth observations from a satellite platform provides :

    4. A.

    synoptic view of a large area
    B.

    constant solar zenith angles and similar illumination conditions.
    C.

    repetitive observations of the same area with intervals of a few minutes to a few weeks
    D.

    All of these

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  4. Due to scan geometery of a satellite sensor:
    5. A.

    the off-nadir resolution is degraded
    B.

    the ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir
    C.

    the details towards the edge of the scan get compressed
    D.

    All of these

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  5. A time varrying electric field produces a magnetic field.' This phenemenon is called:

    6. A.

    Hertz's law
    B.

    Ampere Maxwell's law
    C.

    Faraday's law
    D.

    Kirchoff s law

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  6. Which one of the following quantities forms the basis of radiometery?

    7. A.

    Radiant energy (Q)
    B.
    Radiant flux (φ)
    C.

    Radiant intensity (I)
    D.

    Radiance (L)
    E.

    All of these

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  7. The maximum sun's radiation occurs around:
    8. A.

    0.4 μm wave length
    B.

    0.55 μ wave length
    C.

    0.7 μ wave length
    D.
    None of these

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  8. Pick up the correct statement from the following :

    9. A.

    The minimum frequency of light for which no electrons are emitted, is called threshold frequency.
    B.

    Polarising angle of glass is 57°.5
    C.

    At the polarising angle, the reflected and refracted rays are orthogonal
    D.

    All the above

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  9. Pick up the correct statement from the following:

    10. A.

    The refractive index of a medium varies according to the wavelength of the radiation,
    B.

    The variation of the refractive index with wave length, is called dispersion,
    C.

    The splitting of colours of white light by passing through a prism, is caused due to dispersion.
    D.

    All the these

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  10. Which one of the following attributes is not associated with digital maps

    11. A.

    colour
    B.

    symbology
    C.

    legends
    D.

    south arrow

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