Civil Engineering MCQs

Page No. 74

Who coined the term, ‘Remote sensing_______________?


a Evelyn L. Pruitt, a geographer

✓


bGaspard Felix Tournachon, a French scientist

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c Wilbur Wright, an Italian scientist

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dNone of these

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A passive sensor uses ________________?


a Sun as the source of energy

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bFlash light as a source of energ

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c Its own source of energy

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dNone of these

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The basic requirement of any sensor system is___________________?


a Radiometric resolution

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bSpatial resolution

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c Spectral resolution

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dAll of these

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View Answer All of these

The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target_________________?


aReduces the contrast of the image and also its sharpness

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bIncreases the contrast of the image but reduces the sharpness

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cIncreases both the contrast and sharpness

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dReduces the contrast but increases the sharpness

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Spatial variation in horizontal and vertical directions is caused due to_________________?


aPhysical weathering of rocks

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b Chemical weathering of rocks

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cBiological weathering of rocks

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dAll of these

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View Answer All of these

If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by___________________?


aCm = 1/

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bCm

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cCm1

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dNone of these

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View Answer Cm

The most widely used antenna in GPS is_______________?


aParabolic antenna

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bMicrostrip antenna

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cHorn antenna

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d Slotted antenna

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View Answer Microstrip antenna

Which one of the following attributes is not associated with digital maps_______________?


aColour

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bSymbology

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cLegends

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d South arrow

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View Answer South arrow

In GPS, receivers used are___________________?


a Electronic clocks

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b Atomic clocks

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cQuartz clocks

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dMechanical clocks

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View Answer Quartz clocks

For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is_____________?


a 130 km

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b 230 km

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c250 km

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d500 km

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View Answer 230 km

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