Civil Engineering MCQs

Page No. 74

Who coined the term, ‘Remote sensing_______________?


a Evelyn L. Pruitt, a geographer


bGaspard Felix Tournachon, a French scientist


c Wilbur Wright, an Italian scientist


dNone of these



A passive sensor uses ________________?


a Sun as the source of energy


bFlash light as a source of energ


c Its own source of energy


dNone of these



The basic requirement of any sensor system is___________________?


a Radiometric resolution


bSpatial resolution


c Spectral resolution


dAll of these


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


bIncreases the contrast of the image but reduces the sharpness


cIncreases both the contrast and sharpness


dReduces the contrast but increases the sharpness



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


aPhysical weathering of rocks


b Chemical weathering of rocks


cBiological weathering of rocks


dAll of these


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/


bCm


cCm1


dNone of these


View Answer Cm

The most widely used antenna in GPS is_______________?


aParabolic antenna


bMicrostrip antenna


cHorn antenna


d Slotted antenna


View Answer Microstrip antenna

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


aColour


bSymbology


cLegends


d South arrow


View Answer South arrow

In GPS, receivers used are___________________?


a Electronic clocks


b Atomic clocks


cQuartz clocks


dMechanical clocks


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


b 230 km


c250 km


d500 km


View Answer 230 km

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