Civil Engineering MCQs

Page No. 73

Remote sensing techniques make use of the properties of ______________ emitted, reflected or diffracted by the sensed objects?


a Electric waves


bSound waves


cElectromagnetic waves


dWind waves


View Answer Electromagnetic waves

The altitudinal distance of a geostationary satellite from the earth is about_________________?


a26,000 km


b30,000 km


c 36,000 km


d44,000 km


View Answer 36,000 km

Due to scan geometry of a satellite sensor____________________?


aThe off-nadir resolution is degraded


bThe ground distance swept by the senor, IFOV is proportional to sec2 of scan measured from the nadir


cThe details towards the edge of the scan get compressed


dAll of these


View Answer All of these

Which one of the following parameters is accurate for DGPS ?


a Positional accuracies ~ 1 – 2 m if rover is less than 1-2 km from the reference station


bPositional accuracies ~ 2 – 5m if rover is less than 2-5 fm from the reference station


cPositional accuracies ~ 5 – 10 m if rover is less than 5-10 km from reference station


dPositional accuracies ~ 5 – 10 m if rover is less than 25 km



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____________________?


aPassive remote sensing


bActive remote sensing


cNeutral remote sensing


dNone of these


View Answer Active remote sensing

The refractive index of the ocean water_______________?


aIncreases with salinity


b Increases with temperature


cDecreases with salinity


dDecreases with temperature



The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as__________________?


aOzone hole


b Atmospheric window


c Ozone window


dBlack hole


View Answer Atmospheric window

The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called________________?


aSensors


b Passive sensors


cActive sensors


dNone of these


View Answer Active sensors

Orbital radius of GPS satellites is approximately ___________________?


a15,200 km


b26,600 km


c18,400 km


d 36,000 km


View Answer 26,600 km

“An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media”. This phenomenon is known as___________________?


aFresnel reflection


bFresnel refraction


cSnell’s law


dNone of these


View Answer Fresnel reflection

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