Civil Engineering MCQs

Page No. 78

Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its_______________________?


aSix ground stations

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bFive ground stations

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cFour ground stations

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dThree ground stations

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View Answer Five ground stations

The changes in the reflectivity/emissivity with time, is called ?


aSpectral variation

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bSpatial variation

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cTemporal variation

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dNone of these

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View Answer Temporal variation

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


a Atmospheric window

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bSignature

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c Radiometric error

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dNone of these

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View Answer Signature

The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called________________?


aReflectance

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bReflectance factor

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cAlbedo

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dNone of these

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View Answer Albedo

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


aThese are produced by the motion of electric charge

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bThe oscillation of charged particles sets up changing electric fields

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c The changing electric fields induce the changing magnetic fields in the surrounding medium

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dNone of these

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View Answer None of these

A reduction of nitrogen nutrient in plants_______________?


aAffects leaf colour

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b Reduces pigment concentration

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cIncrease the visible reflectivity

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dAll of these

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View Answer All of these

Which one of the following statements is correct regarding the GPS satellites ?


aThe nominal altitude is about 20,200 km

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bThe inclination of axis satellite is 55°

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cThe satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)

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d All of these

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View Answer All of these

The optical property of a water body depends on ?


aAbsorption by the dissolved material

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bAbsorption by the suspended particulate matter

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cScattering by the suspended particulate matter

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dAll of these

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View Answer All of these

Which one of the following statements regarding remote sensing is correct ?


aThe interaction of the electromagnetic radiation with the target

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bThe emission of electromagnetic radiation from the target

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c Both A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

Which one of the following factors does not affect the scale of the air photographs ?


aFocal length

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b Flying height

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cGround elevation

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dNone of these

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View Answer None of these

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