Civil Engineering MCQs

Page No. 76

Consider the following statements regarding the satellite imaging_________________?


aThe satellite orbit is fixed in the inertial space

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bDuring successive across-track imaging, the earth rotates beneath the sensor

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cThe satellite images a skewed area

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dAll of the above

✓


View Answer All of the above

The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from__________________?


a10-10 to 106 m

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b10-8 to 106 m

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c10-10 to 1010 m

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d10-8 to 108 m

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View Answer 10-10 to 106 m

Which one of the following residual biases involves the GPS accuracy ?


aSatellite dependent biases due to uncertainty in the orbital parameters of the satellite

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bReceiver -dependent biases due to clock stability with line

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cSignal propagation biases due to the sphere and troposphere propagation

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dAll the above

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View Answer All the above

Critical angle of electromagnetic radiation takes place if__________________?


aAngle of incidence is equal to angle of refraction

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bAngle of incidence is greater than the angle of refraction

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cAngle of incidence is equal to 90°

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dAngle of refraction is equal to 90°

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Leaf reflectance depends primarily on______________?


aThe pigments

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b Internal cell structur

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cEquivalent water content

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dAll of these

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View Answer All of these

Which one of the following errors is produced by platform characteristics of the sensor ?


a Altitude variation

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bAltitude

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cOrbit drift

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d All of these

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View Answer All of these

If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height___________________?


ah = dp/(B/H)

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b h = (B/H) dp

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c h = dp/(H/B)

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d h = (H/B) dp

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View Answer h = dp/(B/H)

Pick up the correct statement from the following_________________?


aWhen the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed

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bWhen the electric vector is in the plane of incidence, vertical polarisation is formed

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c When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed

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dAll of these

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View Answer All of these

The arrangement of terrain features which provides attributes: the shape, size and texture of objects, 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 Spatial variation

Geodimeter is based on_________________?


aPropagation of modulated light waves

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bPropagation of infrared radiation

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cThe visible light as carrier with frequency of the order of 5 × 1014 Hz

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dHigh frequency radio waves

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