Civil Engineering MCQs

Page No. 79

In case of reflection and refraction of electromagnetic radiation ?


aAngle of incidence = angle of refraction

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bAngle of incidence = angle of reflection

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cAngle of refraction = sum of the angles of incidence and refraction

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d All the above

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Pick up the correct statement from the following?


aThe minimum frequency of light for which no electrons are emitted, is called threshold frequency

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b Polarising angle of glass is 57.5°

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c At the polarising angle, the reflected and refracted rays are orthogonal

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dAll the above

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View Answer All the above

sensor IFOV is proportional to_________________?


asin2

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bcos2

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csec2

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dtan2

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View Answer sec2

Which one of the following parameters is considered to determine the reflectance of a vegetation canopy ?


aSolar zenith angle

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bAzimuth angle

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c Look angle

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dAll of these

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View Answer All of these

Coherence of two electromagnetic waves takes place if their phase difference is_________________?


aConstant in time

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bConstant in space

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cConstant in time and space

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d None of these

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Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena________________?


aCloud evolution

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b Vegetative cover

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cSnow cover

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dAll of these

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View Answer All of these

The coherence length over which there is a strong relationship between amplitudes is_________________?


aDirectly proportional to the bandwidth

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bInversely proportional to the bandwidth

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c The square of the bandwidth

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d None of these

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Formation of snow occurs if the cloud temperature is________________?


aJust above the freezing point

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bAt the freezing point

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c Below the freezing point

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d None of these

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If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be______________?


a40mm

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b60mm

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c80mm

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d100mm

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View Answer 60mm

Lacing bars in a steel column should be designed to resist_________________?


a bending moment due to 2.5% of the column load

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bshear force due to 2.5% of the column load

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c2.5% of the column loa

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dboth (A) and (B)

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