Civil Engineering MCQs

Page No. 79

In case of reflection and refraction of electromagnetic radiation ?


aAngle of incidence = angle of refraction


bAngle of incidence = angle of reflection


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


d All the above



Pick up the correct statement from the following?


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


b Polarising angle of glass is 57.5°


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


dAll the above


View Answer All the above

sensor IFOV is proportional to_________________?


asin2


bcos2


csec2


dtan2


View Answer sec2

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


aSolar zenith angle


bAzimuth angle


c Look angle


dAll of these


View Answer All of these

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


aConstant in time


bConstant in space


cConstant in time and space


d None of these



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


aCloud evolution


b Vegetative cover


cSnow cover


dAll of these


View Answer All of these

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


aDirectly proportional to the bandwidth


bInversely proportional to the bandwidth


c The square of the bandwidth


d None of these



Formation of snow occurs if the cloud temperature is________________?


aJust above the freezing point


bAt the freezing point


c Below the freezing point


d None of these



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


a40mm


b60mm


c80mm


d100mm


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


bshear force due to 2.5% of the column load


c2.5% of the column loa


dboth (A) and (B)



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