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Civil Engineering Objective Questions { Elements Of Remote Sensing }

43. Electromagnetic radiation :
A. produces a time varying magnetic field and vice versa
B. once generated, remains self-propagating.
C. is capable to travel across space
D. All of these

44. While propagating through homogeneous, isotropic media,
A. directions of both the fields are orthogonal
B. both the fields are at right angles to the direction of propagation.
C. both (a) and (b)
D. niether (a) nor (b)

45. Electromagnetic waves are characterised by :
A. frequency
B. wave length
C. intensity
D. direction of travel and plane of polarisation.

46. Pick up the correct statement from the following :
A. The distance between two successive crests or troughs of a wave, is called, the wave length
B. The wave length is measured in metres and a fraction of a metre
C. The wave length is generally denoted by X.
D. All of these

47. Pick up the correct statement from the following :
A. Frequency is the number of wave crests passing a fixed point in one second
B. Frequency of a wave is measured in Hertz (Hz)
C. Amplitude of a wave is the height of its crust from the mid-point.
D. All of these

48. Electromagnetic spectrum contains :
A. gamma rays (wave length < 10 -10m)
B. ultraviolet rays (wave length < 10 -6m)
C. infrared rays (wave length < 10 4m)
D. All of these

49. Pick up the incorrect statement regarding the optical infrared region of the electromagnetic spectrum from the following
A. visible region, 0.4 g m -0.7 gm
B. short wave infrared region, 0.7 g m - 1.5 gm
C. near infrared region, 1.5 g m -3.0 gm
D. microwave infrared region, 3.0 g m -8.0 gm

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