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Civil Engineering Objective Questions { Elements Of Remote Sensing }

50. Which one of the following statements is correct ?
A. The ratio of the pet mitivity of a medium and the free space, is called relative permitivity.
B. Dielectric constant is a pure number and has no dimensions.
C. The dielectric constant of pure water is 80.
D. All of these

51. Pick up the correct statement from the following :
A. Permeability is a measure of conducting the magnetic lines of force in the material.
B. Permeability is a measure of the extent to which magnetic lines of force can penetrate a medium.
C. Permeability is expressed as the ratio of the magnetic flux density (B) to the field strength of the magnetizing field.
D. All of these

52. Pick up the correct statement from the following :
A. Electromagnetic wave is composed of electric and magnetic fields
B. Electric and magnetic fields of electromagnetic wave remain mutually orthogonal and transverse to the direction of propagation.
C. If the electromagnetic wave moves in the z-direction, its electric vector remains in the XY plane along-any direction.
D. All of these

53. Pick up the correct statement from the following
A. When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed.
B. When the electric vector is in the plane of incidence, vertical polarisation is formed.
C. When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed. -
D. All of these

54. Pick up the correct statement from the following :
A. Phase of a wave is expressed as a fraction of a period with respect to a refrence
B. Phase is usually specified by angular measure with one period being 360?
C. Superposition of the coherent waves produce interference
D. All of these

55. Pick up the correct statement from the following :
A. The surface defined by the locus of points having same phase, is called a wave front.
B. The wave whose surface of constant phase are parallel planes, is known as a plane wave.
C. The relative phase difference between the waves is important and not the absolute phase of a point on the wave
D. All of these

56. Coherence of two electromagnetic waves takes place if their phase difference is :
A. constant in time
B. constant in space
C. constant in time and space
D. None of these

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