

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
51. |
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 |
A. | h = dp/(b/h) |
B. | h = (b/h) dp |
C. | h = dp/(h/b) |
D. | h = (h/b) dp |
Answer» A. h = dp/(b/h) |
52. |
Critical angle of electromagnetic radiation takes place if |
A. | angle of incidence is equal to angle of refraction |
B. | angle of incidence is greater than the angle of refraction |
C. | angle of incidence is equal to 90° |
D. | angle of refraction is equal to 90° |
Answer» D. angle of refraction is equal to 90° |
53. |
Earth observations from a satellite platform provide: |
A. | synoptic view of a large area |
B. | constant solar zenith angles and similar illumination conditions |
C. | repetitive observations of the same area with intervals of a few minutes to a few weeks |
D. | all of these |
Answer» D. all of these |
54. |
DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within |
A. | 25 km |
B. | 50 km |
C. | 75 km |
D. | 100 km |
Answer» D. 100 km |
55. |
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 |
Answer» D. all of these |
56. |
Which one of the following residual biases involves the GPS accuracy? |
A. | satellite dependent biases due to uncertainty in the orbital parameters of the satellite |
B. | receiver-dependent biases due to clock stability with line |
C. | signal propagation biases due to the sphere and troposphere propagation |
D. | all the above |
Answer» D. all the above |
57. |
A and B are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct? |
A. | height displacement of a will be less than that of b |
B. | height displacement of b will be less than that of a |
C. | height displacement of a and b is equal |
D. | height displacement of a and b will be towards each other |
Answer» A. height displacement of a will be less than that of b |
58. |
The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is: |
A. | 8 |
B. | 12 |
C. | 16 |
D. | 24 |
Answer» D. 24 |
59. |
Pick up the important characteristic of a target which facilitates its identification from the following: |
A. | spectral variation |
B. | spatial variation |
C. | temporal variation |
D. | all of these |
Answer» D. all of these |
60. |
The value of energy quantum for radiation of any frequency is proportional to: |
A. | the frequency |
B. | the reciprocal of the energy |
C. | the square of the frequency |
D. | the square root of the frequency |
Answer» A. the frequency |
61. |
Which one of the following geometric errors of satellite sensors is random? |
A. | scan skew |
B. | panoramic distortion |
C. | earth rotation |
D. | altitude variation |
Answer» D. altitude variation |
62. |
Pick up the correct statement from the following: |
A. | the first man-made satellite, sputnik-l\ was launched on 4th october, 1957 |
B. | the united state\s explorer 6 transmitted the first picture of the earth in august 1959 |
C. | television infrared observation satellite (tiros) designed for meteorological observations, started systematic earth observations from space from 1, april, 1960 |
D. | all of these |
Answer» D. all of these |
63. |
Which one of the following frequency regions is a part of sun's radiation? |
A. | ultraviolet frequency region |
B. | infrared frequency region |
C. | radio frequency region |
D. | all of these |
Answer» D. all of these |
64. |
The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as: |
A. | ozone hole |
B. | atmospheric window |
C. | ozone window |
D. | black hole |
Answer» B. atmospheric window |
65. |
Which on speed (C) of the electromagnetic wave is correct? |
A. | c = v |
B. | c = /v |
C. | c = v |
D. | c = 1/ |
Answer» C. c = v |
66. |
In GPS, receivers used are; |
A. | electronic clocks |
B. | atomic clocks |
C. | quartz clocks |
D. | mechanical clocks |
Answer» C. quartz clocks |
67. |
For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is: |
A. | 130 km |
B. | 230 km |
C. | 250 km |
D. | 500 km |
Answer» B. 230 km |
68. |
Which one of the following attributes is not associated with digital maps |
A. | colour |
B. | symbology |
C. | legends |
D. | south arrow |
Answer» D. south arrow |
69. |
The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called: |
A. | sensors |
B. | passive sensors |
C. | active sensors |
D. | none of these |
Answer» C. active sensors |
70. |
The most widely used antenna in GPS is |
A. | parabolic antenna |
B. | microstrip antenna |
C. | horn antenna |
D. | slotted antenna |
Answer» B. microstrip antenna |
71. |
Orbital radius of GPS satellites is approximately: |
A. | 15,200 km |
B. | 26,600 km |
C. | 18,400 km |
D. | 36,000 km |
Answer» B. 26,600 km |
72. |
If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by: |
A. | cm = 1/ |
B. | cm |
C. | cm |
D. | none of these |
Answer» B. cm |
73. |
The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target, |
A. | reduces the contrast of the image and also its sharpness |
B. | increases the contrast of the image but reduces the sharpness |
C. | increases both the contrast and sharpness |
D. | reduces the contrast but increases the sharpness |
Answer» A. reduces the contrast of the image and also its sharpness |
74. |
Pick up the correct statement from the following |
A. | the ratio of the up flux and down flux just above the snow surface, is called albedo |
B. | spectral albedo of snow is calculated for the semi-infinite snow thickness |
C. | water equivalent height of snow is the height of water column obtained by melting snow |
D. | all of these |
Answer» D. all of these |
75. |
Spatial variation in horizontal and vertical directions is caused due to: |
A. | physical weathering of rocks |
B. | chemical weathering of rocks |
C. | biological weathering of rocks |
D. | all of these |
Answer» D. all of these |
76. |
The basic requirement of any sensor system is: |
A. | radiometric resolution |
B. | spatial resolution |
C. | spectral resolution |
D. | all of these |
Answer» D. all of these |
77. |
A passive sensor uses: |
A. | sun as the source of energy |
B. | flash light as a source of energy |
C. | its own source of energy |
D. | none of these |
Answer» A. sun as the source of energy |
78. |
Who coined the term, 'Remote sensing'. |
A. | evelyn l. pruitt, a geographer |
B. | gaspard felix tournachon, a french scientist |
C. | wilbur wright, an italian scientist |
D. | none of these |
Answer» A. evelyn l. pruitt, a geographer |
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