MCQOPTIONS
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MCQOPTIONS
This section includes 228 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
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» D. None of these | |
| 52. |
The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is_______________? |
| A. | 8 |
| B. | 12 |
| C. | 16 |
| D. | 24 |
| Answer» E. | |
| 53. |
The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from__________________? |
| A. | 10-10 to 106 m |
| B. | 10-8 to 106 m |
| C. | 10-10 to 1010 m |
| D. | 10-8 to 108 m |
| Answer» B. 10-8 to 106 m | |
| 54. |
The coherence length over which there is a strong relationship between amplitudes is_________________? |
| A. | Directly proportional to the bandwidth |
| B. | Inversely proportional to the bandwidth |
| C. | The square of the bandwidth |
| D. | None of these |
| Answer» C. The square of the bandwidth | |
| 55. |
The code based GPS receivers are generally used for_________________? |
| A. | Vehicle tracking |
| B. | Land navigation |
| C. | Trans movement |
| D. | All of these |
| Answer» E. | |
| 56. |
The changes in the reflectivity/emissivity with time, is called ? |
| A. | Spectral variation |
| B. | Spatial variation |
| C. | Temporal variation |
| D. | None of these |
| Answer» D. None of these | |
| 57. |
The basic requirement of any sensor system is___________________? |
| A. | Radiometric resolution |
| B. | Spatial resolution |
| C. | Spectral resolution |
| D. | All of these |
| Answer» E. | |
| 58. |
The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called_________________? |
| A. | Spectral variation |
| B. | Spatial variation |
| C. | Temporal variation |
| D. | None of these |
| Answer» C. Temporal variation | |
| 59. |
The altitudinal distance of a geostationary satellite from the earth is about_________________? |
| A. | 26,000 km |
| B. | 30,000 km |
| C. | 36,000 km |
| D. | 44,000 km |
| Answer» D. 44,000 km | |
| 60. |
Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena________________? |
| A. | Cloud evolution |
| B. | Vegetative cover |
| C. | Snow cover |
| D. | All of these |
| Answer» E. | |
| 61. |
Remote sensing techniques make use of the properties of ______________ emitted, reflected or diffracted by the sensed objects? |
| A. | Electric waves |
| B. | Sound waves |
| C. | Electromagnetic waves |
| D. | Wind waves |
| Answer» D. Wind waves | |
| 62. |
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» E. | |
| 63. |
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 |
| Answer» E. | |
| 64. |
Pick up the correct definition from the following with response to GIS_______________? |
| A. | Common boundary between two areas of a locality is known as adjacency |
| B. | The area features which are wholly contained within another area feature, is known so containment |
| C. | The geometric property which describes the linkage between line features is defined as connectivity |
| D. | All of these |
| Answer» E. | |
| 65. |
Orbital radius of GPS satellites is approximately ___________________? |
| A. | 15,200 km |
| B. | 26,600 km |
| C. | 18,400 km |
| D. | 36,000 km |
| Answer» C. 18,400 km | |
| 66. |
Leaf reflectance depends primarily on______________? |
| A. | The pigments |
| B. | Internal cell structur |
| C. | Equivalent water content |
| D. | All of these |
| Answer» E. | |
| 67. |
In GPS, receivers used are___________________? |
| A. | Electronic clocks |
| B. | Atomic clocks |
| C. | Quartz clocks |
| D. | Mechanical clocks |
| Answer» D. Mechanical clocks | |
| 68. |
In case of reflection and refraction of electromagnetic radiation ? |
| A. | Angle of incidence = angle of refraction |
| B. | Angle of incidence = angle of reflection |
| C. | Angle of refraction = sum of the angles of incidence and refraction |
| D. | All the above |
| Answer» C. Angle of refraction = sum of the angles of incidence and refraction | |
| 69. |
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» B. h = (B/H) dp | |
| 70. |
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/εμ |
| B. | Cm = 1/√8 μ |
| C. | Cm = 5/√εμ |
| D. | None of these |
| Answer» C. Cm = 5/√εμ | |
| 71. |
Geodimeter is based on_________________? |
| A. | Propagation of modulated light waves |
| B. | Propagation of infrared radiation |
| C. | The visible light as carrier with frequency of the order of 5 × 1014 Hz |
| D. | High frequency radio waves |
| Answer» B. Propagation of infrared radiation | |
| 72. |
For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is______________? |
| A. | Circular orbit |
| B. | Sun-synchronous orbit |
| C. | Near polar orbit |
| D. | None of these |
| Answer» C. Near polar orbit | |
| 73. |
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» C. 250 km | |
| 74. |
Electromagnetic spectrum contains________________? |
| A. | Gamma rays (wave length < 10-10 m) |
| B. | Ultraviolet rays (wave length < 10-6 m) |
| C. | Infrared rays (wave length < 10 -4 m) |
| D. | All of these |
| Answer» E. | |
| 75. |
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» E. | |
| 76. |
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» E. | |
| 77. |
Due to scan geometry of a satellite sensor____________________? |
| A. | The off-nadir resolution is degraded |
| B. | The ground distance swept by the senor, IFOV is proportional to sec2 of scan measured from the nadir |
| C. | The details towards the edge of the scan get compressed |
| D. | All of these |
| Answer» E. | |
| 78. |
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its_______________________? |
| A. | Six ground stations |
| B. | Five ground stations |
| C. | Four ground stations |
| D. | Three ground stations |
| Answer» C. Four ground stations | |
| 79. |
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» E. | |
| 80. |
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» E. | |
| 81. |
Consider the following statements regarding the satellite imaging_________________?_x005F_x000D_1. The satellite orbit is fixed in the inertial space_x005F_x000D_2. During successive across-track imaging, the earth rotates beneath the sensor_x005F_x000D_3. The satellite images a skewed area_x005F_x000D_Which one of the following statements is/are correct? |
| A. | 1, 2, 3 |
| B. | 1, 3 |
| C. | 2, 3 |
| D. | 1, 2 |
| Answer» B. 1, 3 | |
| 82. |
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 |
| Answer» D. None of these | |
| 83. |
“An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media”. This phenomenon is known as___________________? |
| A. | Fresnel reflection |
| B. | Fresnel refraction |
| C. | Snell’s law |
| D. | None of these |
| Answer» B. Fresnel refraction | |
| 84. |
According to the Snell’s law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index m2)________________? |
| A. | The angle of incidence is equal to the angle of refraction |
| B. | The angle of refraction r) is given by sin i |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. and B. | |
| 85. |
A reduction of nitrogen nutrient in plants_______________? |
| A. | Affects leaf colour |
| B. | Reduces pigment concentration |
| C. | Increase the visible reflectivity |
| D. | All of these |
| Answer» E. | |
| 86. |
A passive sensor uses ________________? |
| A. | Sun as the source of energy |
| B. | Flash light as a source of energ |
| C. | Its own source of energy |
| D. | None of these |
| Answer» B. Flash light as a source of energ | |
| 87. |
Which one of the following statement is correct ? |
| A. | Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation |
| B. | The rate of transfer of radiant energy is called flux and is expressed in watts. |
| C. | The radiant energy which falls upon a surface, is termed as irradiance. |
| D. | The radiant energy which falls away from the surface is termed as radient exitance and is measured in Wm-2 |
| E. | All of these |
| Answer» F. | |
| 88. |
'A time varying magnetic field produces an electric field'. This phenomenon is known as |
| A. | Newton's law |
| B. | Kirchofflaw |
| C. | Ampere Maxwell law |
| D. | Faraday's law |
| Answer» E. | |
| 89. |
Polarising angle (i) and refractive index (μ) of the reflecting surface are related by: |
| A. | sin i = μ |
| B. | cos i = μ |
| C. | tan i = μ |
| D. | [D]. |
| Answer» D. [D]. | |
| 90. |
Which one of the following relationship between the wave length (λ), and frequency and the speed (C) of the electromagnetic wave is correct ? |
| A. | C = v + λ |
| B. | [B]. |
| C. | C = vλ |
| D. | [D]. |
| Answer» D. [D]. | |
| 91. |
Pick up the correct statement from to following: |
| A. | For complete temporal coherence, the waves must be mono chromatic. |
| B. | For spatial coherence, the phase difference between two points in space is constant with time. |
| C. | Superposition of the coherent waves produce interference |
| D. | With 0 phase difference, the constructive interference takes place. |
| E. | All of these |
| Answer» F. | |
| 92. |
Electromagnetic spectrum contains : |
| A. | gamma rays (wave length < 10-10 m) |
| B. | ultraviolet rays (wave length < 10-6 m) |
| C. | infrared rays (wave length < 10-4 m) |
| D. | radio rays (wave length > 1 m) |
| E. | All of these |
| Answer» F. | |
| 93. |
If electric permittivity and magnetic permeability of the medium are respectively ε and μ, then the velocity (Cm) of the electromagnetic wave in the medium is given by : |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | None of these |
| Answer» C. [C]. | |
| 94. |
Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena: |
| A. | loud evolution |
| B. | egetative cover |
| C. | now cover |
| D. | ll of these |
| Answer» E. | |
| 95. |
A reduction of nitrogen nutrient in plants: |
| A. | ffects leaf color |
| B. | educes pigment concentration |
| C. | ncrease the visible reflectivity |
| D. | ll of these |
| Answer» E. | |
| 96. |
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. | 5 km |
| B. | 0 km |
| C. | 5 km |
| D. | 00 km |
| Answer» E. | |
| 97. |
A passive sensor uses: |
| A. | un as the source of energy |
| B. | lash light as a source of energy |
| C. | ts own source of energy |
| D. | one of these |
| Answer» B. lash light as a source of energy | |
| 98. |
The basic requirement of any sensor system is: |
| A. | adiometric resolution |
| B. | patial resolution |
| C. | pectral resolution |
| D. | ll of these |
| Answer» E. | |
| 99. |
Consider the following statements regarding the satellite imaging:1. The satellite orbit is fixed in the inertial space2. During successive across-track imaging, the earth rotates beneath the sensor3. The satellite images a skewed areaWhich one of the following statements is/are correct? |
| A. | , 2, 3 |
| B. | , 3 |
| C. | , 3 |
| D. | , 2 |
| Answer» B. , 3 | |
| 100. |
The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called: |
| A. | ensors |
| B. | assive sensors |
| C. | ctive sensors |
| D. | one of these |
| Answer» D. one of these | |