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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.
| 101. |
The reflection of solar energy is characterized by the water content in the leaf, in the reflective optical infrared: |
| A. | isible (0.4 - 0.7 μm) region |
| B. | ear-IR (0.7 - 1.3 μm) region |
| C. | hort wave-IR (1.3 - 2.7 μm) region |
| D. | one of these |
| Answer» D. one of these | |
| 102. |
'A time varying electric field produces a magnetic field.' This phenomenon is called: |
| A. | ertz's law |
| B. | mpere Maxwell's law |
| C. | araday's law |
| D. | irchoff’s law |
| Answer» C. araday's law | |
| 103. |
The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths: |
| A. | .4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm |
| B. | .2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm |
| C. | .2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm |
| D. | ll of these |
| Answer» E. | |
| 104. |
Which one of the following helps to identify the objects on the earth surface? |
| A. | tmospheric window |
| B. | ignature |
| C. | adiometric error |
| D. | one of these |
| Answer» C. adiometric error | |
| 105. |
Electromagnetic radiation: |
| A. | roduces a time varying magnetic field and vice versa |
| B. | nce generated, remains self-propagating |
| C. | s capable to travel across space |
| D. | ll of these |
| Answer» E. | |
| 106. |
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. | = dp/(B/H) |
| B. | = (B/H) dp |
| C. | = dp/(H/B) |
| D. | = (H/B) dp |
| Answer» B. = (B/H) dp | |
| 107. |
Geodimeter is based on: |
| A. | ropagation of modulated light waves |
| B. | ropagation of infrared radiation |
| C. | he visible light as carrier with frequency of the order of 5 × 1014 Hz |
| D. | igh frequency radio waves |
| Answer» B. ropagation of infrared radiation | |
| 108. |
Which one of the following geometric errors of satellite sensors is random? |
| A. | can skew |
| B. | anoramic distortion |
| C. | arth rotation |
| D. | ltitude variation |
| Answer» E. | |
| 109. |
"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. | resnel reflection |
| B. | resnel refraction |
| C. | nell's law |
| D. | one of these |
| Answer» B. resnel refraction | |
| 110. |
Which one of the following parameters is considered to determine the reflectance of a vegetation canopy? |
| A. | olar zenith angle |
| B. | zimuth angle |
| C. | ook angle |
| D. | ll of these |
| Answer» E. | |
| 111. |
A perfectly black body: |
| A. | s a diffuse emitter |
| B. | bsorbs all the radiations of every wave lengths |
| C. | mits power of every wave length |
| D. | ll the above |
| Answer» E. | |
| 112. |
Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects: |
| A. | lectric waves |
| B. | ound waves |
| C. | lectromagnetic waves |
| D. | ind waves |
| Answer» D. ind waves | |
| 113. |
For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is: |
| A. | 30 km |
| B. | 30 km |
| C. | 50 km |
| D. | 00 km |
| Answer» C. 50 km | |
| 114. |
The altitudinal distance of a geostationary satellite from the earth is about: |
| A. | 6,000 km |
| B. | 0,000 km |
| C. | 6,000 km |
| D. | 4,000 km |
| Answer» D. 4,000 km | |
| 115. |
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. | m = 1/εμ |
| B. | m = 1/√8 μ |
| C. | m = 5/√εμ |
| D. | one of these |
| Answer» C. m = 5/√εμ | |
| 116. |
Which one of the following errors is produced by platform characteristics of the sensor? |
| A. | ltitude variation |
| B. | ltitude |
| C. | rbit drift |
| D. | ll of these |
| Answer» E. | |
| 117. |
Which one of the following parameters is accurate for DGPS? |
| A. | ositional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station |
| B. | ositional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station |
| C. | ositional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station |
| D. | ositional accuracies ~ 5 - 10 m if rover is less than 25 km |
| Answer» B. ositional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station | |
| 118. |
Which one of the following relationship between the wave length (λ), and frequency and the speed (C) of the electromagnetic wave is correct? |
| A. | = v + λ |
| B. | = λ/v |
| C. | = vλ |
| D. | = 1/λv |
| Answer» D. = 1/λv | |
| 119. |
The changes in the reflectivity/emissivity with time, is called: |
| A. | pectral variation |
| B. | patial variation |
| C. | emporal variation |
| D. | one of these |
| Answer» D. one of these | |
| 120. |
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its |
| A. | ix ground stations |
| B. | ive ground stations |
| C. | our ground stations |
| D. | hree ground stations |
| Answer» C. our ground stations | |
| 121. |
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. | he angle of incidence is equal to the angle of refraction |
| B. | he angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi |
| C. | oth (A) and (B) |
| D. | either (A) nor (B) |
| Answer» C. oth (A) and (B) | |
| 122. |
Who coined the term, ‘Remote sensing’. |
| A. | velyn L. Pruitt, a geographer |
| B. | aspard Felix Tournachon, a French scientist |
| C. | ilbur Wright, an Italian scientist |
| D. | one of these |
| Answer» B. aspard Felix Tournachon, a French scientist | |
| 123. |
Sensor IFOV is proportional to: |
| A. | in² |
| B. | os² |
| C. | ec² |
| D. | an² |
| Answer» D. an² | |
| 124. |
The value of energy quantum for radiation of any frequency is proportional to: |
| A. | he frequency |
| B. | he reciprocal of the energy |
| C. | he square of the frequency |
| D. | he square root of the frequency |
| Answer» B. he reciprocal of the energy | |
| 125. |
If θ is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to: |
| A. | in²θ |
| B. | os²θ |
| C. | ec²θ |
| D. | an²θ |
| Answer» D. an²θ | |
| 126. |
The various stages occuring in GPS system are described below:1. Generation of an output to the user2. Detection of the GPS signals3. Processing the data in the built-in-computer4. Decoding the GPS signal.The correct sequence of the stages is: |
| A. | , 2, 3, 4 |
| B. | , 3, 4, 1 |
| C. | , 4, 3, 1 |
| D. | , 1, 2, 4 |
| Answer» D. , 1, 2, 4 | |
| 127. |
The object of photo-interpretation is: |
| A. | dentification |
| B. | ecognition of objects |
| C. | udging the significance of objects |
| D. | ll of these |
| Answer» E. | |
| 128. |
Leaf reflectance depends primarily on: |
| A. | he pigments |
| B. | nternal cell structure |
| C. | quivalent water content |
| D. | ll of these |
| Answer» E. | |
| 129. |
‘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. | eight displacement of A will be less than that of B |
| B. | eight displacement of B will be less than that of A |
| C. | eight displacement of A and B is equal |
| D. | eight displacement of A and B will be towards each other |
| Answer» B. eight displacement of B will be less than that of A | |
| 130. |
The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called: |
| A. | pectral variation |
| B. | patial variation |
| C. | emporal variation |
| D. | one of these |
| Answer» C. emporal variation | |
| 131. |
Which one of the following quantities forms the basis of radiometry? |
| A. | adiant energy (Q) |
| B. | adiant flux (φ) |
| C. | adiant intensity (I) |
| D. | ll of these |
| Answer» E. | |
| 132. |
The phase difference of the waves 1 and 2 at A in the given figure is: |
| A. | /4 |
| B. | /2 |
| C. | /1 |
| D. | π/2 |
| Answer» C. /1 | |
| 133. |
Pick up the incorrect statement regarding the optical infrared region of the electromagnetic spectrum from the following : |
| A. | |
| B. | visible region, 0.4 μm - 0.7 μm |
| C. | short wave infrared region, 0.7 μ m - 1.5 μm |
| Answer» C. short wave infrared region, 0.7 Œº m - 1.5 Œºm | |
| 134. |
The main functional blocks of a mul-tispectral scanner (MSS) are given below :1. Video processor2. Dispersive system3. Detector4. Signal conditioner5. Collecting opticsWhich one of the following sequences is correct? |
| A. | 1, 4, 5, 3, 2 |
| B. | 5, 3, 2, 4, 1 |
| C. | 5, 2, 3, 1, 4 |
| D. | 1, 3, 2, 4, 5 |
| Answer» D. 1, 3, 2, 4, 5 | |
| 135. |
Which one of the following statements regarding remote sensing is correct. |
| A. | The interaction of the electromagnetic radiation with the target |
| B. | The emission of electromagnetic radiation from the target |
| C. | both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» D. Neither (a) nor (b) | |
| 136. |
Coherence of two electromagnetic waves takes place if their phase difference is : |
| A. | three ground stations |
| B. | constant in time |
| C. | constant in space |
| D. | constant in time and space |
| Answer» D. constant in time and space | |
| 137. |
Earth observations from a satellite platform provides : |
| A. | None of these |
| B. | synoptic view of a large area |
| C. | constant solar zenith angles and similar illumination conditions. |
| D. | repetitive observations of the same area with intervals of a few minutes to a few weeks |
| Answer» E. | |
| 138. |
For perfect coherent radiation, which one of the following statement is correct? |
| A. | Both the waves must have single frequencies |
| B. | The directions of motion of both waves are parallel. |
| C. | The waves must be collimated |
| D. | All of these |
| Answer» E. | |
| 139. |
Remote sensing techniques are being usefully employed for the purpose of: |
| A. | improving natural resource management |
| B. | land use |
| C. | protection of the environment |
| D. | All of these |
| Answer» E. | |
| 140. |
The various stages occuring in GPS system are described below :1. Generation of an output to the user2. Detection of the GPS signal3. Processing the data in the built-in-computer4. Decoding the GPS signal.The correct sequence of the stages is : |
| A. | 1, 2, 3, 4 |
| B. | 2, 3, 4, 1 |
| C. | 2, 4, 3, 1 |
| D. | 3, 1, 2 , 4 |
| Answer» D. 3, 1, 2 , 4 | |
| 141. |
Which one of the following parameters is accurate for DGPS. |
| A. | Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station |
| B. | Positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station |
| C. | Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station |
| D. | Positional accuracies ~ 5 - 10 m if rover is less than 25 km |
| Answer» B. Positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station | |
| 142. |
According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on an other medium (refractive index m2); |
| A. | the angle of incidence is equal to the angle of refraction |
| B. | the angle of refraction (θr) is given by |
| C. | Both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» C. Both (a) and (b) | |
| 143. |
Snow consists of |
| A. | snow crystals |
| B. | rimed snow crystals |
| C. | snow flakes |
| D. | All of these |
| Answer» E. | |
| 144. |
With the increase of turbidity, the muddy water appears brown due to the shift of the upward radiance peak towards : |
| A. | red |
| B. | green |
| C. | yellow |
| D. | blue |
| Answer» B. green | |
| 145. |
The solid angle subtended by the sphere is : |
| A. | All of these |
| B. | 2π |
| C. | 3π |
| D. | 4π |
| Answer» D. 4œÄ | |
| 146. |
Which one of the following statements is correct regarding the GPS satellites ? |
| A. | The nominal altitude is about 20, 200 km |
| B. | The inclination of axis satellite is 55° |
| C. | The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz) |
| D. | All of these |
| Answer» E. | |
| 147. |
Remote sensing techniques makes use of the properties of-----emitted, reflected or diffracted by the sensed objects: |
| A. | electric waves |
| B. | soundwaves |
| C. | electromagnetic waves |
| D. | wind waves |
| Answer» D. wind waves | |
| 148. |
Snow cover on the earth surface : |
| A. | gives the highest reflectance in the visible spectrum |
| B. | shows marked variation in its reflectance characteristics |
| C. | Shows side variation in the grain size |
| D. | All the above |
| Answer» E. | |
| 149. |
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 area 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 | |
| 150. |
Which one of the following can travel through empty space : |
| A. | sound waves |
| B. | water waves |
| C. | electromagnetic waves |
| D. | spring waves |
| Answer» D. spring waves | |