MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The semi-infinite snow albedo is proportional to the square root of the grain radius : |
| A. | in the 0.2 to 0.4 μm wave length region |
| B. | in the 0.4 to 0.8 μm wave length region |
| C. | in the 0.8 to 1.2 μm wave length |
| D. | None of these |
| Answer» C. in the 0.8 to 1.2 μm wave length | |
| 2. |
If 0 is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to : |
| A. | sin²θ |
| B. | cos²θ |
| C. | sec²θ |
| D. | tan²θ |
| Answer» D. tan²θ | |
| 3. |
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» B. increases the contrast of the image but reduces the sharpness | |
| 4. |
The reflection of solar energy is characterised by the water content in the leaf, in the reflective optical infrared: |
| A. | visible (0.4 - 0.7 μm) region |
| B. | near-IR (0.7 - 1.3 μm) region |
| C. | short wave-IR (1.3 - 2.7 μm) region |
| D. | None of these |
| Answer» D. None of these | |
| 5. |
Which one of the following quantities forms the basis of radiometery? |
| A. | Radiant energy (Q) |
| B. | Radiant flux (φ) |
| C. | Radiant intensity (I) |
| D. | All of these |
| Answer» E. | |
| 6. |
The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths : |
| A. | 0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm |
| B. | 2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm |
| C. | 4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm |
| D. | All of these |
| Answer» E. | |
| 7. |
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» B. the reciprocal of the energy | |
| 8. |
In which part of the reflective optical infrared region, the effect of multiple leaves in vegetation canopy is maximum ? |
| A. | The near-IR (0.7 - 1.3 μm) region |
| B. | The visible (0.4 - 0.7 μm) region |
| C. | The short wave IR (1.3 - 2.7 μm) region |
| D. | In all the above region |
| Answer» B. The visible (0.4 - 0.7 μm) region | |
| 9. |
'A time varrying electric field produces a magnetic field.' This phenemenon is called: |
| A. | Hertz's law |
| B. | Ampere Maxwell's law |
| C. | Faraday's law |
| D. | Kirchoff s law |
| Answer» C. Faraday's law | |
| 10. |
Depending upon the nature of the targeted object and the wave length of the electromagnetic radiation incident on it, the radiation gets : |
| A. | reflected |
| B. | absorbed |
| C. | re-radiated |
| D. | All of these |
| Answer» E. | |
| 11. |
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 | |
| 12. |
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. | All of these |
| Answer» E. | |
| 13. |
Leaf reflactance depends primarily on : |
| A. | the pigments |
| B. | internal cell structure |
| C. | equivalent water content |
| D. | All of these |
| Answer» E. | |
| 14. |
Which one of the following parameters is considered to determine the reflectance of a vegetation canopy |
| A. | Solar zenith angle |
| B. | Azimuth angle |
| C. | Look angle |
| D. | All of these |
| Answer» E. | |
| 15. |
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 | |
| 16. |
Assuming n as the frequency of radiation, n0 as the threshold frequency and k as a constant, the energy of the photo-electrons (E) is related as |
| A. | E = k (n - n0) |
| B. | E = k (n + n0) |
| C. | E = k (n x n0) |
| D. | E = k (n + n0)/2 |
| Answer» B. E = k (n + n0) | |
| 17. |
For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length lcoh is: |
| A. | 130 km |
| B. | 230 km |
| C. | 250 km |
| D. | 500 km |
| Answer» C. 250 km | |
| 18. |
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» B. Height displacement of B will be less than that of A | |
| 19. |
Identification of crops is affected by: |
| A. | the spectral characteristics of the sensor |
| B. | the spatial characteristics of the sensor |
| C. | the radio metric characteristics of the sensor |
| D. | All of these |
| Answer» E. | |
| 20. |
The solid angle subtended by the sphere is : |
| A. | 2π |
| B. | 3π |
| C. | 4π |
| D. | 6π |
| Answer» D. 6π | |
| 21. |
In sun light, water rich in phytoplanktons appears : |
| A. | red |
| B. | green |
| C. | brown |
| D. | blue |
| Answer» C. brown | |
| 22. |
Pick up the correct definition from the following with response to GIS. |
| A. | Common boundry 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. | |
| 23. |
The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called : |
| A. | sensonrs |
| B. | passive sensors |
| C. | active sensors |
| D. | None of these |
| Answer» D. None of these | |
| 24. |
The energy transported by the electromagnetic wave is proportional to : |
| A. | the altitude of the wave |
| B. | the square of the altitude of the wave |
| C. | the cube of the altitude of the wave |
| D. | the square roof of the amplitude |
| Answer» C. the cube of the altitude of the wave | |
| 25. |
The altitudinal distance of a geostationary satelite 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 | |
| 26. |
The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called: |
| A. | passive remote sensing |
| B. | active remote sensing |
| C. | neutral remote sensing |
| D. | None of these |
| Answer» C. neutral remote sensing | |
| 27. |
Fresh and pure snow reflectance |
| A. | is very high in visible region |
| B. | falls off steeply in the near-IR region |
| C. | remains low for longer wave lengths |
| D. | All of these |
| Answer» E. | |
| 28. |
The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called: |
| A. | reflectance |
| B. | reflectance factor |
| C. | albedo |
| D. | none of these |
| Answer» D. none of these | |
| 29. |
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. | |
| 30. |
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 | |
| 31. |
The phase difference of the waves 1 and 2 at A in the given figure is : |
| A. | π/4 |
| B. | π/2 |
| C. | π |
| D. | 3π/2 |
| Answer» C. π | |
| 32. |
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. | D |
| Answer» C. C | |
| 33. |
Which one of the following relationship between the wave length (λ), and frequency and the speed (C) of the electromagnetic wave is correct ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 34. |
Which one of the following helps to identify the objects on the earth surface? |
| A. | Atmospheric window |
| B. | Signature |
| C. | Radiometric error |
| D. | None of these |
| Answer» C. Radiometric error | |
| 35. |
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. | |
| 36. |
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 | |
| 37. |
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 | |
| 38. |
In GPS, receivers are used are; |
| A. | Electronic clocks |
| B. | Atomic clocks |
| C. | Quartz clocks |
| D. | Mechanical clocks |
| Answer» D. Mechanical clocks | |
| 39. |
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» E. | |
| 40. |
Which one of the following parameters is considered to determine the reflectance of a vegetation canopy? |
| A. | Solar zenith angle |
| B. | Azimuth angle |
| C. | Look angle |
| D. | All of these |
| Answer» E. | |
| 41. |
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 | |
| 42. |
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 | |
| 43. |
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 | |
| 44. |
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. | Cm = 1/εμ |
| B. | Cm = 1/√8 μ |
| C. | Cm = 5/√εμ |
| D. | None of these |
| Answer» C. Cm = 5/√εμ | |
| 45. |
Which one of the following errors is produced by platform characteristics of the sensor? |
| A. | Altitude variation |
| B. | Altitude |
| C. | Orbit drift |
| D. | All of these |
| Answer» E. | |
| 46. |
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 - 5 m if rover is less than 2-5 km 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 - 5 m if rover is less than 2-5 km from the reference station | |
| 47. |
The normal altitude of GPS satellite is about |
| A. | 16,200 km |
| B. | 20,200 km |
| C. | 24,400 km |
| D. | 36,100 km |
| Answer» C. 24,400 km | |
| 48. |
The most widely used antenna in GPS is |
| A. | Parabolic antenna |
| B. | Microstrip antenna |
| C. | Horn antenna |
| D. | Slotted antenna |
| Answer» C. Horn antenna | |
| 49. |
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 (θr) is given by sin θ₂ = (n₁/n₂) sin θi |
| C. | Both (A) and (B) |
| D. | Neither (A) nor (B) |
| Answer» C. Both (A) and (B) | |
| 50. |
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» B. Gaspard Felix Tournachon, a French scientist | |