Civil Engineering - Elements of Remote Sensing MCQs Part 2

1. Which one of the following statements is correct?

A.
The function of an information system is to improve ones ability to make decisions

B.
The information system is the chain of operations

C.
A map is a collection of stored, analysed data, its stored information is suitability used in making decisions

D.
All the above

 Answer Option D

2. 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 Option B

3. 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 Option B

4. 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.
Forest fires

E.
All of these

 Answer Option E

5. Orbital radius of GPS satellites is approximately:

A.
15,200 km

B.
26,600 km

C.
18,400 km

D.
36,000 km

 Answer Option B

6. Which one of the following statement is incorrect regarding the electromagnetic radiation?

A. These are produced by the motion of electric charge

B. The oscillation of charged particles sets up changing electric fields.

C. The changing electric fields induce the changing magnetic fields in the surrounding medium.

D. None of these

 Answer Option D

7. 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 Option A

8. Which one of the following statements is correct?

A. π radians equal to 180°.

B. The cone subtended by an area on the sphere at the centre, is called the solid angle.

C. The solid angle is equal to the ratio of the area on the sphere and the square of the radius of the sphere.

D. The unit of the solid angle is steradian (Sr)

E. All of these

 Answer Option E

9. 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.

B.

C.

D.

 Answer Option A

10. In GPS, receivers are used are ;

A. electronic clocks

B. atomic clocks

C. quartz clocks

D. mechanical clocks

 Answer Option C

11. Formation of snow occurs if the cloud temperature is

A. just above the freezing point

B. at the freezing point

C. below the freezing point

D. None of these

 Answer Option C

12. 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 Option B

13. For interpolation of satellite data used for monitoring dynamic changes that occure 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 Option B

14. 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 Option C

15. Geodimeter is based on :

A. propogation of modulated light waves

B. propogation of infrared radiation

C. the visible light as carrier with frequency of the order of 5 x 1014Hz

D. high frequency radio waves.

 Answer Option A

16. 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 Option A

17. The infrared portion of EMR lies between

A. 0.4 - 0.7 μm

B. 0.5 mm to lm

C. 0.7 - 1.3 μm

D. 0.7 to 14 μm

 Answer Option D

18. Who coined the term, 'Remote sensing'.

A. Evelyn L. Pruitt, a geographer

B. Gaspard Felix Tournachon, a French scientist

C. Wilbur Wright, an Italian sciencist

D. None of these

 Answer Option A

19. 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 Option B

20. Pick up the correct statement from the following:

A. A graphical representation of spectral reflectance versis the various growth stages of a crop, depicts a phenologic pattern

B. The changes in the polarisation of the radiation reflected or emitted by an object, is known as polarisation variation.

C. The degree of polarisation is a characteristic of the object which helps in the identification of the object.

D. Signatures only provide statistical nature and are not completely deterministic

E. All of these

 Answer Option E

21. The optical property of a water body depends on:

A. absorption by the disolved material

B. absorption by the suspended particulate matter

C. scattering by the surpended particulate matter

D. All of these

 Answer Option D

22. Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:

A. USA

B. European Union

C. Russia

D. India

 Answer Option D

23. 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 Option E

24. 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 Option C

25. 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 Option D

26. The code based GPS receivers are generally used for:

A. Vehicle tracking

B. Land navigation

C. Trans movement

D. All of these

 Answer Option D

27. 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 Option D

28. The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is :

A. 8

B. 12

C. 16

D. 24

 Answer Option D

29. Pick up the correct statement from the following:

A. For the same feature, the photograph taken from the satellite vertically above the aircraft, the height displacement is lesser than the the aerial photograph.

B. The scale of the aerial photograph depends upon the scale of the topography

C. The feature at the principal point has no height displacement.

D. The scale of the topography of regions of higher elevation with the same flying height, is larger than that of the area of lower elevation.

E. All of the above

 Answer Option E

30. 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 Option D

31. Pick up the correct statement from the following :

A. Frequency is the number of wave crests passing a fixed point in one second

B. Frequency of a wave is measured in Hertz (Hz)

C. Amplitude of a wave is the height of its crust from the mid-point.

D. The square of the amplitude is proportional to the energy transported by the wave.

E. All of these

 Answer Option E

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.

B.

C.

D. None of these

 Answer Option B

33. Earth observations from a satellite platform provides :

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 Option D

34. Due to scan geometery of a satellite sensor:

A. the off-nadir resolution is degraded

B. the ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir

C. the details towards the edge of the scan get compressed

D. All of these

 Answer Option D

35. '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 Option B

36. Which one of the following quantities forms the basis of radiometery?

A. Radiant energy (Q)

B. Radiant flux (φ)

C. Radiant intensity (I)

D. Radiance (L)

E. All of these

 Answer Option E

37. The maximum sun's radiation occurs around:

A. 0.4 μm wave length

B. 0.55 μ wave length

C. 0.7 μ wave length

D. None of these

 Answer Option B

38. Pick up the correct statement from the following :

A. The minimum frequency of light for which no electrons are emitted, is called threshold frequency.

B. Polarising angle of glass is 57°.5

C. At the polarising angle, the reflected and refracted rays are orthogonal

D. All the above

 Answer Option D

39. Pick up the correct statement from the following:

A. The refractive index of a medium varies according to the wavelength of the radiation,

B. The variation of the refractive index with wave length, is called dispersion,

C. The splitting of colours of white light by passing through a prism, is caused due to dispersion.

D. All the these

 Answer Option D

40. Which one of the following attributes is not associated with digital maps

A. colour

B. symbology

C. legends

D. south arrow

 Answer Option D

41. The object of photo-intepretation is:

A. identification

B. recognition of objects

C. judging the significance of objects

D. All of these

 Answer Option D

42. Pick up the correct statement from the following :

A. The first man-made satellite, Sputnikl' 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. U.S.A.'s highly secret mission CORONA started the collection of intelligence photograpy in 1960

E. All of these.

 Answer Option E

43. 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 Option E

44. DGPS is based on the concept that bais 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

E. 1250 km

 Answer Option D

45. The reflectance from a surface is called specular reflection if it follows: .

A. Snells's law

B. Lambert's cosine law

C. Planktan's law

D. All of these

 Answer Option A

46. The changes in the reflectivity/emis-sivity with time, is called :

A. spectral variation

B. spatial variation

C. temporal variation

D. None of these

 Answer Option C

47. 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 Option B

48. Pick up the correct statement from the following:

A. Phytoplankton contains photosyn-thetically active pigment.

B. An increase of phytoplankton increases the back scattering in the green region

C. An increase of phytoplankton absorbs the bule region rapidly

D. An increase of phytoplankon decreases the back scattering in the green region

 Answer Option D

49. Which one of the following factors does not affect the scale of the air photographs :

A. focal length

B. flying height

C. ground elevation

D. None of these

 Answer Option D

50. While propagating through homogeneous, isotropic media,

A. directions of both the fields are orthogonal

B. both the fields are at right angles to the direction of propagation.

C. both (a) and (b)

D. niether (a) nor (b)

 Answer Option C