### Civil Engineering - Elements of Remote Sensing MCQs Part 3

1. 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

2. In sun light, water rich in phytoplanktons appears :

A.
red
B.
green
C.
brown
D.
blue

3. 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

4. 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.
D.
transmitted through
E.
All of these

5. Which one of the following statements is correct ?

A.
Each satellite of the GPS system transmits two L band signals.
B.
The two L band signals are modulated by the Pseudorandom binary codes (PN).
C.
D.
The PN code determines the time taken by the receiver to reach the receiver which is converted into distance
E.
All of these

6. "All bodies at temperatures above absolute zero degree emit electromagnetic radiation at different wave length", is known as:

A. Plank's law
B. Planktan's law
C. Lambert's cosine law
D. None of these

7. 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.

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

9. Which one of the following statements is correct ?

A. The ratio of the permitivity of a medium and the free space, is called relative permitivity.
B. Dielectric constant is a pure number and has no dimensions.
C. The dielectric constant of pure water is 80.
D. Higher the dielectric constant of a medium, the poorer is its electric conductivity.
E. All of these

10. 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

11. Which one of the following is incorrect statement? While passing through the atmosphere, the solar radiation,

A. remains unaffected
B. gets scattered
C. gets absorbed partially
D. None of these

12. The leaf area index (LAI) is :

A. one sided leaf area per unit area of the ground
B. two sided leaf area per -unit area of the ground
C. the average of the two sided area per unit area of the ground
D. None of these

13. In sun-light water poor in phyto plank tons appears :

A. deep blue
B. red
C. green
D. yellow

14. A remote sensor photographic camera :

A. responses spectrum up to about 0.9 μ
B. does not cover short wave IR region
C. does not cover thermal IR region
D. All the above

15. 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

16. Which one of the following statements is not correct?

A. GIS technology is the same as traditional mapping
B. GIS technology is a tool box for processing maps and fundamental concepts for spatial measurement
C. GIS technology contains analytic capabilities for overlaying maps
D. GIS technology is capable to study the environmental surrondings

17. 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

18. 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

19. Which one of the following can travel through empty space :

A. sound waves
B. water waves
C. electromagnetic waves
D. spring waves

20. 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

21. Pick up the correct statement from the following:

A. Photography was developed in 1826
B. Balloons were used as stable platform for aerial photography in 1903
C. The first aerial photography from an aerocraft was made by Willeur Wright in 1909 in Italy.
D. All of these

22. Pick up the correct statement from the following:

A. Electromagnetic wave is composed of electric and magnetic fields
B. Electric and magnetic fields of electromagnetic wave remain mutually orthogonal and transverse to the direction of propagation.
C. If the electromagnetic wave moves in the z-direction, its electric vector remains in the XY plane along any direction.
D. Polirization defines the orientation of the fields
E. All of these

23. The information system is the chain of the following operations, 1. Collection of data2. Planning the observations3. Analysis of data4. Decision making process Which one of the chains is correct ?

A. 4, 1, 2, 3
B. 2, 1, 3, 4
C. 3, 2, 1, 4
D. 1, 3, 4, 2

24. 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.

25. Pick up the incorrect statement regarding the optical infrared region of the electromagnetic spectrum from the following :

A. visible region, 0.4 μm - 0.7 μm
B. short wave infrared region, 0.7 μ m - 1.5 μm
C. near infrared region, 1.5 μ m - 3.0 μm
D. microwave infrared region, 3.0 μ m - 8.0 μm

26. Phytoplanktons :

A. are microscopic plants
B. are the first link in all the aquatic and marine food chains
C. convert solar energy, dissolved carbon and nitrogen into organic biomass
D. All of these

27. The maximum absorption of solar radiation due to ozone occurs at wave lengths:

A. shorter than 0.3 μm
B. shorter than 0.2 μm
C. greater than 0.3 μm
D. None of these

28. Which one of the following statements is correct to remote sensing?

A. The basic property used to identify objects, is called signature.
B. The ratio of the reflected flux to incident flux is called reflectance which varies fron 0 to 1
C. The surface from which emergent radiance is constant in all directions is called Lambertian surface.
D. All of these.

29. Which one of the following frequencies is a GPS ?

A. L1 with frequency 1520 MHz
B. L1 with frequency 1575.42 MHz
C. L1 with frequency 1227.6 MHz
D. L1 with frequency 1280.43 Hz

30. 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

31. The emission of electrons from a metal plate exposed to light depends on the :

A. intensity of the light
B. frequency of light
C. both (a) and (b)
D. neither (a) nor (b)

32. The range measurements in GPS are made with :

A. 3 L - band frequencies
B. 2 L - band frequencies
C. 2 C - band frequencies
D. 3 C - band frequencies

33. 'A time varying magnetic field produces an electric field'. This phenomenon is known as

A. Newton's law
B. Kirchofflaw
C. Ampere Maxwell law

34. For obtaining accurate distance of the satellite

A. the GPS receiver slides its codes backwards until it synchronises with the satellite signals
B. the signal arrival time is corrected for tropospheric and ionospheric delays
C. the carrier phase measurement technique is adopted
D. All of these

35. GPS has been widely recognized as accurate, fast and cost-effective method for the following:

A. Collection of the geographic coordinate data used in GIS
C. For determination of precise orbit and altitude of low earth orbiting satellites
D. All of these

36. Electromagnetic waves are characterised by :

A. frequency
B. wave length
C. intensity
D. direction of travel and plane of polarisation.
E. All of these

37. The solid angle subtended by the sphere is :

A. 2π
B. 3π
C. 4π
D. 6π

38. For accurate position fix, the three satellites:

A. must be along a common arc
B. must be in vertical line above the receiver
C. must be widely separated and well distributed
D. must be such that one satellite is overhead of the receiver and other two widely separated

39. Pick up the correct statement from the following:

A. Water molecules and salt-ions in the ocean scatter the lower wave length more
B. An increase in the back scattering coefficient with shorter wave length gives a deep blue colour for clear oceanic water
C. The ratio of the upwelling irradiance just below the surface and downwelling irradiance just above the surface is called reflectance ratio.
D. All of these

40. Pick up the correct statement from the following:

A. The wave length of gamma rays is 10-10 m
B. The wave length of radio rays is 106 m
C. The visible length occupies a small portion of the electromagntic spectrum extending roughly from 0.4 μ m to 0.7μm wave length.
D. All of these

41. The various stages of formation of snow are listed below :1. Formation of ice crystals2. Formation of snow pallets3. Formation of snow flakes4. Formationof snow crystals5. Formation of rimed crystalsWhich one of the following sequences is correct ?

A. 3 2 5 1 4
B. 5 3 1 2 4
C. 1 4 3 5 2
D. 1 3 4 2 5

42. Snow consists of

A. snow crystals
B. rimed snow crystals
C. snow flakes
D. All of these

43. 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

44. 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

45. Snow albedo is affected by :

A. wave length
B. grain size
C. solar zenith angle
D. snow pack thickness
E. All of these

6. "All bodies at temperatures above absolute zero degree emit electromagnetic radiation at different wave length", is known as:

A. Plank's law
B. Planktan's law
C. Lambert's cosine law
D. None of these

7. 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.

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

9. Which one of the following statements is correct ?

A. The ratio of the permitivity of a medium and the free space, is called relative permitivity.
B. Dielectric constant is a pure number and has no dimensions.
C. The dielectric constant of pure water is 80.
D. Higher the dielectric constant of a medium, the poorer is its electric conductivity.
E. All of these

10. 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