elements of remote sensing Mcqs
2. The refractive index of the ocean water_______________?
comments icon0

A. Decreases with salinity

B. Increases with temperature

C. Decreases with temperature

D. Increases with salinity
4. While propagating through homogeneous, isotropic media_________________?
comments icon0

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. Neither A. nor B.

5. Due to scan geometry of a satellite sensor____________________?
comments icon0
A. All of these

B. The off-nadir resolution is degraded

C. The ground distance swept by the senor, IFOV is proportional to sec2 of scan measured from the nadir

D. The details towards the edge of the scan get compressed

6. Pick up the correct statement from the following?
comments icon0
A. All of these

B. The wave whose surface of constant phase are parallel planes, is known as a plane wave

C. The relative phase difference between the waves is important and not the absolute phase of a point on the wave

D. The surface defined by the locus of points having same phase, is called a wave front

7. Pick up the correct definition from the following with response to GIS_______________?
comments icon0
A. All of these

B. The area features which are wholly contained within another area feature, is known so containment

C. Common boundary between two areas of a locality is known as adjacency

D. The geometric property which describes the linkage between line features is defined as connectivity

8. The optical property of a water body depends on ?
comments icon0

A. Scattering by the suspended particulate matter

B. Absorption by the dissolved material

C. Absorption by the suspended particulate matter

D. All of these
9. Which one of the following factors does not affect the scale of the air photographs ?
comments icon0

A. Focal length

B. Ground elevation

C. None of these

D. Flying height

10. Pick up the correct statement from the following?
comments icon0

A. Polarising angle of glass is 57.5

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

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

D. All the above
11. The normal altitude of GPS satellite is about________________?
comments icon0

A. 16,200 km

B. 20,200 km

C. 24,400 km

D. 36,100 km

13. Pick up the correct statement from the following ?
comments icon0
A. All of these

B. The reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction

C. Phase is usually specified by angular measure with one period being 360

D. Phase of a wave is expressed as a fraction of a period with respect to a reference

14. Which one of the following parameters is accurate for DGPS ?
comments icon0
A. Positional accuracies ~ 1 2 m if rover is less than 1-2 km from the reference station

B. Positional accuracies ~ 5 10 m if rover is less than 25 km

C. Positional accuracies ~ 5 10 m if rover is less than 5-10 km from reference station

D. Positional accuracies ~ 2 5m if rover is less than 2-5 fm from the reference station

18. Pick up the correct statement from the following ?
comments icon0

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

B. A graphical representation of spectral reflectance verses the various growth stages of a crop, depicts a phonologic pattern

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

D. All of these
23. Coherence of two electromagnetic waves takes place if their phase difference is_________________?
comments icon0
A. Constant in time and space

B. Constant in space

C. None of these

D. Constant in time

25. Who coined the term, Remote sensing_______________?
comments icon0
A. Evelyn L. Pruitt, a geographer

B. None of these

C. Gaspard Felix Tournachon, a French scientist

D. Wilbur Wright, an Italian scientist

26. Which one of the following helps to identify the objects on the earth surface ?
comments icon0

A. Atmospheric window

B. None of these

C. Signature

D. Radiometric error

28. Which one of the following quantities forms the basis of radiometry ?
comments icon0

A. Radiant energy (Q)

B. All of these

C. Radiant intensity (I)

D. Radiant flux (?e )

29. In GPS, receivers used are___________________?
comments icon0

A. Mechanical clocks

B. Quartz clocks

C. Atomic clocks

D. Electronic clocks

30. 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?
comments icon0

A. Height displacement of B will be less than that of A

B. Height displacement of A will be less than that of B

C. Height displacement of A and B is equal

D. Height displacement of A and B will be towards each other

31. Which one of the following geometric errors of satellite sensors is random ?
comments icon0

A. Earth rotation

B. Altitude variation

C. Scan skew

D. Panoramic distortion

34. Pick up the correct statement from the following ?
comments icon0
A. All of these

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

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

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

35. Leaf reflectance depends primarily on______________?
comments icon0

A. The pigments

B. Internal cell structur

C. All of these

D. Equivalent water content

36. Which one of the following statements is correct regarding the GPS satellites ?
comments icon0
A. All of these

B. The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)

C. The nominal altitude is about 20,200 km

D. The inclination of axis satellite is 55

37. Pick up the correct statement from the following ?
comments icon0

A. Platforms may be either stationary or mobile

B. All of these

C. In remote sensing technique, the observation place, is called a platform

D. Spatial resolution of the imaging system becomes poorer with increase of platform height

38. Pick up the correct statement from the following ?
comments icon0

A. Indian space effort started in 1962 with the establishment of a rocket

B. Indian Space Research Organisation (ISRO) is responsible for the space technology and its application to various activities

C. All of these

D. Development of space (DOS) was established by the Government of India in 1972

39. Electromagnetic radiation_______________?
comments icon0

A. Produces a time varying magnetic field and vice versa

B. Is capable to travel across space

C. Once generated, remains self-propagating

D. All of these
40. The object of photo-interpretation is__________________?
comments icon0

A. Identification

B. All of these

C. Recognition of objects

D. Judging the significance of objects

41. Pick up the important characteristic of a target which facilitates its identification from the following ?
comments icon0

A. Temporal variation

B. Spectral variation

C. Spatial variation

D. All of these
42. Pick up the correct statement from the following?
comments icon0

A. An increase of phytoplankton absorbs the bule region rapidly

B. Phytoplankton contains photosynthetically active pigment

C. An increase of phytoplankton decreases the back scattering in the green region

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

43. According to the Snells law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index m2)________________?
comments icon0

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.

46. The coherence length over which there is a strong relationship between amplitudes is_________________?
comments icon0

A. None of these

B. Inversely proportional to the bandwidth

C. The square of the bandwidth

D. Directly proportional to the bandwidth

47. Pick up the correct statement from the following ?
comments icon0

A. For the same feature, the photograph taken from the satellite vertically above the aircraft, the height displacement is lesser than 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. All of the above
48. Which one of the following residual biases involves the GPS accuracy ?
comments icon0

A. Satellite dependent biases due to uncertainty in the orbital parameters of the satellite

B. Receiver -dependent biases due to clock stability with line

C. All the above

D. Signal propagation biases due to the sphere and troposphere propagation

49. A passive sensor uses ________________?
comments icon0

A. Flash light as a source of energ

B. Its own source of energy

C. Sun as the source of energy

D. None of these