Civil engineering study desk with a bridge model, surveying instrument and construction materials

Focused topic practice

elements of remote sensing MCQs

Practise focused elements of remote sensing questions with marked answers for exam preparation and subject revision.

elements of remote sensing Mcqs
1. 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____________________?
comments icon0
A. Active remote sensing

B. None of these

C. Passive remote sensing

D. Neutral remote sensing

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
3. 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___________________?
comments icon0

A. Fresnel refraction

B. Fresnel reflection

C. None of these

D. Snells law

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

12. The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from__________________?
comments icon0
A. 10-10 to 106 m
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

15. The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called________________?
comments icon0
A. Albedo

B. None of these

C. Reflectance

D. Reflectance factor

16. Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena________________?
comments icon0

A. Vegetative cover

B. Snow cover

C. All of these

D. Cloud evolution

17. If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by___________________?
comments icon0
A. Cm

B. Cm

C. Cm = 1/

D. None of these

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
19. sensor IFOV is proportional to_________________?
comments icon0

A. cos2

B. tan2

C. sin2

D. sec2
20. The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is_______________?
comments icon0
A. 24

B. 12

C. 16

D. 8