# Remote Sensing MCQs | Remote Sensing Multiple Choice Questions and Answers

Questions
1 Pick up the correct statement from the following:
A Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
B Topological characteristics of an object are independent of scale measurement
C The three elements of topology are adjacency, containment, and connectivity
D All of these

2 Pick up the correct statement from the following:
A In remote sensing technique, the observation place, is called a platform
B Platforms may be either stationary or mobile
C Spatial resolution of the imaging system becomes poorer with increase of platform height
D All of these

3 Coherence of two electromagnetic waves takes place if their phase difference is:
A Constant in time
B Constant in space
C Constant in time and space
D None of these

Answer: Constant in time and space
4 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 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

5 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

6 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

7 Leaf reflectance depends primarily on:
A The pigments
B Internal cell structure
C Equivalent water content
D All of these

8 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

9 DGPS is based on the concept that bias 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

10 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: Height displacement of A will be less than that of B
11 The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:
A 10-10 to 106 m
B 10-8 to 106 m
C 10-10 to 1010 m
D 10-8 to 108 m

12 Pick up the important characteristic of a target which facilitates its identification from the following:
A Spectral variation
B Spatial variation
C Temporal variation
D All of these

13 Which one of the following statements is correct?
A The function of an information system is to improve one s 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

14 Which one of the following geometric errors of satellite sensors is random?
A Scan skew
B Panoramic distortion
C Earth rotation
D Altitude variation

15 Pick up the correct statement from the following:
A The first man-made satellite, Sputnik-l’ 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 All of these

16 Which one of the following frequency regions is a part of sun’s radiation?
A Ultraviolet frequency region
B Infrared frequency region
D All of these

17 The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as:
A Ozone hole
B Atmospheric window
C Ozone window
D Black hole

18 In GPS, receivers used are;
A Electronic clocks
B Atomic clocks
C Quartz clocks
D Mechanical clocks

19 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