Elements of Remote Sensing Objective Type Questions and Answers

21 Pick up the correct statement from the following:

A An increase of phytoplankton decreases the back scattering in the green region

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

C Phytoplankton contains photosynthetically active pigment

D An increase of phytoplankton absorbs the bule region rapidly

View Answer

Answer: An increase of phytoplankton decreases the back scattering in the green region

22 Which one of the following statements is correct?

A During the night, earth emits radiation from its surface

B During the day, earth reflects solar radiation

C During the day, earth reflects both solar radiations the emission from its surface

D All of these

View Answer

Answer: All of these

23 A reduction of nitrogen nutrient in plants:

A Increase the visible reflectivity

B Reduces pigment concentration

C Affects leaf colour

D All of these

View Answer

Answer: All of these

24 Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:

A Electromagnetic waves

B Sound waves

C Electric waves

D None of these

View Answer

Answer: Electromagnetic waves

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

A The changing electric fields induce the changing magnetic fields in the surrounding medium

B The oscillation of charged particles sets up changing electric fields

C These are produced by the motion of electric charge

D None of these

View Answer

Answer: None of these

26 The altitudinal distance of a geostationary satellite from the earth is about:

A 36,000 km

B 30,000 km

C 26,000 km

D 44,000 km

View Answer

Answer: 36,000 km

27 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 Albedo

B Reflectance

C Reflectance factor

D None of these

View Answer

Answer: Albedo

28 Due to scan geometry of a satellite sensor:

A The details towards the edge of the scan get compressed

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 All of these

View Answer

Answer: All of these

29 Pick up the correct statement from the following:

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

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

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

D All of these

View Answer

Answer: All of these

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

A India

B USA

C European Union

D Russia

View Answer

Answer: India

31 The changes in the reflectivity/emissivity with time, is called:

A Temporal variation

B Spectral variation

C Spatial variation

D None of these

View Answer

Answer: Temporal variation

32 Which one of the following statements is correct?

A The effect of grain size on reflection is low in the visible region of the spectrum

B The effect of grain size on reflection is maximum in the near-IR region

C Snow albedo falls at all wave length with the increase of grain size

D All of these

View Answer

Answer: All of these

33 Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

A Five ground stations

B Six ground stations

C Three ground stations

D Four ground stations

View Answer

Answer: Five ground stations

34 Which one of the following helps to identify the objects on the earth surface?

A Signature

B Radiometric error

C Atmospheric window

D None of these

View Answer

Answer: Signature

35 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 Active remote sensing

B Neutral remote sensing

C Passive remote sensing

D None of these

View Answer

Answer: Active remote sensing

36 For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is:

A Sun-synchronous orbit

B Near polar orbit

C Circular orbit

D None of these

View Answer