elements of remote sensing MCQs – Page 2

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

elements of remote sensing Mcqs
21. For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is_____________?
comments icon0

A. 250 km

B. 500 km

C. 130 km

D. 230 km
22. The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called_________________?
comments icon0

A. Temporal variation

B. None of these

C. Spectral variation

D. Spatial variation
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

24. 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___________________?
comments icon0

A. h = (B/H) dp

B. h = (H/B) dp

C. h = dp/(H/B)

D. h = dp/(B/H)
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

27. 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___________________?
comments icon0

A. 50 km

B. 75 km

C. 25 km

D. 100 km
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

32. Which one of the following errors is produced by platform characteristics of the sensor ?
comments icon0
A. All of these

B. Altitude variation

C. Altitude

D. Orbit drift

33. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called________________?
comments icon0

A. None of these

B. Passive sensors

C. Active sensors

D. Sensors

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