Elements of Remote Sensing Objective Questions and Answers - Set 01

Practice Test: Question Set - 01

1. 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

2. Pick up the correct statement from the following:
    (A) Indian space effort started in 1962 with the establishment of a rocket
    (B) Development of space (DOS) was established by the Government of India in 1972
    (C) Indian Space Research Organization (ISRO) is responsible for the space technology and its application to various activities
    (D) All of these

3. 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

4. The coherence length over which there is a strong relationship between amplitudes is;
    (A) Directly proportional to the bandwidth
    (B) Inversely proportional to the bandwidth
    (C) The square of the bandwidth
    (D) None of these

5. The reflectance from a surface is called specular reflection if it follows:
    (A) Snell’s law
    (B) Lambert's cosine law
    (C) Planktan's law
    (D) All of these

6. Pick up the correct statement from the following:
    (A) A graphical representation of spectral reflectance verses the various growth stages of a crop, depicts a phonologic pattern
    (B) The changes in the polarization of the radiation reflected or emitted by an object, is known as polarization variation
    (C) The degree of polarization is a characteristic of the object which helps in the identification of the object
    (D) All of these

7. Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena:
    (A) Cloud evolution
    (B) Vegetative cover
    (C) Snow cover
    (D) All of these

8. 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

9. A perfectly black body:
    (A) Is a diffuse emitter
    (B) Absorbs all the radiations of every wave lengths
    (C) Emits power of every wave length
    (D) All the above

10. If θ is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to:
    (A) sin2θ
    (B) cos2θ
    (C) sec2θ
    (D) tan2θ

11. Which one the following is a correct statement?
    (A) The vertical section of the soil extending into the parent material, is called profile
    (B) The layers of the soil parallel to the earth surface are called horizons
    (C) The transitional layer between two adjoining horizons is called boundary
    (D) All of these

12. In case of reflection and refraction of electromagnetic radiation,
    (A) Angle of incidence = angle of refraction
    (B) Angle of incidence = angle of reflection
    (C) Angle of refraction = sum of the angles of incidence and refraction
    (D) All the above

13. Pick up the correct statement from the following:
    (A) The minimum frequency of light for which no electrons are emitted, is called threshold frequency
    (B) Polarising angle of glass is 57.5°
    (C) At the polarising angle, the reflected and refracted rays are orthogonal
    (D) All the above

14. Which one of the following factors does not affect the scale of the air photographs?
    (A) Focal length
    (B) Flying height
    (C) Ground elevation
    (D) None of these

15. Which one of the following statements regarding remote sensing is correct?
    (A) The interaction of the electromagnetic radiation with the target
    (B) The emission of electromagnetic radiation from the target
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

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