Elements of Remote Sensing

21. Geodimeter is based on:

1. Propagation of modulated light waves
2. Propagation of infrared radiation
3. The visible light as carrier with frequency of the order of 5 × 1014 Hz
4. High frequency radio waves

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22. If electric permittivity and magnetic permeability of the medium are respectively '∈' and 'μ' then the velocity (C_m) of the electromagnetic wave in the medium is given by:

1. C_m = 1/∈μ
2. C_m = 1/√8μ
3. C_m =1/√8μ
4. None of these

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23. 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

1. h = dp/(B/H)
2. h = (B/H) dp
3. h = dp/(H/B)
4. h = (H/B) dp

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24. In case of reflection and refraction of electromagnetic radiation,

1. Angle of incidence = angle of refraction
2. Angle of incidence = angle of reflection
3. Angle of refraction = sum of the angles of incidence and refraction
4. All the above

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25. In GPS, receivers used are;

1. Electronic clocks
2. Atomic clocks
3. Quartz clocks
4. Mechanical clocks

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26. Leaf reflectance depends primarily on:

1. The pigments
2. Internal cell structure
3. Equivalent water content
4. All of these

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27. Orbital radius of GPS satellites is approximately:

1. 15,200 km
2. 26,600 km
3. 18,400 km
4. 36,000 km

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28. Pick up the correct definition from the following with response to GIS.

1. Common boundary between two areas of a locality is known as adjacency
2. The area features which are wholly contained within another area feature, is known so containment
3. The geometric property which describes the linkage between line features is defined as connectivity
4. All of these

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29. Pick up the correct statement from the following

1. The ratio of the up flux and down flux just above the snow surface, is called albedo
2. Spectral albedo of snow is calculated for the semi-infinite snow thickness
3. Water equivalent height of snow is the height of water column obtained by melting snow
4. All of these

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30. Pick up the correct statement from the following:

1. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
2. Topological characteristics of an object are independent of scale measurement
3. The three elements of topology are adjacency, containment, and connectivity
4. All of these

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