Elements of Remote Sensing

31. Pick up the important characteristic of a target which facilitates its identification from the following:

1. Spectral variation
2. Spatial variation
3. Temporal variation
4. All of these

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32. Rayleigh's criterion for a rough surface is: (where letters carry their usual meanings).

1. h>λ/Δcosθ
2. h=λ/8 cosθ
3. h>λ/8 cosθ
4. h<λ/8 cosθ

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

1. Electric waves
2. Sound waves
3. Electromagnetic waves
4. Wind waves

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34. Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena:

1. Cloud evolution
2. Vegetative cover
3. Snow cover
4. All of these

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35. sensor IFOV is proportional to:

1. sin²θ
2. cos²θ
3. sec²θ
4. tan²θ

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36. Spatial variation in horizontal and vertical directions is caused due to:

1. Physical weathering of rocks
2. Chemical weathering of rocks
3. Biological weathering of rocks
4. All of these

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

1. 26,000 km
2. 30,000 km
3. 36,000 km
4. 44,000 km

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38. The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called:

1. Spectral variation
2. Spatial variation
3. Temporal variation
4. None of these

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39. The basic requirement of any sensor system is:

1. Radiometric resolution
2. Spatial resolution
3. Spectral resolution
4. All of these

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

1. Spectral variation
2. Spatial variation
3. Temporal variation
4. None of these

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