Elements of Remote Sensing

41. The code based GPS receivers are generally used for:

1. Vehicle tracking
2. Land navigation
3. Trans movement
4. All of these

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42. The coherence length over which there is a strong relationship between amplitudes is;

1. Directly proportional to the bandwidth
2. Inversely proportional to the bandwidth
3. The square of the bandwidth
4. None of these

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43. The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

1. 10^-10 to 10⁶ m
2. 10^-8 to 10⁶ m
3. 10^-10 to 10¹⁰ m
4. 10^-8 to 10⁸ m

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44. The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is:

1. 8
2. 12
3. 16
4. 24

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45. The infrared portion of EMR lies between

1. 0.4 - 0.7 μm
2. 0.5 mm to 1 μm
3. 0.7 - 1.3 μm
4. 0.7 to 14 μm

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46. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:

1. Sensors
2. Passive sensors
3. Active sensors
4. None of these

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47. 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:

1. Passive remote sensing
2. Active remote sensing
3. Neutral remote sensing
4. None of these

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48. The maximum sun's radiation occurs around:

1. 0.4 μm wave length
2. 0.55 μ wave length
3. 0.7 μ wave length
4. None of these

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49. The most widely used antenna in GPS is

1. Parabolic antenna
2. Microstrip antenna
3. Horn antenna
4. Slotted antenna

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50. The normal altitude of GPS satellite is about

1. 16,200 km
2. 20,200 km
3. 24,400 km
4. 36,100 km

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