Elements of Remote Sensing

70. Which one of the following quantities forms the basis of radiometry?

1. Radiant energy (Q)
2. Radiant flux ( )
3. Radiant intensity (I)
4. All of these

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71. Which one of the following relationship between the wave length (λ), and frequency and the speed (C) of the electromagnetic wave is correct?

1. C = v + λ
2. C = λ/v
3. C = vλ
4. C = 1/λv

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72. Which one of the following residual biases involves the GPS accuracy?

1. Satellite dependent biases due to uncertainty in the orbital parameters of the satellite
2. Receiver-dependent biases due to clock stability with line
3. Signal propagation biases due to the sphere and troposphere propagation
4. All the above

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73. Which one of the following statement is correct?

1. Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
2. The rate of transfer of radiant energy is called flux and is expressed in watts
3. The radiant energy which falls upon a surface is termed as irradiance
4. All of these

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74. Which one of the following statement is incorrect regarding the electromagnetic radiation?

1. These are produced by the motion of electric charge
2. The oscillation of charged particles sets up changing electric fields
3. The changing electric fields induce the changing magnetic fields in the surrounding medium
4. None of these

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75. Which one of the following statements is correct regarding the GPS satellites?

1. The nominal altitude is about 20,200 km
2. The inclination of axis satellite is 55°
3. The satellite transmits two L band signals (L₁ with 1575.42 MHz and L₂ with 1276.6 MHz)
4. All of these

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76. Which one of the following statements is correct?

1. During the day, earth reflects solar radiation
2. During the day, earth reflects both solar radiations the emission from its surface
3. During the night, earth emits radiation from its surface
4. All of these

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77. Which one of the following statements regarding remote sensing is correct?

1. The interaction of the electromagnetic radiation with the target
2. The emission of electromagnetic radiation from the target
3. Both (a) and (b)
4. Neither (a) nor (b)

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78. Which one the following is a correct statement?

1. The vertical section of the soil extending into the parent material, is called profile
2. The layers of the soil parallel to the earth surface are called horizons
3. The transitional layer between two adjoining horizons is called boundary
4. All of these

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79. While propagating through homogeneous, isotropic media,

1. Directions of both the fields are orthogonal
2. Both the fields are at right angles to the direction of propagation
3. Both (a) and (b)
4. Neither (a) nor (b)

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80. Who coined the term, 'Remote sensing'.

1. Evelyn L. Pruitt, a geographer
2. Gaspard Felix Tournachon, a French scientist
3. Wilbur Wright, an Italian scientist
4. None of these

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