Elements of Remote Sensing

21: The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths :

A. 0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6`mu` m

B. 2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 `mu`m

C. 4.2 to 5.0, 7.0 to 15.0 `mu`m and 1 cm to 30 cm

D. All of these

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

A. `h > lambda // Delta cos theta`

B. `h = lambda // 8 cos theta`

C. `h > lambda // 8 cos theta`

D. `h < lambda // 8 cos theta`

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23: If 0 is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to :

A. `sin^2 theta`

B. `cos^2 theta`

C. `sec^2 theta`

D. `tan^2 theta`

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24: Assuming n as the frequency of radiation, n₀ as the threshold frequency and k as a constant, the energy of the photo-electrons (E) is related as

A. E = k (n - n₀)

B. E = k (n + n₀)

C. E = k (n x n₀)

D. E = `frac(k)(2)` (n+n₀)

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25

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

A. The nominal altitude is about 20, 200 km

B. The inclination of axis satellite is 55Â°

C. The satellite transmits two L band signals (L₁ with 1575.42 MHz and L₂ with 1276.6 MHz)

D. All of these

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