ELEMENTS OF REMOTE SENSING QUIZ

Which one of the following factors does not affect the scale of the air photographs?

None of these

Focal length

Flying height

Ground elevation

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The reflectance from a surface is called specular reflection if it follows:

All of these

Lambert

Planktan

Snell’s law

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

Radiant intensity (I)

Radiant energy (Q)

Radiant flux (φ)

All of these

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‘A’ and ‘B’ are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?

Height displacement of A and B will be towards each other

Height displacement of B will be less than that of A

Height displacement of A and B is equal

Height displacement of A will be less than that of B

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The most widely used antenna in GPS is

Microstrip antenna

Horn antenna

Parabolic antenna

Slotted antenna

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In GPS, receivers are used are;

Quartz clocks

Electronic clocks

Mechanical clocks

Atomic clocks

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Sensor IFOV is proportional to:

cos²

sec²

sin²

tan²

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

None of these

Spectral variation

Temporal variation

Spatial variation

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Electromagnetic radiation:

Produces a time varying magnetic field and vice versa

All of these

Is capable to travel across space

Once generated, remains self-propagating

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

2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm

All of these

4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm

0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm

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