ELEMENTS OF REMOTE SENSING QUIZ

If electric permittivity and magnetic permeability of the medium are respectively ‘ε’ and ‘μ’, then the velocity (Cm) of the electromagnetic wave in the medium is given by:

Cm = 5/√εμ

Cm = 1/εμ

None of these

Cm = 1/√8 μ

TRUE ANSWER : ?
YOUR ANSWER : ?

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

None of these

Spectral variation

Temporal variation

Spatial variation

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

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

The nominal altitude is about 20,200 km

The inclination of axis satellite is 55°

All of these

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A passive sensor uses:

None of these

Its own source of energy

Flash light as a source of energy

Sun as the source of energy

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Consider the following statements regarding the satellite imaging: 1. The satellite orbit is fixed in the inertial space 2. During successive across-track imaging, the earth rotates beneath the sensor 3. The satellite images a skewed areaWhich one of the following statements is/are correct?

1, 2, 3

1, 2

2, 3

1, 3

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In case of reflection and refraction of electromagnetic radiation,

All listed here

Angle of refraction = sum of the angles of incidence and refraction

Angle of incidence = angle of reflection

Angle of incidence = angle of refraction

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The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as:

Black hole

Ozone window

Atmospheric window

Ozone hole

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Which one of the following helps to identify the objects on the earth surface?

Signature

Atmospheric window

Radiometric error

None of these

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Leaf reflectance depends primarily on:

Equivalent water content

Internal cell structure

The pigments

All of these

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YOUR ANSWER : ?

Orbital radius of GPS satellites is approximately:

36,000 km

26,600 km

18,400 km

15,200 km

TRUE ANSWER : ?
YOUR ANSWER : ?

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