11 NOVEMBER 2020 CURRENT AFFAIRS QUIZ

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

h = λ/8 cos θ

h > λ/Δ cos θ

h > λ/8 cos θ

h < λ/8 cos θ

TRUE ANSWER : ?
YOUR ANSWER : ?

Orbital radius of GPS satellites is approximately:

26,600 km

36,000 km

18,400 km

15,200 km

TRUE ANSWER : ?
YOUR ANSWER : ?

The object of photo-interpretation is:

Judging the significance of objects

Recognition of objects

All of these

Identification

TRUE ANSWER : ?
YOUR ANSWER : ?

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

The square of the bandwidth

Inversely proportional to the bandwidth

None of these

Directly proportional to the bandwidth

TRUE ANSWER : ?
YOUR ANSWER : ?

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

16

8

24

12

TRUE ANSWER : ?
YOUR ANSWER : ?

A passive sensor uses:

None of these

Flash light as a source of energy

Sun as the source of energy

Its own source of energy

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Spectral variation

Spatial variation

None of these

Temporal variation

TRUE ANSWER : ?
YOUR ANSWER : ?

Formation of snow occurs if the cloud temperature is

Just above the freezing point

Below the freezing point

At the freezing point

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

None of these

Sensors

Passive sensors

Active sensors

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one of the following parameters is considered to determine the reflectance of a vegetation canopy?

Look angle

Azimuth angle

All of these

Solar zenith angle

TRUE ANSWER : ?
YOUR ANSWER : ?

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