GATE Geomatics Engineering Practice Quiz

Question 1

In active microwave remote sensing, why can a radar system acquire data during both day and night?

Accepted Answer

Because the sensor provides its own electromagnetic illumination

Question 2

Which statement best explains why microwave remote sensing is often preferred over optical sensing under cloudy conditions?

Accepted Answer

Microwave wavelengths can penetrate clouds much better than visible wavelengths

Question 3

For a pulse radar, improving range resolution most directly requires

Accepted Answer

increasing signal bandwidth

Question 4

A radar target shows strong return in HH and VV channels but very weak return in HV. The dominant scattering mechanism is most likely

Accepted Answer

single-bounce surface scattering from a relatively smooth target

Question 5

For a smooth water surface observed by a microwave radar at moderate incidence angle, the backscatter is typically low mainly because of

Accepted Answer

specular reflection directing most energy away from the radar

GATE Geomatics Engineering