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 Previous Year Question Papers