Elements of Remote Sensing MCQs

Question 1

Which one of the following relationship between the wave length (X), and frequency and the speed (C) of the electromagnetic wave is correct ?

Accepted Answer

C = v X

Answer

C = v + X

Answer

C=v-X

Answer

C = v 1

Question 2

For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length lcoh is:

Accepted Answer

230 km

Answer

130 km

Answer

250 km

Answer

500 km

Question 3

Polarising angle (i) and refractive index (g) of the reflecting surface are related by:

Accepted Answer

tan i = p,

Answer

sin i =

Answer

cos i =

Answer

tan i =

Question 4

The emission of electrons from a metal plate exposed to light depends on the :

Accepted Answer

both (a) and (b)

Answer

intensity of the light

Answer

frequency of light

Answer

neither (a) nor (b)

Question 5

Assuming n as the frequency of radiation, no as the threshold frequency and k as a constant, the energy of the photo-electrons (E) is related as

Accepted Answer

E = k (n - no)

Answer

E = k (n + no)

Answer

E = k (a x no)

Answer

E = (n. + no)

Question 6

Which one of the following can travel through empty space :

Accepted Answer

electromagnetic waves

Answer

sound waves

Answer

water waves

Answer

spring waves

Question 7

'A time varying magnetic field produces an electric field'. This phenomenon is known as

Accepted Answer

Faraday's law

Answer

Newton's law

Answer

Kirchoff law

Answer

Ampere Maxwell law

Question 8

'A time varrying electric field produces a magnetic field.' This phenemenon is called:

Accepted Answer

Ampere Maxwell's law

Answer

Hertz's law

Answer

Faraday's law

Answer

Kirchoffs law

Question 9

The reflection of solar energy is characterised by the water content in the leaf, in the reflective optical infrared :

Accepted Answer

visible (0.4 ? 0.7 gm) region

Answer

near-IR (0.7 ? 1.3 gm) region

Answer

short wave-IR (1.3 ?2.7 gm) region

Answer

None of these