ELEMENTS OF REMOTE SENSING QUIZ

DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within

75 km

50 km

100 km

25 km

TRUE ANSWER : ?
YOUR ANSWER : ?

Electromagnetic radiation:

Is capable to travel across space

Once generated, remains self-propagating

Produces a time varying magnetic field and vice versa

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of reflection and refraction of electromagnetic radiation,

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

All listed here

Angle of incidence = angle of reflection

Angle of incidence = angle of refraction

TRUE ANSWER : ?
YOUR ANSWER : ?

Due to scan geometry of a satellite sensor:

All of these

The ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir

The details towards the edge of the scan get compressed

The off-nadir resolution is degraded

TRUE ANSWER : ?
YOUR ANSWER : ?

The object of photo-interpretation is:

Judging the significance of objects

All of these

Identification

Recognition of objects

TRUE ANSWER : ?
YOUR ANSWER : ?

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:

None of these

Cm = 1/εμ

Cm = 1/√8 μ

Cm = 5/√εμ

TRUE ANSWER : ?
YOUR ANSWER : ?

According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on another medium (refractive index m₂);

Both (A) and (B)

The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi

The angle of incidence is equal to the angle of refraction

Neither (A) nor (B)

TRUE ANSWER : ?
YOUR ANSWER : ?

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

1, 2, 3

1, 2

1, 3

2, 3

TRUE ANSWER : ?
YOUR ANSWER : ?

‘A’ and ‘B’ are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?

Height displacement of B will be less than that of A

Height displacement of A and B will be towards each other

Height displacement of A will be less than that of B

Height displacement of A and B is equal

TRUE ANSWER : ?
YOUR ANSWER : ?

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

h > λ/Δ cos θ

h = λ/8 cos θ

h > λ/8 cos θ

h < λ/8 cos θ

TRUE ANSWER : ?
YOUR ANSWER : ?