Elements of Remote Sensing MCQs

Question 1

Geodimeter is based on:

Accepted Answer

Propagation of modulated light waves

Answer

Propagation of infrared radiation

Answer

The visible light as carrier with frequency of the order of 5 × 1014 Hz

Answer

High frequency radio waves

Question 2

If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

Accepted Answer

$${	ext{h}} = \frac{{{	ext{dp}}}}{{\frac{{	ext{B}}}{{	ext{H}}}}}$$

Answer

$${	ext{h}} = \frac{{	ext{B}}}{{	ext{H}}} 	imes {	ext{dp}}$$

Answer

$${	ext{h}} = \frac{{{	ext{dp}}}}{{\frac{{	ext{H}}}{{	ext{B}}}}}$$

Answer

$${	ext{h}} = {	ext{BHbp}}$$

Question 3

In case of reflection and refraction of electromagnetic radiation,

Accepted Answer

Angle of incidence = angle of reflection

Answer

Angle of incidence = angle of refraction

Answer

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

Answer

All the above

Question 4

Electromagnetic radiation:

Accepted Answer

All of these

Answer

Produces a time varying magnetic field and vice versa

Answer

Once generated, remains self-propagating

Answer

Is capable to travel across space

Question 5

Which one of the following statement is incorrect regarding the electromagnetic radiation?

Accepted Answer

None of these

Answer

These are produced by the motion of electric charge

Answer

The oscillation of charged particles sets up changing electric fields

Answer

The changing electric fields induce the changing magnetic fields in the surrounding medium

Question 6

In the given figure the phase of

Accepted Answer

All of these

Answer

Crest A is $$\frac{\pi }{2}$$

Answer

B crossing is $$\pi $$

Answer

Trough C is $$\frac{{3\pi }}{2}$$

Question 7

Which one of the following helps to identify the objects on the earth surface?

Accepted Answer

Signature

Answer

Atmospheric window

Answer

Radiometric error

Answer

None of these

Question 8

The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:

Accepted Answer

Active remote sensing

Answer

Passive remote sensing

Answer

Neutral remote sensing

Answer

None of these

Question 9

The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths:

Accepted Answer

All of these

Answer

0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm

Answer

2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm

Answer

4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm