Elements of Remote Sensing - Section 1 (3)

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Elements of Remote Sensing - Section 1

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17.

Which one of the following parameters is accurate for DGPS.

A.	Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
B.	Positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station
C.	Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
D.	Positional accuracies ~ 5 - 10 m if rover is less than 25 km

Answer: Option A

Explanation:

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18.

Remote sensing techniques makes use of the properties of-----emitted, reflected or diffracted by the sensed objects:

A.	electric waves
B.	soundwaves
C.	electromagnetic waves
D.	wind waves

Answer: Option C

Explanation:

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19.

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?

A.	Height displacement of A will be less than that of B
B.	Height displacement of B will be less than that of A
C.	Height displacement of A and B is equal
D.	Height displacement of A and B will be towards each other

Answer: Option A

Explanation:

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20.

Pick up the correct statement from the following:

A.	Phase of a wave is expressed as a fraction of a period with respect to a refrence
B.	Phase is usually specified by angular measure with one period being 360°
C.	The reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction.
D.	All of these

Answer: Option D

Explanation:

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21.

Pick up the correct statement from the following :

A.	When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed.
B.	When the electric vector is in the plane of incidence, vertical polarisation is formed.
C.	When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed.
D.	The plane containing the incident ray and normal to the reflecting surface at the point of incidence is called the plane of incidence.
E.	All of these

Answer: Option E

Explanation:

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22.

A perfectly black body :

A.	is a diffuse emitter
B.	absorbs all the radiations of every wave lengths
C.	emits power of every wave length
D.	All the above

Answer: Option D

Explanation:

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23.

The phase difference of the waves 1 and 2 at A in the given figure is :

15-27-60

A.	π/4
B.	π/2
C.	π
D.	3π/2

Answer: Option B

Explanation:

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24.

The value of energy quantum for radiation of any frequency is proportional to :

A.	the frequency
B.	the reciprocal of the energy
C.	the square of the frequency
D.	the square root of the frequency

Answer: Option A

Explanation:

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Elements of Remote Sensing - Section 1 (3)

Elements of Remote Sensing - Section 1

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