Elements Of Remote Sensing MCQ Questions & Answers

21

The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called:

A) Reflectance B) Reflectance factor C) Albedo D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

Albedo is the ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body.

It is a measure of how much light that hits a surface is reflected without being absorbed.

This term is commonly used in the fields of astronomy and remote sensing to describe the reflectivity of planets, moons, and other celestial bodies.

22

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 - 5 m if rover is less than 2-5 km 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

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Answer & Solution

Answer: Option A

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23

Which one of the following errors is produced by platform characteristics of the sensor?

A) Altitude variation B) Altitude C) Orbit drift D) All of these

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Answer & Solution

Answer: Option D

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24

If electric permittivity and magnetic permeability of the medium are respectively $$\varepsilon $$ and $$\mu $$, then the velocity (C_m) of the electromagnetic wave in the medium is given by:

A) $${{\text{C}}_{\text{m}}} = \frac{1}{{\varepsilon \mu }}$$ B) $${{\text{C}}_{\text{m}}} = \frac{1}{{\sqrt 8 \mu }}$$ C) $${{\text{C}}_{\text{m}}} = \frac{5}{{\sqrt \varepsilon \mu }}$$ D) None of these

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Answer & Solution

Answer: Option B

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25

The altitudinal distance of a geostationary satellite from the earth is about:

A) 26,000 km B) 30,000 km C) 36,000 km D) 44,000 km

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Answer & Solution

Answer: Option C

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26

Which one of the following statements is correct regarding the GPS satellites?

A) The nominal altitude is about 20,200 km B) The inclination of axis satellite is 55° C) The satellite transmits two L band signals (L₁ with 1575.42 MHz and L₂ with 1276.6 MHz) D) All of these

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Answer & Solution

Answer: Option D

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27

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

A) 130 km B) 230 km C) 250 km D) 500 km

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Answer & Solution

Answer: Option B

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28

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

A) Electric waves B) Sound waves C) Electromagnetic waves D) Wind waves

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Answer & Solution

Answer: Option C

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29

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

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Answer & Solution

Answer: Option D

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30

Which one of the following parameters is considered to determine the reflectance of a vegetation canopy?

A) Solar zenith angle B) Azimuth angle C) Look angle D) All of these

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Answer & Solution

Answer: Option D

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Elements Of Remote Sensing MCQ Questions & Answers | Civil Engineering