# Elements of Remote Sensing MCQ with Answers – Set 04

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## Q1. Which one of the following helps to identify the objects on the earth surface?

(A) Atmospheric window
(B) Signature
(D) None of these

(A) π/4
(B) π/2
(C) π
(D) 3π/2

## Q3. Leaf reflectance depends primarily on:

(A) The pigments
(B) Internal cell structure
(C) Equivalent water content
(D) All of these

Answer: (D) All of these

## Q4. 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 reference
(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:(D) All of these

## Q5. The various stages occuring in GPS system are described below:1. Generation of an output to the user2. Detection of the GPS signals3. Processing the data in the built-in-computer4. Decoding the GPS signal.The correct sequence of the stages is:

(A) 1, 2, 3, 4
(B) 2, 3, 4, 1
(C) 2, 4, 3, 1
(D) 3, 1, 2, 4

Answer: (C) 2, 4, 3, 1

## Q6. 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

(A) h = dp/(B/H)
(B) h = (B/H) dp
(C) h = dp/(H/B)
(D) h = (H/B) dp

Answer: (A) h = dp/(B/H)

## Q7. The reflection of solar energy is characterized by the water content in the leaf, in the reflective optical infrared:

(A) Visible (0.4 – 0.7 μm) region
(B) Near-IR (0.7 – 1.3 μm) region
(C) Short wave-IR (1.3 – 2.7 μm) region
(D) None of these

Answer: (C) Short wave-IR (1.3 – 2.7 μm) region

## Q8. The normal altitude of GPS satellite is about

(A) 16,200 km
(B) 20,200 km
(C) 24,400 km
(D) 36,100 km

Answer: (B) 20,200 km

## Q9. Critical angle of electromagnetic radiation takes place if

(A) Angle of incidence is equal to angle of refraction
(B) Angle of incidence is greater than the angle of refraction
(C) Angle of incidence is equal to 90°
(D) Angle of refraction is equal to 90°

Answer: (D) Angle of refraction is equal to 90°

## Q10. 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:

(A) Passive remote sensing
(B) Active remote sensing
(C) Neutral remote sensing
(D) None of these

Answer: (B) Active remote sensing

## Q11. Geodimeter is based on:

(A) Propagation of modulated light waves
(B) Propagation of infrared radiation
(C) The visible light as carrier with frequency of the order of 5 × 1014 Hz
(D) High frequency radio waves

Answer: (A) Propagation of modulated light waves

## Q12. Earth observations from a satellite platform provide:

(A) Synoptic view of a large area
(B) Constant solar zenith angles and similar illumination conditions
(C) Repetitive observations of the same area with intervals of a few minutes to a few weeks
(D) All of these

Answer: (D) All of these

## Q13. For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is:

(A) Circular orbit
(B) Sun-synchronous orbit
(C) Near polar orbit
(D) None of these

Answer: (B) Sun-synchronous orbit

## Q14. The code based GPS receivers are generally used for:

(A) Vehicle tracking
(C) Trans movement
(D) All of these

Answer: (D) All of these

## Q15. 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

(A) 25 km
(B) 50 km
(C) 75 km
(D) 100 km

Answer: (D) 100 km

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