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Elements of Remote Sensing MCQ Questions & Answers

Elements of Remote Sensing MCQs : This section focuses on the "Elements of Remote Sensing". These Multiple Choice Questions (MCQs) should be practiced to improve the Elements of Remote Sensing skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

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

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Question 2

Leaf reflactance depends primarily on :

A. the pigments
B. internal cell structure
C. equivalent water content
D. All of these

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Question 3

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

A. 0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm
B. 2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm
C. 4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm
D. All of these

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Question 4

The various stages occuring in GPS system are described below :1. Generation of an output to the user2. Detection of the GPS signal3. 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

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Question 5

The refractive index of the ocean water:

A. increases with salinity
B. increases with temperature
C. decreases with salinity
D. decreases with temperature

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Question 6

"An Electromagnetic wave falls on to a boundary between two loss less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as :

A. Fresnel reflection
B. Fresnel refraction
C. Snell's law
D. None of these

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Question 7

Pick up the correct definition from the following with response to GIS.

A. Common boundry between two areas of a locality is known as adjacency.
B. The area features which are wholly contained within another area feature, is known so containment.
C. The geometric property which describes the linkage between line features is defined as connectivity.
D. All of these.

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Question 8

Which one of the following statements is correct?

A. During the day, earth reflects solar radiation
B. During the day earth reflects both solar radiation the emission from its surface
C. During the night, earth emits radiation from its surface
D. All of these

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Question 9

The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called :

A. spectral variation
B. spatial variation
C. temporal variation
D. None of these .

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Question 10

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

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Question 11

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

A. h > λ/Δ cos θ
B. h = λ/8 cos θ
C. h > λ/8 cos θ
D. h < λ/8 cos θ

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Question 12

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

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Question 13

The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called :

A. sensonrs
B. passive sensors
C. active sensors
D. None of these

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Question 14

Which one of the following statements regarding remote sensing is correct.

A. The interaction of the electromagnetic radiation with the target
B. The emission of electromagnetic radiation from the target
C. both (a) and (b)
D. Neither (a) nor (b)

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Question 15

The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as:

A. ozone hole
B. atmospheric window
C. ozone window
D. black hole

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Question 16

The most widely used antenna in GPS is

A. Parabolid antenna
B. Microstrip antenna
C. Horn antenna
D. Slotted antenna

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Question 17

A reduction of nitrogen nutrient in plants :

A. affects leaf colour
B. reduces pigment concentration
C. increase the visible reflectivity
D. All of these

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Question 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

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Question 19

Due to pertubation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

A. six ground stations
B. five ground stations
C. four ground stations
D. three ground stations

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Question 20

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

A. atmospheric window
B. signature
C. radiometric error
D. None of these

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Question 21

If 0 is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to :

A. sin2θ
B. cos2θ
C. sec2θ
D. tan2θ

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Question 22

Pick up the correct statement from the following:

A. The surface defined by the locus of points having same phase, is called a wave front.
B. The wave whose surface of constant phase are parallel planes, is known as a plane wave.
C. The relative phase difference between the waves is important and not the absolute phase of a point on the wave
D. All of these

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Question 23

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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Question 24

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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Question 25

Which one of the following statements is correct ?

A. Snow albedo falls at all wave length with the increase of grain size
B. The effect of grain size on reflection is maximum in the near-IR region
C. The effect of grain size on reflection is low in the visible region of the spectrum
D. All of these

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Question 26

Pick up the correct statement from the following :

A. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
B. Topological characteristics of an object are independent of scale measurement
C. The three elements of topology are adjacency, containment, and connectivity
D. All of these

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Question 27

Which one the following is a correct statement?

A. The vertical section of the soil extending into the parent material, is called profile
B. The layers of the soil parallel to the earth surface, are called horizons.
C. The transitional layer between two adjoining horizons, is called boundary.
D. All of these

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Question 28

The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

A. reduces the contrast of the image and also its sharpness
B. increases the contrast of the image but reduces the sharpness
C. increases both the contrast and sharpness
D. reduces the contrast but increases the sharpness

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Question 29

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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Question 30

Which one of the following residual biases involves the GPS accuracy ?

A. Satellite dependent baises due to uncertainty in the orbital parameters of the satellite.
B. Receiver-depandent biases due to clock stability with line
C. Signal propagation baises due to the sphere and troposphere propogation.
D. All the above

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Question 31

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

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Question 32

Pick up the correct statement from the following:

A. Indian space effort started in 1962 with the establishment of a rocket.
B. Development of space (DOS) was established by the Government of India in 1972
C. Indian Space Research Organisation (ISRO) is responsible for the space technology and its application to various activities.
D. All of these

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Question 33

The reflection of solar energy is characterised 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

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Question 34

Coherence of two electromagnetic waves takes place if their phase difference is :

A. constant in time
B. constant in space
C. constant in time and space
D. None of these

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Question 35

The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

A. 10-10 to 106 m
B. 10-8 to 106 m
C. 10-10 to 1010 m
D. 10-8 to 108 m

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