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70+ Elements of Remote Sensing Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .

51.

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)
52.

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°
53.

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
54.

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
55.

Electromagnetic radiation:

A. produces a time varying magnetic field and vice versa
B. once generated, remains self-propagating
C. is capable to travel across space
D. all of these
Answer» D. all of these
56.

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

A. satellite dependent biases due to uncertainty in the orbital parameters of the satellite
B. receiver-dependent biases due to clock stability with line
C. signal propagation biases due to the sphere and troposphere propagation
D. all the above
Answer» D. all the above
57.

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» A. height displacement of a will be less than that of b
58.

The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is:

A. 8
B. 12
C. 16
D. 24
Answer» D. 24
59.

Pick up the important characteristic of a target which facilitates its identification from the following:

A. spectral variation
B. spatial variation
C. temporal variation
D. all of these
Answer» D. all of these
60.

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» A. the frequency
61.

Which one of the following geometric errors of satellite sensors is random?

A. scan skew
B. panoramic distortion
C. earth rotation
D. altitude variation
Answer» D. altitude variation
62.

Pick up the correct statement from the following:

A. the first man-made satellite, sputnik-l\ was launched on 4th october, 1957
B. the united state\s explorer 6 transmitted the first picture of the earth in august 1959
C. television infrared observation satellite (tiros) designed for meteorological observations, started systematic earth observations from space from 1, april, 1960
D. all of these
Answer» D. all of these
63.

Which one of the following frequency regions is a part of sun's radiation?

A. ultraviolet frequency region
B. infrared frequency region
C. radio frequency region
D. all of these
Answer» D. all of these
64.

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
Answer» B. atmospheric window
65.

Which on speed (C) of the electromagnetic wave is correct?

A. c = v
B. c = /v
C. c = v
D. c = 1/
Answer» C. c = v
66.

In GPS, receivers used are;

A. electronic clocks
B. atomic clocks
C. quartz clocks
D. mechanical clocks
Answer» C. quartz clocks
67.

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
Answer» B. 230 km
68.

Which one of the following attributes is not associated with digital maps

A. colour
B. symbology
C. legends
D. south arrow
Answer» D. south arrow
69.

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

A. sensors
B. passive sensors
C. active sensors
D. none of these
Answer» C. active sensors
70.

The most widely used antenna in GPS is

A. parabolic antenna
B. microstrip antenna
C. horn antenna
D. slotted antenna
Answer» B. microstrip antenna
71.

Orbital radius of GPS satellites is approximately:

A. 15,200 km
B. 26,600 km
C. 18,400 km
D. 36,000 km
Answer» B. 26,600 km
72.

If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by:

A. cm = 1/
B. cm
C. cm
D. none of these
Answer» B. cm
73.

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
Answer» A. reduces the contrast of the image and also its sharpness
74.

Pick up the correct statement from the following

A. the ratio of the up flux and down flux just above the snow surface, is called albedo
B. spectral albedo of snow is calculated for the semi-infinite snow thickness
C. water equivalent height of snow is the height of water column obtained by melting snow
D. all of these
Answer» D. all of these
75.

Spatial variation in horizontal and vertical directions is caused due to:

A. physical weathering of rocks
B. chemical weathering of rocks
C. biological weathering of rocks
D. all of these
Answer» D. all of these
76.

The basic requirement of any sensor system is:

A. radiometric resolution
B. spatial resolution
C. spectral resolution
D. all of these
Answer» D. all of these
77.

A passive sensor uses:

A. sun as the source of energy
B. flash light as a source of energy
C. its own source of energy
D. none of these
Answer» A. sun as the source of energy
78.

Who coined the term, 'Remote sensing'.

A. evelyn l. pruitt, a geographer
B. gaspard felix tournachon, a french scientist
C. wilbur wright, an italian scientist
D. none of these
Answer» A. evelyn l. pruitt, a geographer

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