Elements Of Remote Sensing — Part 1 MCQs with Explanations

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.

None of these is the correct answer to “Which one of the following factors does not affect the scale of the air photographs”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All of these is the correct answer to “The optical property of a water body depends on:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

0.7 to 14 μm is the correct answer to “The infrared portion of EMR lies between”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

$$\frac{\pi }{2}$$ is the correct answer to “The phase difference of the waves 1 and 2 at A in the given figure is:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Both (A) and (B) is the correct answer to “While propagating through homogeneous, isotropic media,”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

sec2θ is the correct answer to “If θ is the angle of scan measured from the nadir, the ground distance swept by the sensor IFOV is proportional to:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

The frequency is the correct answer to “The value of energy quantum for radiation of any frequency is proportional to:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

sec2 is the correct answer to “Sensor IFOV is proportional to:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Reduces the contrast of the image and also its sharpness is the correct answer to “The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All of these is the correct answer to “Pick up the correct definition from the following with response to GIS.”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All of these is the correct answer to “Which one of the following frequency regions is a part of sun's radiation”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Increases with salinity is the correct answer to “The refractive index of the ocean water:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Temporal variation is the correct answer to “The changes in the reflectivity/emissivity with time, is called:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

$${\text{h}} > \frac{\lambda }{8}\cos \theta $$ is the correct answer to “Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

$${\text{C}} = {\text{v}}\lambda $$ is the correct answer to “Which one of the following relationship between the wave length ($$\lambda $$) and frequency and the speed (C) of the electromagnetic wave is correct”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Evelyn L. Pruitt, a geographer is the correct answer to “Who coined the term, ‘Remote sensing’.”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

The angle of refraction ($$\theta {\text{r}}$$) is given by $$\sin {\theta _2} = \frac{{{{\text{n}}_1}}}{{{{\text{n}}_2}}}\sin {\theta _{\text{i}}}$$ is the correct answer to “According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n 1 ) on another medium (refractive index n 2 );”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Microstrip antenna is the correct answer to “The most widely used antenna in GPS is”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Five ground stations is the correct answer to “Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

20,200 km is the correct answer to “The normal altitude of GPS satellite is about”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station is the correct answer to “Which one of the following parameters is accurate for DGPS”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All of these is the correct answer to “Which one of the following errors is produced by platform characteristics of the sensor”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

$${{\text{C}}_{\text{m}}} = \frac{1}{{\sqrt 8 \mu }}$$ is the correct answer to “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:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

36,000 km is the correct answer to “The altitudinal distance of a geostationary satellite from the earth is about:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All of these is the correct answer to “Which one of the following statements is correct regarding the GPS satellites”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

230 km is the correct answer to “For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Electromagnetic waves is the correct answer to “Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All the above is the correct answer to “A perfectly black body:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All of these is the correct answer to “Which one of the following parameters is considered to determine the reflectance of a vegetation canopy”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Inversely proportional to the bandwidth is the correct answer to “The coherence length over which there is a strong relationship between amplitudes is;”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

India is the correct answer to “Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Fresnel reflection is the correct answer to “"An Electromagnetic wave falls on to a boundary between two losses 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:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Altitude variation is the correct answer to “Which one of the following geometric errors of satellite sensors is random”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Quartz clocks is the correct answer to “In GPS, receivers are used are;”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Propagation of modulated light waves is the correct answer to “Geodimeter is based on:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

$${\text{h}} = \frac{{{\text{dp}}}}{{\frac{{\text{B}}}{{\text{H}}}}}$$ is the correct answer to “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”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

Angle of incidence = angle of reflection is the correct answer to “In case of reflection and refraction of electromagnetic radiation,”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

All of these is the correct answer to “Electromagnetic radiation:”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.

None of these is the correct answer to “Which one of the following statement is incorrect regarding the electromagnetic radiation”. This question is standard in competitive examination syllabi for Elements Of Remote Sensing.