Practice test

Remote sensing and gis - Test Set 3

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    What is the role of ground control points (GCPs) in remote sensing?
    1. To provide reference locations for georeferencing
    2. To enhance image quality
    3. To track satellite movement Answer
    4. To measure atmospheric conditions
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  2. Question 2

    Which technology is commonly used in precision agriculture?
    1. Manual soil sampling
    2. Crop rotation
    3. Traditional farming methods
    4. Remote sensing
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  3. Question 3

    What is the main application of thermal remote sensing?
    1. Detecting vegetation types
    2. Monitoring soil moisture
    3. Measuring land surface temperature
    4. Analyzing air quality
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  4. Question 4

    What does ‘image enhancement’ in remote sensing involve?
    1. Increasing the spatial resolution of an image
    2. Improving the visual quality of images for better interpretation
    3. Adding additional data layers
    4. Changing the sensor calibration Answer
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  5. Question 5

    Pick up the correct statement from the following:
    1. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
    2. Topological characteristics of an object are independent of scale measurement
    3. The three elements of topology are adjacency, containment, and connectivity
    4. All of these
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  6. Question 6

    Coherence of two electromagnetic waves takes place if their phase difference is:
    1. Constant in time
    2. Constant in time and space
    3. Constant in space
    4. None of these
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  7. Question 7

    Which one of the following parameters is considered to determine the reflectance of a vegetation canopy?
    1. Solar zenith angle
    2. Azimuth angle
    3. Look angle
    4. All of these
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  8. Question 8

    Which one of the following errors is produced by platform characteristics of the sensor?
    1. Altitude
    2. Altitude variation
    3. Orbit drift
    4. All of above
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  9. Question 9

    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 :
    1. h = dp/(H/B)
    2. h = (B/H) dp
    3. h = dp/(B/H)
    4. h = (H/B) dp
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  10. Question 10

    Pick up the important characteristic of a target which facilitates its identification from the following:
    1. Spectral variation
    2. Temporal variation
    3. Spatial variation
    4. All of these
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  11. Question 11

    Which one of the following geometric errors of satellite sensors is random?
    1. Scan skew
    2. Panoramic distortion
    3. Earth rotation
    4. Altitude variation
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  12. Question 12

    Which one of the following frequency regions is a part of sun’s radiation?
    1. Ultraviolet frequency region
    2. Infrared frequency region
    3. Radio frequency region
    4. All of these
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  13. Question 13

    In GPS, receivers used are;
    1. Electronic clocks
    2. Atomic clocks
    3. Quartz clocks
    4. Mechanical clocks
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  14. Question 14

    The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as:
    1. Ozone hole
    2. Atmospheric window
    3. Ozone window
    4. Black hole
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  15. Question 15

    Which one of the following attributes is not associated with digital maps:
    1. Colour
    2. Symbology
    3. South arrow
    4. Legends
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  16. Question 16

    “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:
    1. Fresnel refraction
    2. Snell’s law
    3. Fresnel reflection
    4. None of these
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  17. Question 17

    A passive sensor uses:
    1. Flash light as a source of energy
    2. Its own source of energy
    3. Sun as the source of energy
    4. All of the above
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  18. Question 18

    Who coined the term, ‘Remote sensing’.
    1. Wilbur Wright, an Italian scientist
    2. Gaspard Felix Tournachon, a French scientist
    3. Evelyn L. Pruitt, a geographer
    4. None of these
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  19. Question 19

    In case of reflection and refraction of electromagnetic radiation,
    1. Angle of refraction = sum of the angles of incidence and refraction
    2. Angle of incidence = angle of refraction
    3. Angle of incidence = angle of reflection
    4. None
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  20. Question 20

    Which one of the following factors does not affect the scale of the air photographs?
    1. Focal length
    2. Ground elevation
    3. Flying height
    4. None of these
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