सर्भेक्षण – Surveying MCQ
सर्भेक्षण – सिभिल इन्जिनियरिङ
Surveying · Civil Engineering · १,५६५ प्रश्न
१,५६५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सर्भेक्षण: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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In hydrographic surveying, a graduated pole used for measuring shallow depths is a:
सही उत्तर: क) Sounding rod
Sounding rods are used for shallow water; for greater depths a lead line or echo sounder is used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In adjusting survey observations, the weight assigned to an observation is:
सही उत्तर: क) Inversely proportional to the square of its standard error (variance)
More precise observations get higher weight: weight ∝ 1/σ².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The probable error of a single observation is related to its standard deviation σ by:
सही उत्तर: ख) Probable error = 0.6745 σ
Half of the errors are expected to be smaller than the probable error, which equals 0.6745 times the standard deviation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Triangulated Irregular Network (TIN) represents a terrain surface by:
सही उत्तर: घ) Non-overlapping triangles joining irregularly spaced points of known elevation
In a TIN, sampled points are joined into triangles (often Delaunay), with denser triangles where the terrain is complex.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Digital Elevation Model (DEM) is:
सही उत्तर: क) A digital representation of ground surface elevations
A DEM stores terrain heights, usually in a grid, for analysis such as slope, drainage and visibility.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In GIS, the raster data model represents geographic features as:
सही उत्तर: क) A grid of cells (pixels), each holding a value
Raster data uses regular cells, whereas vector data stores features as points, lines and polygons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The atmospheric correction applied to EDM distances depends mainly on:
सही उत्तर: घ) Air temperature and pressure
The speed of the electromagnetic wave depends on the refractive index of air, which varies with temperature and pressure (and humidity).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A microwave EDM instrument (such as a tellurometer) differs from an infrared EDM mainly in that it:
सही उत्तर: घ) Requires a similar active instrument (remote unit) at the far end instead of a passive reflector
Microwave systems use a master and a remote unit, each transmitting and receiving, whereas infrared EDMs use passive prisms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A reflectorless total station is able to:
सही उत्तर: क) Measure distances to surfaces directly without a prism
Reflectorless EDM uses a laser that reflects off ordinary surfaces such as walls, useful where a prism cannot be placed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If h is the ellipsoidal height from GNSS and N is the geoid undulation (geoid height above the ellipsoid), the orthometric height H is:
सही उत्तर: क) H = h − N
Orthometric height above the geoid (≈ mean sea level) equals ellipsoidal height minus the geoid height.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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