सिभिल इन्जिनियरिङ
सिभिल इन्जिनियरिङ
Civil Engineering · ५,१७१ प्रश्न
५,१७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सिभिल इन्जिनियरिङ: 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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Precise Point Positioning (PPP) in GNSS gives high accuracy with a single receiver by using:
सही उत्तर: घ) Precise satellite orbit and clock corrections, usually with dual-frequency carrier-phase data
PPP replaces the reference station with precise orbit and clock products, reaching centimetre-to-decimetre accuracy after convergence.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A major advantage of Synthetic Aperture Radar (SAR) imaging over optical imaging is that it:
सही उत्तर: ग) Can image through clouds and at night
Microwaves penetrate clouds and, being an active system, SAR does not depend on sunlight.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Sentinel-2 earth observation satellites, providing free multispectral imagery at up to 10 m resolution, are operated under the Copernicus programme by the:
सही उत्तर: ख) European Space Agency
Sentinel-2 is part of the EU's Copernicus programme, built and operated by ESA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A remote sensing sensor with 8-bit radiometric resolution can record how many distinct brightness levels?
सही उत्तर: ग) 256
Radiometric resolution of n bits gives 2ⁿ levels; 2⁸ = 256 levels (0 to 255).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The multispectral sensors of the Landsat satellites (TM, ETM+ and OLI) have a spatial resolution of about:
सही उत्तर: क) 30 m
Landsat's reflective multispectral bands have 30 m pixels, with a finer 15 m panchromatic band on later sensors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The basic elements used in visual interpretation of aerial photographs include:
सही उत्तर: घ) Tone, texture, shape, size, pattern, shadow and association
Interpreters identify objects by these image characteristics, e.g. the shadow of a tower or the pattern of an orchard.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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On a tilted aerial photograph, the 'nadir point' (plumb point) is:
सही उत्तर: ग) The point where a vertical line through the camera's perspective centre meets the photograph
The nadir is the image of the ground point vertically below the camera; for a truly vertical photograph it coincides with the principal point.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two sides of a triangular plot measure 40 m and 30 m, and the included angle is 30°. The area of the plot is:
सही उत्तर: ख) 300 m²
Area = ½ ab sin C = ½ × 40 × 30 × sin 30° = 300 m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among triangulation figures, a simple chain of triangles is:
सही उत्तर: क) The quickest and most economical, but the least accurate as it has few checks
A single chain of triangles has few redundant conditions, so it is cheap and fast but less precise than quadrilaterals or polygons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Electronic theodolites and total stations read their horizontal and vertical circles by means of:
सही उत्तर: घ) Rotary encoders that convert the circle position into electronic signals
Glass circles with coded or incremental patterns are read photo-electrically by encoders and displayed digitally.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
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