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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A robotic total station differs from a conventional one mainly in that it:
सही उत्तर: घ) Has servo motors and automatic target recognition, so it can track a prism and be operated remotely by one person
Robotic instruments turn themselves to follow the prism, allowing single-person surveys and stake-out.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pulse-type (time-of-flight) EDM determines distance by:
सही उत्तर: ग) Measuring the time taken by a short light pulse to travel to the target and back
Distance = speed of light × travel time ÷ 2; this method is common in reflectorless and long-range laser instruments.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Master Control Station of the GPS control segment is located at:
सही उत्तर: ख) Schriever Space Force Base, Colorado, USA
The GPS master control station at Schriever (Colorado) computes orbit and clock data and uploads them via ground antennas.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An 'elevation mask' (cut-off angle) of about 10° to 15° is set in a GNSS receiver in order to:
सही उत्तर: क) Exclude low satellites whose signals suffer more atmospheric delay and multipath
Signals from satellites near the horizon pass through more atmosphere and are more prone to multipath, so they are ignored.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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।
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