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 level cross-section of a road embankment has a formation width of 10 m, side slopes of 2 horizontal to 1 vertical and a height of 2 m. Its area is:
सही उत्तर: ग) 28 m²
Area = (b + sh)h = (10 + 2 × 2) × 2 = 28 m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the polar planimeter area formula A = M(F − I ± 10N + C), the term N denotes:
सही उत्तर: ग) The number of times the zero of the dial passes the index mark
N counts complete revolutions of the dial during tracing, with + or − depending on the direction in which the zero passes the index.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mid-ordinates of 2, 3, 4 and 5 m are measured at the centres of four 10 m divisions along a base line. By the mid-ordinate rule, the area is:
सही उत्तर: ग) 140 m²
Area = interval × sum of mid-ordinates = 10 × (2 + 3 + 4 + 5) = 140 m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The transition curve generally adopted on railways because it is easy to set out by offsets is the:
सही उत्तर: ख) Cubic parabola
Railways commonly use the cubic parabola, an approximation of the spiral that is convenient to set out with offsets.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bernoulli's lemniscate is generally preferred as a transition curve for:
सही उत्तर: घ) Highways, especially where the curve is wholly transitional
The lemniscate's radius decreases more slowly at large deflections, and it suits highway curves that are transitional throughout.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two grades of +2% and −1% are to be joined by a vertical curve with a rate of change of grade of 0.1% per 20 m. The length of the vertical curve is:
सही उत्तर: ग) 600 m
Total change of grade = 2 − (−1) = 3%; number of 20 m stations = 3/0.1 = 30; length = 30 × 20 = 600 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The two-theodolite method of setting out a circular curve is particularly useful when:
सही उत्तर: ख) The ground is rough and linear measurements are difficult
The method fixes each peg by intersecting angles from two theodolites at the tangent points, requiring no chaining.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A curve has a degree of 2° defined on a standard arc of 20 m. Its radius is about:
सही उत्तर: घ) 573 m
R = 20/(2° in radians) = 20/0.0349 ≈ 573 m (i.e., R = 1146/D for a 20 m arc).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Rankine's method, the tangential angle (in minutes) for a chord c on a curve of radius R is 1718.9 c/R. For c = 20 m and R = 400 m, it is about:
सही उत्तर: क) 1°25.9'
δ = 1718.9 × 20/400 = 85.9 minutes = 1°25.9'.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a simple circular curve of radius 200 m and deflection angle 60°, the mid-ordinate R(1 − cos Δ/2) is about:
सही उत्तर: ख) 26.8 m
M = 200 × (1 − cos 30°) = 200 × (1 − 0.866) = 26.8 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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