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 theodolite with its horizontal axis 1.5 m above the ground is set 50 m from the base of a tower on level ground. The angle of elevation to the top is 45°. The height of the tower is:
सही उत्तर: क) 51.5 m
Height above the instrument axis = 50 tan 45° = 50 m; adding the instrument height gives 51.5 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the angle of elevation of a point is 30°, its zenith angle is:
सही उत्तर: ख) 60°
Zenith angle = 90° − angle of elevation = 90° − 30° = 60°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A straight line is prolonged with a theodolite by 'double sighting' (face left and face right) in order to:
सही उत्तर: ग) Eliminate errors due to the line of collimation and horizontal axis adjustments
The mean of points set with face left and face right lies on the true prolongation, cancelling instrumental errors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which theodolite error in horizontal angle measurement is eliminated by taking the mean of face left and face right observations?
सही उत्तर: घ) Error due to the line of collimation not being perpendicular to the horizontal axis
Collimation error changes sign on changing face, so averaging face left and face right cancels it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a vernier theodolite, when the upper clamp is kept fixed and the instrument is turned using the lower clamp and lower tangent screw (lower motion):
सही उत्तर: क) Both plates rotate together, so the reading does not change
Lower motion turns the whole instrument with the plates clamped together; it is used to bring the reading onto a station without changing it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The size of a vernier theodolite (e.g. a 20 cm theodolite) is designated by the:
सही उत्तर: ख) Diameter of the graduated circle of the lower plate
Theodolite size refers to the diameter of the main horizontal graduated circle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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On a contour map, a series of closed contours whose values decrease towards the centre represents a:
सही उत्तर: घ) Depression (pond or basin)
Closed contours with decreasing values inward indicate a depression; increasing values indicate a hill.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A low point or pass between two hills or summits is represented on a contour map as a:
सही उत्तर: क) Saddle
A saddle is a depression between two high points, shown by contours of two hills facing each other.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Points A and B, 40 m apart, have RLs of 101.0 m and 106.0 m. Assuming a uniform slope, the 105 m contour lies at what distance from A?
सही उत्तर: क) 32 m
Rise from A to the contour = 4 m out of a total of 5 m, so distance = 40 × 4/5 = 32 m from A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a small-scale map of rugged, hilly terrain, the contour interval is generally kept:
सही उत्तर: ख) Larger
Contour interval increases with smaller map scale and steeper ground; otherwise contours would be too crowded to read.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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