Civil Engineering All Engineering Career
Question 71
An imaginary line joining the point of intersection of the cross-hairs of the diaphragm and the optical centre of the object glass, is known as ?
An imaginary line joining the point of intersection of the cross-hairs of the diaphragm and the optical center of the object glass is known as the line of collimation. This line is crucial in surveying as it defines the direction in which the instrument is sighting.
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Question 72
An axis about which the telescope can be rotated in a horizontal plane, is called ?
The correct answer is horizontal axis.
The axis about which a telescope can be rotated in a horizontal plane is called the horizontal axis.
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Question 73
A branch of surveying in which the horizontal and vertical distances of points are obtained instrumental observations, is known as ?
The correct answer is tacheometric surveying.
Tacheometric surveying is a branch of surveying where both horizontal and vertical distances of points are obtained using instrumental observations, typically with a tacheometer.
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Question 74
To find the true difference of level between two points, the level should be kept ?
The correct answer is exactly midway between the two points.
When the level is placed exactly midway between the two points, it minimizes errors due to the curvature of the Earth and refraction, ensuring the most accurate measurement of the true difference in level.
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Question 75
The surveying used to determine additional details such as boundaries of fields, is ?
The correct answer is cadastral surveying.
Cadastral surveying is used to determine additional details such as boundaries of fields, properties, and other land parcels. It is commonly used for the creation of legal property boundaries and records.
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Question 76
The method of plane tabling commonly used for establishing the instrument stations only, is a ?
The correct answer is method of resection .
The method of resection is actually used in plane table surveying to determine the position of the instrument station by observing and plotting known points.
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Question 77
An angle between the inclined line of sight and the horizontal is called ?
The correct answer is vertical angle.
The angle between the inclined line of sight and the horizontal is called the vertical angle.
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Question 78
A method of differential levelling is used in order to find the difference in elevation between two points when ?
The correct answer is all of the above.
Differential leveling is used to find the difference in elevation between two points when they are too far apart, there are obstacles between them, or the difference in elevation between them is too great. It helps in accurately determining the vertical difference over long distances or challenging terrains.
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Question 79
The plotting of small areas which can be commanded from a single station is usually done on the plane table by the method of ?
The correct answer is radiation.
In plane table surveying, the method of radiation is used to plot small areas from a single station. This involves sighting from the instrument station to various points on the ground and plotting their positions directly on the map.
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Question 80
In any closed traverse, if the survey work is correct, then ?
The correct answer is all of the above.
In a closed traverse, if the survey work is correct:
- The algebraic sum of latitudes (northings and southings) should be equal to zero.
- The algebraic sum of departures (eastings and westings) should be equal to zero.
- The sum of northings should be equal to the sum of southings.
These conditions ensure that the traverse is correctly closed and balanced.