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level line and level surface
A level line is aa)horizontal lineb)line parallel to the mean spheriodal surface of earthc)line passing through the centre of cross hair sand the centre of eye-pieced)line passing through the objective lens and

A level line is aa)horizontal lineb)line parallel to the mean spheriodal surface of earthc)line passing through the centre of cross hair sand the centre of eye-pieced)line passing through the objective lens and

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Explanation: A level line is a line parallel to the mean spheroidal surface of the earth. It is an imaginary line that represents a horizontal plane passing through a point. The mean spheroidal surface of the earth is an irregular surface that deviates from a perfect sphere due to variations in the earth's mass distribution. Importance of Level Line in Civil Engineering: - In civil engineering, level lines are used to establish a reference plane for construction work. - They are used to measure height differences between different points on the earth's surface. - Level lines are also used to determine the slope of the ground and the direction of drainage. - They are used to layout roads, buildings, and other structures. - Level lines are also used in surveying and mapping to create accurate topographic maps. Types of Level Lines: - Temporary Level Line: These are established for temporary construction work and are not intended to be permanent. They are usually established using a dumpy level or a tilting level. - Permanent Level Line: These are established for permanent structures such as buildings, bridges, and roads. They are usually established using a precise leveling instrument such as a digital level. Conclusion: In conclusion, a level line is a line parallel to the mean spheroidal surface of the earth. It is an important reference plane used in civil engineering for construction work, surveying, and mapping.