Civil Engineering All Engineering Career

The correct answer is checks the accuracy of the framework 

The correct answer is two dimensions.

A plain scale is used to read two dimensions, typically length and breadth (e.g., distance and height) or any other two-dimensional measurements.

The correct answer is "reconnaissance surveys."

Pacing is a quick and approximate method of measuring distance, often used in reconnaissance surveys. This type of survey is typically conducted to gather preliminary information about a large area before more detailed surveys are carried out. However, pacing can also be used in preliminary and location surveys, though it is primarily associated with reconnaissance work.

The correct answer is "mutually intervisible."

Direct ranging is possible only when the end stations are mutually intervisible, meaning that each station can be seen from the other. This allows for accurate alignment and measurement between the two points.

The correct answer is "negative error."

When the measured length is less than the actual length, the error is referred to as a negative error. This type of error occurs when the measurement is shorter than the true value.

The correct answer is "normal tension."

Normal tension is the tension at which the effects of both pull (tensile force) and sag (due to gravity) on a tape are neutralized, resulting in the most accurate measurement of length.

The correct answer is "all of the above."

A plumb bob is required in all of the following situations:

• When measuring distances along slopes in a hilly country to ensure vertical alignment.
• For accurate centering of a theodolite over a station mark.
• For testing the verticality of ranging poles to ensure they are perfectly vertical.

The correct answer is "negative error."

When the chain used in measuring distance is longer than the standard length, the measured distance will be shorter than the actual distance, resulting in a negative error.

The correct answer is "three sides."

In chain surveying, the framework consists of triangles because a triangle can be uniquely plotted if the lengths of its three sides are known. This principle ensures accurate and unambiguous plotting of the surveyed area.

The correct answer is "all of these."

The accuracy in laying down and measuring perpendicular offsets depends on:

• Scale of plotting: Larger scales provide more precise measurements and can reveal small errors more clearly.
• Length of offset: Shorter offsets are generally more accurate due to reduced measurement errors.
• Importance of the object: For critical measurements, more care and precision are required, affecting the overall accuracy.