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The correct answer is "30m."

The degree of the curve is commonly defined as the angle subtended by a chord of 30 meters. This is a standard measure in civil engineering and surveying to describe the curvature of a curve.

The correct answer is "isogonic lines."

Isogonic lines are lines on the Earth's surface that connect points where the magnetic declination is the same at a given time.

The correct answer is "any one of these."

The process of turning the telescope of a theodolite over its supporting axis through 180° in a vertical plane can be referred to as transiting, reversing, or plunging. All these terms describe the same action of flipping the telescope to observe the opposite direction.

The correct answer is "definition."

The capacity of a telescope to produce a sharp and clear image is referred to as its definition. This term describes the instrument's ability to resolve fine details in the observed object.

The correct answer is "resolving power."

The power of a telescope to form distinguishable images of objects that are separated by a small angular distance is referred to as its resolving power. It indicates the telescope's ability to distinguish between two closely spaced objects.

The correct answer is "difference between the included angle and 180°."

A deflection angle in a traverse is equal to the difference between the included angle and 180°. This angle is used to determine the direction of the next traverse line relative to the previous one.

none of the above

The correct answer is "foresight reading."

A staff reading taken on a point whose elevation is to be determined is called a foresight reading. This reading helps to determine the elevation of the point relative to the instrument.

The correct answer is "all of the above."

Plane table surveying is:

• Most suitable for preparing small-scale maps: It is often used for detailed mapping of small areas.
• Particularly advantageous in magnetic areas: Since it does not rely on magnetic instruments, it avoids errors caused by local magnetic disturbances.
• Less costly than a theodolite survey: The equipment required for plane table surveying is generally simpler and less expensive compared to a theodolite survey.

Thus, it is advantageous in all the mentioned aspects.

The correct answer is "1/10000."

To find the representative fraction (RF), you can use the formula:

RF=Map DistanceGround Distance\text{RF} = \dfrac{\text{Map Distance}}{\text{Ground Distance}}RF=Ground DistanceMap Distance​

Here, 1 cm on the map represents 10 meters on the ground. Converting 10 meters to centimeters (1000 cm), the RF is:

RF=1 cm1000 cm=110000\text{RF} = \dfrac{1 \text{ cm}}{1000 \text{ cm}} = \dfrac{1}{10000}RF=1000 cm1 cm​=100001​