Question:
Which one of the following instrument is generally used to measure the slope angle of the ground?
Which one of the following instrument is generally used to measure the slope angle of the ground?
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Different surveying instruments serve different purposes. To measure the angle of slope (inclination) of the ground, a special hand instrument is used.
Updated On: Jun 16, 2026
- Optical square
- Cross staff
- Abney level
- Cross meter
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The Correct Option is C
Solution and Explanation
Concept:
Different surveying instruments serve different purposes. To measure the angle of slope (inclination) of the ground, a special hand instrument is used.
Step 1:
The Abney level is a compact hand instrument fitted with a graduated arc and a bubble. By sighting along a target and centring the bubble, it directly reads the vertical angle or slope of the ground.
Step 2:
The optical square and cross staff are used to set out right angles (perpendicular offsets) in chain surveying, not slopes. There is no standard instrument called a cross meter for this purpose.
Answer: Option (3) — Abney level.
Different surveying instruments serve different purposes. To measure the angle of slope (inclination) of the ground, a special hand instrument is used.
Step 1:
The Abney level is a compact hand instrument fitted with a graduated arc and a bubble. By sighting along a target and centring the bubble, it directly reads the vertical angle or slope of the ground.
Step 2:
The optical square and cross staff are used to set out right angles (perpendicular offsets) in chain surveying, not slopes. There is no standard instrument called a cross meter for this purpose.
Answer: Option (3) — Abney level.
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