Multiple choice

The following measurements were made during testing a levelling instrument. ||| |---|---| | Instrument at| Staff Reading at| |||| |---|---|---| | | P1| Q1| | P| 2.800 m| 1.700 m| | Q| 2.700 m| 1.800 m|

P1 is close to P and Q1 is close to Q. If the reduced level of station P is 100.000 m, the reduced level of station Q is

  1. 99.000 m

  2. 100.000 m

  3. 101.000 m

  4. 102.000 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The true difference in elevation between P and Q is calculated by the difference in staff readings. For instrument at P: (2.800 - 1.700) = 1.100 m. For instrument at Q: (2.700 - 1.800) = 0.900 m. The average rise is (1.100 + 0.900) / 2 = 1.000 m, so the RL of Q is 100.000 + 1.000 = 101.000 m.

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