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Question

The following measurements were made during testing a levelling instrument.

P1=2.800
P2=2.700
Q1=1.700
Q2=1.800

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

A
101.000 m
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B
99.000 m
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C
100.000 m
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D
102.000 m
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Solution

The correct option is A 101.000 m
Exact height difference,

H=(hQ1hP1)+(hQ2hP2)2
H=(1.7002.800)+(1.8002.700)2
H=1m
R.L of Q = R.L of P H

R.L of Q = 100.000(1)

R.L of Q = 101.000m

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