# Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 4 (Q.No. 5)

5.

Which of the following introduces an error of about 1 in 1000 if 20 m chain is used

Discussion:

12 comments Page 1 of 2.
Shah Sawar said:
3 years ago

Slope Correction or error = h^2/2L.

Now we want to find the difference in height of chain ends for which 1 in 1000 or 20 mm in 20 m chain length will produce.

0.02 = h^2/(2 x 20),

h = 0.9 m,

So, option B along with A, C options is correct.

Now we want to find the difference in height of chain ends for which 1 in 1000 or 20 mm in 20 m chain length will produce.

0.02 = h^2/(2 x 20),

h = 0.9 m,

So, option B along with A, C options is correct.

(2)

Maithri said:
4 years ago

Can you explain how you got 0.89 @Sudip.

NAMAN soni said:
4 years ago

Please explain the given solution.

Sudip said:
4 years ago

Slope error= 20mm = h^2/2L.

Then, h=0.89m~0.9m.

i.e. one end is 0.9m higher/lower than another end.

Then, h=0.89m~0.9m.

i.e. one end is 0.9m higher/lower than another end.

(1)

Raz said:
4 years ago

Why all of the above.

Laxmi said:
4 years ago

Please give an explanation clearly.

Biks said:
6 years ago

Answer should be A.

Saikat said:
6 years ago

1 in 1000 means 1000 m = 1m.

then 20 m = 1/1000* 20=20mm.

then 20 m = 1/1000* 20=20mm.

Ritu said:
6 years ago

Someone please explain the concept.

Ramakanth said:
7 years ago

Explain the answer.

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