Civil Engineering - UPSC Civil Service Exam Questions - Discussion

8. 

A and B are two traverse stations free from local attraction errors. If the true bearing of a line AB is 89°, and the magnetic declination at point A is 1° West, then the magnetic bearing of the line BA would be

[A]. 88°
[B]. 90°
[C]. 268°
[D]. 270°

Answer: Option B

Explanation:

No answer description available for this question.

Vipul said: (Nov 24, 2016)  
The answer should be 270°.

Ramya said: (Jul 13, 2017)  
But how? Explain.

Roy said: (Jul 21, 2017)  
Magnetic bearing of AB=89+1=90.

So magnetic bearing of BA=90+180=270.

Sam said: (May 11, 2018)  
Yes, 270° is the correct answer.

Sandeep Kumar said: (Jul 23, 2018)  
Yes 270° is the correct answer.

Md Aqeel Ahmed said: (Feb 23, 2019)  
MB of AB = 89-1 =88 (1° West).
Bearing of BA = 88+180= 268.
West means -.
East means +.

Bongil said: (Dec 4, 2020)  
Magnetic bearing = true bearing +declination.
= true bearing + declination.
= 89+1= 90°.

Balvinder Guleria said: (Jan 14, 2021)  
True bearing of AB=89°
BA = 180 + 89 = 269,

Megnetic declinations=1w(-ve).
TB = MB-MD.
269°= MB-1,
MB = 269 + 1,
MB = 270°.

Vivek said: (Apr 10, 2021)  
268° is the correct answer.

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