Civil Engineering - UPSC Civil Service Exam Questions - Discussion


In an old map, line PQ was drawn to a magnetic bearing of 6°32', the magnetic declination at that time being 1° East. The present magnetic declination is 9°42' East. The magnetic bearing to which the line is set at present is

[A]. 357° 50'
[B]. 356° 50'
[C]. 3° 10'
[D]. 2° 10'

Answer: Option A


No answer description available for this question.

Lara said: (Jul 10, 2017)  
Explain the answer please.

Roy said: (Jul 22, 2017)  
According to me, TB=MB (+/-) declination . So TB=6.32+1=7.32.

Now, mb=7.32-9.42= -2°10' I think as it is -2°10 so it is,

Correct me, if I am wrong.

Faisal said: (Nov 22, 2018)  
Yes, true bearing is equal to magnetic bearing (+-) declination - is used when west and + used when east so correct answer is A.

Karan Panjabi said: (Jan 6, 2019)  
The declination in both the case is EAST, so how it is possible to first add for magnetic declination and then subtract for the same EAST direction?

Veena A Mohan said: (Aug 1, 2020)  

First, we have found out true bearing.

TB is MB plus East declination always. (ie if E is given add if W is given subtract). Then you got TB. From that TB only u r gonna find the MB.

So, MB +Eis TB.
Here you need TB -E.

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