Which one of the statements given below is not correct ?

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Q: 71 (NDA-I/2010)

Which one of the statements given below is not correct ?

question_subject: 

Geography

question_exam: 

NDA-I

stats: 

0,13,27,12,8,7,13

keywords: 

{'magnetic meridian': [2, 0, 1, 1], 'relative permeability': [0, 0, 1, 0], 'geographical meridian': [1, 0, 1, 0], 'magnetic field': [0, 0, 0, 6], 'vertical plane': [0, 0, 2, 1], 'magnet': [0, 0, 2, 6], 'dimensionless quantity': [0, 0, 1, 0], 'axis': [0, 0, 0, 1], 'rotation': [1, 0, 0, 2], 'earth': [0, 1, 1, 1]}