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Q1:

During secular variation of magnetic meridian at different places

A range of oscillations is constant

B period of oscillation is constant

C range and period of oscillation both vary

D period of oscillation only varies.

ANS:C - range and period of oscillation both vary

The magnetic meridian swings like a pendulum. It swings in one direction for a long time (100 to 200 years) and gradually comes to rest and then swings in the opposite direction.

The change produced annually by secular variation amounts in different places from 0 to 12 minutes (Period) but does not remain constant at any place.



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