Consider the following in the context of variations in magnetic declination:
A. Secular
B. Diurnal
C. Annual
D. Regular
Choose the correct answer from the options given below :
A. Secular
B. Diurnal
C. Annual
D. Regular
Choose the correct answer from the options given below :
Show Hint
- A, B and C only
- A, B and D only
- B and C only
- C and D only
The Correct Option is A
Solution and Explanation
Step 1: Identify standard types of variations.
• Secular Variation (A): Changes that occur over long periods (centuries). It is the most significant variation for map-making.
• Diurnal Variation (B): Daily changes caused by the sun's influence on the Earth's magnetic field.
• Annual Variation (C): Small yearly changes in declination.
• Irregular Variation: Caused by magnetic storms or solar flares.
Step 2: Evaluate Option D.
There is no specific category termed "Regular" variation in the context of magnetic declination nomenclature; rather, the variations are grouped by their specific timeframes (daily, yearly, secular). Therefore, only A, B, and C are correct.
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