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प्रश्न
Why was a compass useful to sailors, travellers, and surveyors for navigation before GPS?
विकल्प
Its magnetic needle produces isolated magnetic poles.
Its magnetic needle removes Earth's magnetic field.
Its magnetic needle points only towards magnetic substances.
Its magnetic needle aligns with Earth's magnetic field and provides direction.
MCQ
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उत्तर
A compass provides direction because its magnetic needle aligns with Earth's magnetic field. Before GPS, sailors, travellers, and surveyors used this behaviour for navigation.
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