The frequency of a sound wave determines its: MCQ with Answer and Explanation
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Question #1
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Assertion (A): The acceleration due to gravity is less at the equator than at the poles. Reason (R): Earth's rotation causes a centrifugal effect that reduces effective gravity at the equator.
Correct Answer: Option B
Explanation:
Assertion is true: g is about 9.78 m/s² at equator vs 9.83 m/s² at poles. Reason is true and correctly explains A: Earth's rotation creates centrifugal acceleration outward, maximum at equator (radius of rotation = Earth's radius), reducing effective g. Additionally, equatorial bulge increases distance from center, further reducing g. Memory tip: 'Rotation effect: g_effective = g - ω²R cos²φ'. This assertion-reason question tests nuanced understanding of gravity variation, common in competitive exams. Always verify both statements independently before assessing the explanatory link.
Assertion is true: g is about 9.78 m/s² at equator vs 9.83 m/s² at poles. Reason is true and correctly explains A: Earth's rotation creates centrifugal acceleration outward, maximum at equator (radius of rotation = Earth's radius), reducing effective g. Additionally, equatorial bulge increases distance from center, further reducing g. Memory tip: 'Rotation effect: g_effective = g - ω²R cos²φ'. This assertion-reason question tests nuanced understanding of gravity variation, common in competitive exams. Always verify both statements independently before assessing the explanatory link.
Question #2
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The unit of work is
Question #3
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A car moving with speed 54 km/h is stopped in 5 s. The distance covered before stop is
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