A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest?

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Q. A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest?

(A) Cube
(B) Plate
(C) Sphere
(D) All will cool at the same rate

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✅ Correct Answer: (C) Sphere

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