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A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

  • A.Increase
  • B.Decrease
  • C.Remain unaffected
  • D.Have its shape changed

Answer: A

The volume of the cavity will increase.

On heating, every linear dimension of the solid grows by the same factor, and the cavity scales with the rest - it expands exactly as if it were filled with the same metal. This is why a hole in a heated plate gets bigger, not smaller.

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