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| Q. |
A copper disc has a hole. If the disc is heated, the size of the hole - |
| A. | increases |
| B. | decreases |
| C. | No change |
| D. | first increases and than decreases |
| Answer» A. increases | |
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Explanation: When a metal plate with a circular hole at its centre is heated, definitely along with the areal expansion of the plate the diameter (sum of two radii) of the circular hole also increases. |
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