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| Q. |
The vacuum inside a incandescent lamp is of the order of |
| A. | 10-3 mm Hg |
| B. | 10-2 mm Hg |
| C. | 10-4 mm Hg |
| D. | 10-5 mm Hg |
| E. | 10-6 mm Hg |
| Answer» C. 10-4 mm Hg | |
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