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प्रश्न
Match the following:
| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
| 2. | Mass of electron | b. | -1 |
| 3. | Charge of electron | c. | 9.31 x 10-28g |
| 4. | Charge of proton | d. | 1.67 x 10-24g |
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उत्तर
| Column A | Answer | ||
| 1. | Mass of proton | d. | 1.67 x 10-24g |
| 2. | Mass of electron | c. | 9.31 x 10-28g |
| 3. | Charge of electron | b. | -1 |
| 4. | Charge of proton | a. | +1 |
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