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प्रश्न
| Column A | Column B |
| (a) Vibrations cause | (1) absorb sound |
| (b) A shriller sound is | (2) second |
| (c) Unit of frequency | (3) sound |
| (d) Unit of time period | (4) of high pitch |
| (e) Curtains | (5) hertz |
उत्तर
| Column A | Column B |
| (a) Vibrations cause | (3) sound |
| (b) A shriller sound is | (4) of high pitch |
| (c) Unit of frequency | (5) hertz |
| (d) Unit of time period | (2) second |
| (e) Curtains | (1) absorb sound |
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