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प्रश्न
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
जोड़ियाँ मिलाइएँ
उत्तर
| 1. | Stethoscope | b. | Multiple reflections |
| 2. | Echogram | c. | Ultrasonic waves |
| 3. | SONAR | d. | Speed of underwater objects |
| 4. | Reverberation | a. | Repeated reflections |
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