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Mechanical pulse having an oscillation frequency in range of `_____________

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Mechanical pulse having an oscillation frequency in range of `_____________

(a) 30 kHz to 40 kHz

(b) 40 kHz to 50 kHz

(c) 50 kHz to 60 kHz

(d) 60 kHz to 70 kHz

The question was posed to me during an internship interview.

Question is taken from Pulse Velocity Test in portion Testing of Concrete of Concrete Technology

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Correct answer is (b) 40 kHz to 50 kHz

The explanation: Mechanical pulse having an oscillation frequency in range of 40000 Hz to 50000 Hz.

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