Three different vibrating objects produce three types of sounds X, Y and Z.
Sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily.
The sound X is used in hospital to break kidney stones of a patient into fine grains which then get flushed out with Urine. The sound similar to that which is produced during an earthquake before the main shock wave is generated.
Name one device in our homes which can produce sound like Z.

oven

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doorbell

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no such device is there in our homes.

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all devices produce such sound

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Solution

The correct option is B doorbell
Ultrasound is used for removing kidney stones.
When ultrasound are targeted on such stone,the stones start vibrating at high frequency. The stone due to this vibratory motion. Breakdown into fine particles. Ultrasounds and infrasounds are not audible to man. Ultrasound have frequency more than 20 kHz. A doorbell can produce an audible sound.
Infrasound have frequency below 20 Hz
X is ultrasound.
Y is infrasound
Z is audible sound.

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