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Which of the following instrument is used for recording the chest-wall movements over the apex of heart?

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Which of the following instrument is used for recording the chest-wall movements over the apex of heart?

(a) Apexcardiograph

(b) Ballistocardiograph

(c) Electro-oculograph

(d) Electro-retinograph
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Correct choice is (a) Apexcardiograph

To explain I would say: An apexcardiograph records the chest-wall movements over the apex of the heart. These movements are in the form of vibrations having a frequency range of 0.1 to about 20 Hz.
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