Directions: In this question, out of the four given alternatives, choose the one which can be substituted for the given words/sentence.
An instrument used for improving imperfect sense of hearing
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Audiometer
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Crescograph
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Hydrophone
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Audiophone
D
Correct answer
Explanation
Explanation for option 1: An audiometer is a machine used for evaluating hearing loss.
Explanation for option 2: A crescograph is a device for measuring growth in plants.
Explanation for option 3: A hydrophone is a microphone which detects sound waves under water.
Explanation for option 4: A device used for hearing.