Multiple choice

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

  1. Audiometer

  2. Crescograph

  3. Hydrophone

  4. Audiophone

Reveal answer Fill a bubble to check yourself
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.