Multiple choice

Consider the following statements:

  1. If a person inhales helium, the person speaks with low pitched voice.
  2. In hearing aid, microphone converts the electrical signal to sound signal.

Which of the given statements is/ are incorrect?

  1. Only (1)

  2. Only (2)

  3. Both (1) & (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (1) is wrong. If a person inhales helium, the person speaks with high pitched voice.

Sound moves at different speeds through different gases. As it is not a normal atmosphere, the sound moves faster, compressing the wavelength to a higher pitched noise. Statement (2) is wrong. In hearing aid, the sound is received by microphone by which sound signal converts to electrical signal.

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