PPSC Excise and Taxation Inspector 2018 Question Paper

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32.

The audible frequency range of human ear is :

A: 20 Hertz to 200 Hertz
B: 200 Hertz to 2000 Hertz
C: 2 Hertz to 20 Hertz
D: 20 Hertz to 20000 Hertz

The answer is: D

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Explanation

Answer: D - 20 Hertz to 20,000 Hertz

 

Explanation:

  • The normal human ear can hear sounds in the frequency range of 20 Hz to 20,000 Hz (20 kHz).
  • Below 20 Hz = Infrasound - humans cannot hear it
  • Above 20,000 Hz = Ultrasound - humans cannot hear it
  • This range narrows with age - older people typically lose ability to hear higher frequencies first

 

Animals and their hearing ranges:

  • Human : 20 Hz to 20,000 Hz
  • Dog : 40 Hz to 65,000 Hz
  • Cat : 48 Hz to 85,000 Hz
  • Bat : 1,000 Hz to 120,000 Hz
  • Dolphin : 200 Hz to 150,000 Hz