What do we call when the sound of frequency will be below 20 Hz?

Related Mcqs:

1. Sound of frequency below 20 Hz is:___________?

   A. Audiosonic
   B. Infrasonic
   C. Ultrasonic
   D. Supersonic

   Submitted by: Fahad Mehsud

2. The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________?

   A. 1120 ft
   B. 120 ft
   C. 56 ft
   D. 100 ft
   E. None of these

3. Name the branch of science which deals with the study of sound and sound waves?

   A. Aeronautics
   B. Acoustics
   C. Aerostatics
   D. Aetiology

   Submitted by: ABDUL HAYEE

4. A loudspeaker changes _________ energy into sound energy.

   A. Chemical
   B. Electrical
   C. Light
   D. Kinetic

   Submitted by: Danish Balani

5. Microphone converts sound energy into ___________?

   A. Microwaves
   B. Electrical signals
   C. Optical Signals
   D. Heat energy

   Submitted by: Fahad Iqbal

6. Echo is a ___________ of sound?

   A. Reflection
   B. Refraction
   C. Interference
   D. None

   Submitted by: Awais

7. Refraction of sound can occur in:

   A. Water
   B. Air
   C. Both A & B
   D. None of these

   Submitted by: Sami Khan

8. Speed of sound in water at 20 °C is___________?

   A. 1450 m/s
   B.1474 m/s
   C. 1498 m/s
   D. 1500+ m/s

   Submitted by: ARIF HUSSAIN

9. Sound travels in air at an average speed of nearly________ ?

   A. 1257 miles per hour
   B. 755 miles per hour
   C. 330 miles per hour
   D. None of these

   Submitted by: Rashid Mehmood

10. Which of the following is used for hearing the sound of heart and lungs?

    A. Steroscope
    B. Stethoscope
    C. Oscillator
    D. Oncolator

    Submitted by: Farhan Rana