Sound of frequency below 20 Hz is:___________?

Related Mcqs:

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

   A. Audio sounds
   B. Infrasonic
   C. Ultrasonic
   D. Supersonics

   Submitted by: Shuaib Uddin

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. Microphone converts sound energy into ___________?

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

   Submitted by: Fahad Iqbal

5. Echo is a ___________ of sound?

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

   Submitted by: Awais

6. Sound waves are _________ waves.

   A. Transverse
   B. Electromagnetic
   C. Longitudinal
   D. None of these

7. Sound travels_______ in solid materials then liquid?

   A. Constant
   B. Slowest
   C. Fastest
   D. None of these

   Submitted by: Ghulam Murtaza

8. Refraction of sound can occur in:

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

   Submitted by: Sami Khan

9. 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

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