speed of sound in dry air at 20 °C is___________?

Related Mcqs:

1. 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

2. The speed of sound in air at sea level is approximately____________?

   A. 300 meter per second
   B. 320 meter per second
   C. 340 meters per second
   D. 370 meter per second

   Submitted by: ABDUL AZIZ KHAN

3. 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

4. Speed of sound in air is _______km/h?

   A. 1347
   B. 243
   C. 1235
   D. 1495

   Submitted by: Warraich

5. The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?

   A. The hair barging against the charged comb
   B. Small electric sparks
   C. The rubbing of the comb with the hair
   D. None of the above

6. 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

7. 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

8. Velocity of sound in air does not change with the change of?

   A. Temperature of air
   B. Pressure of air
   C. Moisture content in air
   D. Wind in the direction of propagation of sound

   Submitted by: Malik Asghar Hussain

9. Sound travels about ___________times faster in water than in air.

   A. 2
   B. 3
   C. 4
   D. 5

   Submitted by: Munwar Ali Sohu

10. When sound waves travel from air to water which of the following quantities remains unchanged?

    A. Speed
    B. Frequency
    C. Intensity
    D. Wavelength

    Submitted by: Rashid Mehmood