Q1. Sound is produced when a body __________.
Q2. Which is called Voice Box in human body?
Q3. Which part vibrates when we speak ?
Ans: Vocal Cord
Q4. Which insect doesn’t have Voice Box ?
Q5. How the bees produce sound without having Voice Box?
Ans: They produce sound by moving their wings up and down very fast.
Q6. Can sound travel through vacuum?
Q7. Which range of frequencies of sounds are audible to Human ears?
Ans: 20 Hz to 20,000Hz.
Q8. Can we hear Ultrasonic Sound / Subsonic Sound?
Q9. Which animals can hear Ultrasonic sounds?
Q10. Sound of frequency of below 20 Hz is called____________?
Ans: Subsonic Sound or Infrasonic Sound
Q11. Sound of frequency of above 20,000 Hz is called ______?
Ans: Ultrasonic Sound.
Q12. What is the speed of Sound in Gas medium?
Q13. What is the speed of Sound in Water?
Q14. What is the speed of Sound within Iron /steel?
Q15. Does speed of sound increase / decrease with increase in temperature?
Ans: It increases with increase in temperature.
Q16. What is the rate of increase of speed of sound for 1 Degree C rise in temperature?
Q17. The speed of sound is more humid air / dry air?
Ans: Humid Air