Quiz: Noise Pollution

1. In terms of wave type, sound is a:

2. Sound with frequency below 20 Hz is termed:

3. Which of the following is a subjective measure of sound perception that depends on frequency and SPL?

4. In seismic waves, which type of wave is analogous to sound waves in air?

5. Which parameter is defined as the difference between instantaneous atmospheric pressure and normal atmospheric pressure due to sound?

6. Why are low-frequency male voices more difficult to block with typical building walls compared to children’s higher-pitched voices?

7. The reference sound pressure (P₀) used in calculating Sound Pressure Level is:

8. An increase of 10 dB in sound level corresponds to an increase in sound intensity by a factor of:

9. The phenomenon where a wall becomes “acoustically transparent” at a specific frequency because the bending wave in the wall matches the airborne sound wavelength is called:

10. The human hearing range is generally:

11. When sound travels through the bulk of a liquid (like water), which type of wave propagation is possible?

12. A deep male voice with a fundamental frequency of 100 Hz travels through air (speed ≈ 343 m/s). What is its approximate wavelength?

13. In the formula SPL (dB) = 20 log₁₀(P / P₀), if the measured sound pressure (P) is doubled, what is the increase in SPL?

14. A child’s voice with frequency 350 Hz has a wavelength of approximately 0.98 m. If the frequency drops to 175 Hz, what happens to the wavelength, assuming constant speed of sound?

15. Which factor primarily determines the fundamental frequency (pitch) of a human speaking voice?

16. Sound intensity is measured in:

17. When sound travels through the bulk of a liquid (like water), which type of wave propagation is possible?

18. What is the scientific distinction between ‘sound’ and ‘noise’?

19. Noise pollution can affect wildlife by:

20. Arrange the following groups in order of increasing fundamental frequency (pitch) of speaking voice:

21. Which of the following is a physiological effect of prolonged noise exposure?

22. Which of the following is NOT a major contributor to noise pollution?

23. Which sound level is typically associated with ‘normal conversation’?

24. In noise control engineering, transverse waves become critically important when studying:

25. The ‘threshold of pain’ for humans is approximately: