Quiz: Noise Pollution

1. Noise pollution can affect wildlife by:

2. The human hearing range is generally:

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

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

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

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

7. 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:

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

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

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

11. Sound intensity is measured in:

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

13. 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?

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

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

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

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

18. Sound with frequency below 20 Hz is termed:

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

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

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

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

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

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

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