Quiz: Noise Pollution

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

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

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

4. Noise pollution can affect wildlife by:

5. 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:

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

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

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

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

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

11. The human hearing range is generally:

12. Sound with frequency below 20 Hz is termed:

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

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

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

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

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

21. Sound intensity is measured in:

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

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

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

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