Quiz: Noise Pollution

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

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

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

4. Sound intensity is measured in:

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

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

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

8. 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?

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

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

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

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

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

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

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

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

17. Sound with frequency below 20 Hz is termed:

18. The human hearing range is generally:

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

20. Noise pollution can affect wildlife by:

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

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

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

24. 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:

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