Quiz: Noise Pollution

1. Noise pollution can affect wildlife by:

2. 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?

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

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

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

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

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

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

9. The human hearing range is generally:

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

11. 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:

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

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

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

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

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

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

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

21. Sound intensity is measured in:

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

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

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

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