NCIDQ IDFX Practice Exam

Which factors can increase noise reduction in a space?

1. Only increasing area of the wall

2. Only reducing the size of doors

3. More absorption in the quiet room

4. Only choosing lighter materials

The correct answer is: More absorption in the quiet room

Increasing noise reduction in a space can significantly be achieved by enhancing the absorption qualities within the quiet room. When sound waves encounter soft, porous materials like carpets, upholstered furniture, or acoustic panels, they are absorbed rather than reflected. This process effectively diminishes noise levels, creating a more tranquil environment. Therefore, adding more absorption materials in a room directly contributes to an increase in noise reduction by mitigating sound reflections and reverberation. While there are various strategies to help with noise control, such as changing the structure of walls or the dimensions of doors, they may not universally apply to all scenarios. For example, merely increasing the wall area may not improve sound absorption without the inclusion of suitable materials. Similarly, while lighter materials may affect sound transmission, they are not inherently designed for noise reduction unless they specifically promote sound absorption or blocking.