Which of the following materials is known to reflect sound?

The material known to reflect sound is rubber tiles. This is due to the properties of rubber, which has high elasticity and density, making it effective at reflecting sound waves rather than absorbing them. When sound waves encounter rubber tiles, the material's structure causes the waves to bounce off rather than be soaked up, which can contribute to sound clarity and reduce echo in a space.

In contrast, heavy drapes, carpets with felt pads, and rugs are designed to absorb sound. Textiles such as these are porous and fibrous, allowing them to capture sound waves effectively, which helps in reducing noise levels in a room. Their sound-absorbing qualities make them useful in environments where noise reduction is desirable, such as in theaters, recording studios, or homes wanting to minimize sound reverberation. Thus, rubber tiles stand out as a material that reflects sound, while the other options focus on absorption.