O-Net 2019

What is it about loud rock music that makes your ears ring after several hours at a concert or club? Does loud classical music have the same effect? Ringing in the ears is called tinnitus. In the circumstances described above, it can often be accompanied by a temporary loss of hearing known as (line 5) temporary threshold shift and indicates damage to the nerves of the inner ear caused by excessive noise exposure. The criterion is not the type of music listened to but the sound energy involved. Rock music, being prone to electric amplification, can generate high noise levels. This tends not to be the case with classical music. (line 10) Repeated exposure to high noise levels can lead to permanent and irreversible hearing damage, and because of this, noise in the workplace is subject to legislation, the maximum permitted exposure level being 90 dBA over an eight-hour shift. Damage of this nature tends to affect hearing mainly at a frequency of (line 15) about 4 kilohertz and presents a characteristic profile on an audiogram. This loss is insidious and may not be noticeable to the sufferer until natural hearing loss through aging begins to occur. At this point, hearing function may start to drop off sharply, and it is, unfortunately, far too late to do anything about it.  (line 20) It is best not to expose one's hearing to very high noise levels, but if it does occur, it is important to allow full recovery 16 hours before re-exposure to the sound. You may wonder if rock musicians suffer from this form of deafness; they do.  	According to the extract______.

1. Loud music can damage one's general health 2. Young people like to listen to rock music 3. Noise in the workplace should not exceed 90 dBA over an eighth-hour period 4. Classical music, as well as rock music, needs electric amplification 5. Hearing function drops off sharply when a person gets olde

Answer: 3. Noise in the workplace should not exceed 90 dBA over an eighth-hour period