Theme 5

Question 1

What are the factors that affect visibility? (4)

Answer 1

1. Angle
2. Brightness
3. Color
4. Glare

Question 2

What are the types of glare? (3)

Answer 2

1. Discomfort glare: observer annoyed but not inhibited from task
2. Disability glare: observer is annoyed and performance is reduced
3. Blinding glare: temporarily blinding to observer

Question 3

How can hearing loss be classified? (3)

Answer 3

1. Temporary threshold shift: hearing impairment of short duration, effect is reversible.
2. Noise-induced permanent threshold shift: not reversible due to long-term exposure
3. Acoustic trauma: hearing loss caused by single exposure to very high intensity noise of short duration, loss can be temporary / permanent.

Question 4

What are the measurements of sound? (3)

Answer 4

1. Sound level meter
2. Integrating sound level meter
3. Noise dosimeter

Question 5

What are the ways of controlling noise? (2)

Answer 5

1. Administrative controls

2. Engineering controls

Question 6

What are the levels at which noise can be mechanically reduced? (3)

Answer 6

1. At source
2. At receiver e.g. provide ear protection for workers
3. Along path between source and receiver