5.1 Noise

Which is a basic noise control measure at the source?

• 1 Signs
• 2 Earmuffs
• 3 Silencing or damping
• 4 Rotating workers

dB(A) is a scale:

• 1 For radiation
• 2 For temperature
• 3 Used for vibration
• 4 Weighted to match the human ear

A limitation of hearing protection is:

• 1 It improves communication
• 2 Poor fit and discomfort can reduce use
• 3 It never needs replacing
• 4 It removes noise completely

Noise damage to hearing is often not noticed at first because it is:

• 1 Always temporary
• 2 Always limited to one ear
• 3 Gradual and painless
• 4 Always sudden and painful

Tinnitus is:

• 1 A type of hearing protection
• 2 A decibel scale
• 3 A noise measurement
• 4 Ringing in the ears

The decibel scale is logarithmic, which means that:

• 1 A small rise in dB is a large rise in energy
• 2 It cannot be measured
• 3 Each dB is the same energy
• 4 It applies only to vibration

The unit of frequency is the:

• 1 Decibel
• 2 Lux
• 3 Pascal
• 4 Hertz

dB(C) is mainly used to measure:

• 1 Light levels
• 2 Peak or very loud sounds
• 3 Vibration
• 4 Sounds of low importance

A rough prompt that a noise problem may exist is when people:

• 1 Work for more than one hour
• 2 Have a lunch break
• 3 Wear a hat
• 4 Have to raise their voices to talk normally at about two metres apart

Noise exposure at work is judged:

• 1 By the number of machines only
• 2 By a single reading at the loudest machine
• 3 Over a working day or week, not by one reading at one machine
• 4 By asking workers if they like the noise

After eliminating or reducing noise at source, further controls include:

• 1 Only earplugs
• 2 Only warning signs
• 3 Only longer hours
• 4 Enclosure, absorption, insulation, damping and silencing

Which type of hearing protection has to be chosen according to the attenuation needed?

• 1 Earmuffs and earplugs
• 2 Hard hats
• 3 Gloves
• 4 Safety glasses

Hearing tests for workers in noisy areas are an example of:

• 1 Isolation
• 2 Eliminating the noise
• 3 Substitution
• 4 Health surveillance

Which is a limit of hearing protection?

• 1 It removes the noise at source
• 2 It lasts for ever
• 3 It needs no fitting
• 4 It may make it hard to hear warnings

Which control for noise does not rely on the worker wearing something?

• 1 Earplugs
• 2 Enclosing the noisy machine
• 3 Instruction to wear protection
• 4 Earmuffs