HPL Q05 - The Ear, Hearing and Balance

Question 1

What level of sound can induce NIHL?

a.A sudden exposure to noise below 90db, continuous exposure to noise over 85db

b.A continuous exposure to noise below 65db and the ageing effect

c.One time exposure to noise above 120db, continuous exposure to noise over 85db

d.A continuous exposure to noise above 85db, sudden exposure to noise below 15db

Answer 1

c.One time exposure to noise above 120db, continuous exposure to noise over 85db

Question 2

The main function of the cochlea is

a.sensing angular acceleration

b.hearing

c.balance

d.equalising pressure between the outer and inner ear

Answer 2

b.hearing

Question 3

Angular accelerations are perceived by:

-the receptors in the skin and the joints.

-the otholiths.

-the cochlea.

-the semi circular canals.

Answer 3

-the semi circular canals.

Question 4

Motion sickness is made worse by

a.looking outside the cockpit at the horizon

b.maintaining a good instrument crosscheck

c.shaking the head from side to side

d.keeping the head steady against the back of the seat

Answer 4

c.shaking the head from side to side

Question 5

Noise induced hearing loss (NIHL) is caused by:
Select one:

-reduced mobility of the ossicles.

-a blocked Eustachian tube.

-damage to the sensitive membrane in the cochlea due to overexposure to noise.

-pressure differences on both sides of the eardrum

Answer 5

-damage to the sensitive membrane in the cochlea due to overexposure to noise.

Question 6

What is the main cause of conductive deafness?

a.Prolonged exposure to high frequency sounds such as turbine engine noise

b.A blockage of the outer or middle ear (e.g.wax) or fluid in the middle ear

c.A combination of lifestyle (e.g. smoking) and environmental factors (e.g. stress)

d.An infection of the inner ear that affects balance and hearing

Answer 6

b.A blockage of the outer or middle ear (e.g.wax) or fluid in the middle ear

Question 7

Which of the following describes the sequence of parts in the auditory system?

a.auditory canal, ear drum, ossicles, auditory nerve

b.external ear, ear drum, malleus, incus, stapes, vestibular nerve

c.auditory canal, oval window, ossicles, ear drum, eustachian nerve

d.outer ear, tympanic membrane, otoliths, saccules, eustachian nerve

Answer 7

a.auditory canal, ear drum, ossicles, auditory nerve

Question 8

Which one of the following is a symptom of motion sickness?
Select one:

-Influenza

-Chokes and bends

-Euphoria

-Apathy

Answer 8

-Apathy

Question 9

Which part of the vestibular system detects linear acceleration?

a.The cochlea

b.The otoliths

c.The semi-circular canals

d.The saccule

Answer 9

b.The otoliths

Question 10

How can the risk of noise-induced hearing loss (NIHL) be reduced?

a.by using noise cancelling headsets or earplugs

b.by regularly listening to loud music

c.by limiting exposure to noise in excess of 85db to no more than 5 hours

d.by ensuring the eustachian tube is not blocked

Answer 10

a.by using noise cancelling headsets or earplugs