ENT – Physiology of Ear – Set 1
1. Ear sensitive to
a) 500-3500Hz
b) 1000-3000 Hz
c) 300-5000 Hz
d) 5000-8000 Hz
2.Impedence matching occurs
a) Difference of surface area of tympanic membrane and foot plate
b) Semicircular canal fluid
c) Utricle & Saccule
d) None
3. Ossicles of middle ear are responsible for which of the following ?
a) Amplification of sound intensity
b) Reduction of sound intensity
c) Protecting the inner ear
d) Reduction of impedance to sound transmission
4. Impedance denotes
a) Site of perforation
b) Disease of cochlea
c) Disease of ossicles
d) Higher function disorder
5. Function of ear ossicles is
a) Impedance matching
b) Amplification
c) Equilibrium
d) None
6. Mechanical advantage provided by lever action of malleus
a) 2:1
b) 1.3:1
c) 1.8:1
d) 1:1
7. Ossicular ratio is =____________________
a) 1.3:1
b) 1.2:1
c) 1.1:1
d) 1 :1
8. The effective diameter of the tympanic membrane –
a) 25 mm2
b) 30 mm2
c) 40 mm2
d) 45mm2
9. Surface area of tympanic membrance
a) 55 mm2
b)70mm2
c) 80 mm2
d)90mm2
10. Ratio of tympanic membrane to oval window is –
a) 17 : 1
b) 22 : 1
c) 50 : 1
d) 25 : 1
