Part 7: Sense Organs – Ear (Structure, Hearing, Balance)
Part 7 (25 MCQs) on Sense Organs – Ear: Structure, Hearing, Balance from Chapter 21 – Neural Control and Coordination (NCERT Class 11 + NEET UG).
Part 7: Sense Organs – Ear (Structure, Hearing, Balance)
Q1. The human ear is concerned with:
a) Hearing only
b) Balance only
c) Both hearing and balance
d) Neither
Answer: c) Both hearing and balance
Explanation:
- ✅ (c) Ear functions in hearing (cochlea) and equilibrium (vestibular apparatus).
Q2. The outer ear consists of:
a) Pinna, auditory canal, eardrum
b) Eardrum, ossicles, cochlea
c) Cochlea and semicircular canals
d) Ossicles only
Answer: a) Pinna, auditory canal, eardrum
Explanation:
- ✅ (a) Outer ear collects and channels sound waves.
Q3. The middle ear contains:
a) Cochlea
b) Ossicles (malleus, incus, stapes)
c) Pinna
d) Auditory nerve
Answer: b) Ossicles (malleus, incus, stapes)
Explanation:
- ✅ (b) Ossicles amplify sound vibrations.
Q4. The smallest bone in human body is:
a) Incus
b) Malleus
c) Stapes
d) Tibia
Answer: c) Stapes
Explanation:
- ✅ (c) Stapes = smallest bone, transmits vibrations to oval window.
Q5. Eustachian tube connects:
a) Middle ear to inner ear
b) Middle ear to pharynx
c) Cochlea to brain
d) Ear to nose externally
Answer: b) Middle ear to pharynx
Explanation:
- ✅ (b) Maintains air pressure on both sides of eardrum.
Q6. Which structure transmits sound waves to inner ear?
a) Round window
b) Oval window
c) Cochlear duct
d) Vestibular nerve
Answer: b) Oval window
Explanation:
- ✅ (b) Stapes footplate presses on oval window → vibrations to cochlea.
Q7. The organ of Corti is present in:
a) Semicircular canals
b) Cochlea
c) Vestibule
d) Eustachian tube
Answer: b) Cochlea
Explanation:
- ✅ (b) Organ of Corti = sensory organ for hearing in cochlea.
Q8. Receptors for hearing are:
a) Rods and cones
b) Crista ampullaris
c) Organ of Corti hair cells
d) Macula
Answer: c) Organ of Corti hair cells
Explanation:
- ✅ (c) Hair cells in cochlea → sound reception.
Q9. Which fluid fills bony labyrinth of inner ear?
a) Perilymph
b) Endolymph
c) Plasma
d) CSF
Answer: a) Perilymph
Explanation:
- ✅ (a) Bony labyrinth = perilymph; membranous labyrinth = endolymph.
Q10. Which fluid fills membranous labyrinth?
a) Perilymph
b) Endolymph
c) Plasma
d) Synovial fluid
Answer: b) Endolymph
Explanation:
- ✅ (b) Endolymph fills membranous labyrinth.
Q11. The semicircular canals are concerned with:
a) Hearing
b) Static balance
c) Dynamic balance
d) Both hearing and balance
Answer: c) Dynamic balance
Explanation:
- ✅ (c) Semicircular canals detect angular acceleration → dynamic equilibrium.
Q12. The utricle and saccule are concerned with:
a) Hearing
b) Dynamic balance
c) Static balance
d) Reflexes
Answer: c) Static balance
Explanation:
- ✅ (c) Utricle and saccule detect head position and linear acceleration.
Q13. The auditory nerve is cranial nerve:
a) V
b) VII
c) VIII
d) IX
Answer: c) VIII
Explanation:
- ✅ (c) Vestibulocochlear nerve (VIII) = hearing and balance.
Q14. The scala media of cochlea is filled with:
a) Perilymph
b) Endolymph
c) Plasma
d) CSF
Answer: b) Endolymph
Explanation:
- ✅ (b) Scala media = cochlear duct filled with endolymph.
Q15. The scala vestibuli and scala tympani of cochlea are filled with:
a) Endolymph
b) Perilymph
c) Plasma
d) CSF
Answer: b) Perilymph
Explanation:
- ✅ (b) Surrounding chambers of cochlea filled with perilymph.
Q16. Which structure equalizes air pressure during altitude changes?
a) Cochlea
b) Eustachian tube
c) Oval window
d) Semicircular canal
Answer: b) Eustachian tube
Explanation:
- ✅ (b) Maintains pressure balance across tympanum.
Q17. Which membrane covers organ of Corti?
a) Tectorial membrane
b) Basilar membrane
c) Reissner’s membrane
d) Tympanic membrane
Answer: a) Tectorial membrane
Explanation:
- ✅ (a) Tectorial membrane lies over hair cells.
Q18. Which membrane supports the organ of Corti?
a) Tectorial membrane
b) Basilar membrane
c) Tympanic membrane
d) Reissner’s membrane
Answer: b) Basilar membrane
Explanation:
- ✅ (b) Organ of Corti rests on basilar membrane.
Q19. Which structure of ear converts sound vibrations into nerve impulses?
a) Tympanic membrane
b) Cochlea hair cells
c) Ossicles
d) Eustachian tube
Answer: b) Cochlea hair cells
Explanation:
- ✅ (b) Hair cells transduce mechanical sound into electrical signals.
Q20. Motion sickness is related to:
a) Eye
b) Ear (vestibular apparatus)
c) Nose
d) Spinal cord
Answer: b) Ear (vestibular apparatus)
Explanation:
- ✅ (b) Disturbance in semicircular canals causes motion sickness.
Q21. Deafness due to damage of auditory ossicles is:
a) Sensory neural deafness
b) Conductive deafness
c) Nerve deafness
d) Partial blindness
Answer: b) Conductive deafness
Explanation:
- ✅ (b) Ossicle damage → conduction pathway impaired.
Q22. Deafness due to damage of cochlea or auditory nerve is:
a) Conductive deafness
b) Sensory neural deafness
c) Mechanical deafness
d) Temporary deafness
Answer: b) Sensory neural deafness
Explanation:
- ✅ (b) Damage to inner ear or auditory nerve.
Q23. The hearing range of human ear is approximately:
a) 20–2000 Hz
b) 20–20,000 Hz
c) 2–200,000 Hz
d) 200–20,000 Hz
Answer: b) 20–20,000 Hz
Explanation:
- ✅ (b) Human ear hears ~20 Hz to 20 kHz.
Q24. The tympanic membrane is also called:
a) Oval window
b) Ear drum
c) Round window
d) Cochlear duct
Answer: b) Ear drum
Explanation:
- ✅ (b) Tympanic membrane vibrates in response to sound.
Q25. Which part of ear detects angular acceleration of head?
a) Cochlea
b) Utricle
c) Semicircular canals
d) Saccule
Answer: c) Semicircular canals
Explanation:
- ✅ (c) Semicircular canals detect angular movements.
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