Welcome Candidates! The General Science (Biology) section is highly important for those preparing for government jobs. Therefore, we are providing topic-wise General Science MCQs and notes on our website.
Continuing from the previous part, in this post, through [ Human Ear Objective Part 2 ] we will practice important questions frequently asked in previous exams from the topic ❛Sense Organs: Structure and Parts of the Human Ear❜. These will be very useful for UPSC, SSC, RRB, APPSC, TSPSC, and Police exams. So without any delay, let’s start the practice!
Table of Contents
Auditory Ossicles: Human Ear Objective Part 2
Eardrum and Auditory Ossicles
21. What is the thin membrane-like structure located at the end of the external auditory canal called?
Answer
✅ Answer: B) Tympanum
Explanation
Explanation: Sound waves passing through the auditory canal strike this thin membrane (Tympanum or Eardrum) and cause it to vibrate.
22. How many bones are there in the human ear in total?
Answer
✅ Answer: C) 6 (3 in each ear)
Explanation
Explanation: Each ear has three bones: Malleus, Incus, and Stapes. Including both ears, there are a total of 6 bones.
▫️ Malleus
23. Which ear bone is shaped like a hammer?
Answer
✅ Answer: C) Malleus
Explanation
Explanation: The first bone of the middle ear, ‘Malleus’, is attached to the eardrum. It looks like a hammer in shape.
▫️ Incus
24. Which ear bone is shaped like an anvil?
Answer
✅ Answer: B) Incus
Explanation
Explanation: This bone has the same shape as the anvil used by blacksmiths to strike iron. It is located between the malleus and the stapes.
▫️ Stapes
25. Which is the smallest bone in the human body?
Answer
✅ Answer: D) Stapes
Explanation
Explanation: The smallest and lightest bone in the human body is the ‘Stapes’. It is even smaller than a grain of rice.
Previous Year Question:
- 2015 – APPSC Group 2
- 2019 – RRB NTPC
26. To which part is the Stapes bone attached?
Answer
✅ Answer: C) Oval Window
Explanation
Explanation: One end of the stapes bone is attached to the incus and the other end is attached to the Oval Window leading to the inner ear, which transmits sound vibrations inward.
27. Which ear bone is shaped like a stirrup?
Answer
✅ Answer: C) Stapes
Explanation
Explanation: The stapes bone is shaped like the ‘stirrup’ used for placing the foot while mounting a horse.
Eustachian Tube
▫️ Eustachian Tube
28. Which tube connects the middle ear to the throat (pharynx)?
Answer
✅ Answer: B) Eustachian tube
Explanation
Explanation: The small tube that opens from the middle ear into the throat (pharynx) is called the Eustachian tube.
29. Which part helps in equalizing the air pressure on both sides of the eardrum?
Answer
✅ Answer: C) Eustachian tube
Explanation
Explanation: This Eustachian tube allows outside air to enter the middle ear, maintaining equal atmospheric pressure on both sides of the eardrum.
30. What is the reason for feeling like ears are popping or blocked while climbing high mountains or traveling in an airplane?
Answer
✅ Answer: C) Change in air pressure in Eustachian tube
Explanation
Explanation: Atmospheric pressure decreases at high altitudes. This creates a pressure difference between the middle ear and the outside air, causing the ears to feel blocked. Yawning opens this tube and equalizes the pressure.
Previous Year Question:
- 2020 – SSC CPO
31. Through which window is the middle ear connected to the inner ear?
Answer
✅ Answer: B) Oval window / Fenestra ovalis
Explanation
Explanation: The middle ear is connected to the inner ear through the oval window and the round window. The stapes bone is attached to the oval window.
4. Parts of Inner Ear
32. What is the ‘inner ear’, the main center of human hearing, called?
Answer
✅ Answer: C) Labyrinth
Explanation
Explanation: The inner ear is made up of very complex tubes, hence it is called the Labyrinth.
Previous Year Question:
- 2018 – RRB ALP
- 2021 – TSPSC Group 4
33. Which fluid is present in the membranous labyrinth of the inner ear?
Answer
✅ Answer: D) Endolymph
Explanation
Explanation: The labyrinth has two parts. The inner membranous labyrinth is filled with a fluid called ‘Endolymph’.
34. Which fluid is present in the bony labyrinth of the inner ear?
Answer
✅ Answer: C) Perilymph
Explanation
Explanation: The empty space between the bony labyrinth and the membranous labyrinth is filled with a fluid called ‘Perilymph’.
35. What is perilymph fluid similar to?
Answer
✅ Answer: B) CSF – Cerebrospinal fluid
Explanation
Explanation: In terms of chemical composition, perilymph fluid is similar to the cerebrospinal fluid (CSF) present in the brain and spinal cord.
36. Which part of the brain analyzes hearing?
Answer
✅ Answer: C) Temporal lobe
Explanation
Explanation: The electrical signals reaching the brain through the auditory nerve are analyzed by the temporal lobe of the cerebrum, which allows us to recognize the sound we are hearing.
37. Where are the sensory receptors related to hearing located?
Answer
✅ Answer: B) Organ of Corti
Explanation
Explanation: The ‘Organ of Corti’, located in the inner ear, contains microscopic hair cells. These are the actual auditory receptors that convert sound vibrations into nerve signals.
Previous Year Question:
- 2016 – SSC CHSL
- 2019 – APPSC Group 2
Cochlea
▫️ Cochlea
38. Which is the snail-shaped part in the inner ear?
Answer
✅ Answer: D) Cochlea
Explanation
Explanation: The cochlea is the part of the inner ear that is shaped like a coiled snail. It is the most important part in the process of hearing.
39. In which part is the ‘Organ of Corti’ located?
Answer
✅ Answer: B) Cochlea – Inner ear
Explanation
Explanation: The ‘Organ of Corti’, containing the sensor cells responsible for hearing, is located inside the cochlea of the inner ear.
40. How many chambers (Scalae) are there in the cross-section of the cochlea?
Answer
✅ Answer: B) 3
Explanation
Explanation: There are 3 sections or chambers inside the cochlear tube. They are: Scala Vestibuli, Scala Media, and Scala Tympani.
Candidates! In this post, we have practiced important questions related to Human Ear Objective Part 2. We hope these will be very useful for your upcoming competitive exams.
🔗 More Information: If you want to know more about the structure of the ear in detail, you can read on Wikipedia.
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