Nervous System

Total Questions: 39

21. Which of the following is the largest part of the human brain? [S.S.C. Online CHSL (T-I) 23.01.2017 (Shift-I)]

(a) Ribs
(b) Cerebrum
(c) Pons
(d) Thalamus

Correct Answer: (b) Cerebrum

Solution:The cerebrum is part of the forebrain and accounts for about two-thirds of the entire brain. It controls most of the voluntary movements and functions such as thinking, intelligence, memory, and learning ability.

22. The shape of the outer part of the ear is like: [S.S.C. Online Graduate Level (T-I) 22.08.2017 (Shift-III)]

(a) Funnel
(b) Plate
(c) Drum
(d) Disc

Correct Answer: (a) Funnel

Solution:The outer part of the ear, called the auricle or pinna, is shaped like a funnel. This shape helps to collect sound waves from the environment and direct them into the ear canal.

23. Which of these bones is NOT a part of the human ear? [S.S.C. Online Graduate Level (T-I) 3.03.2020 (Shift-I)]

(a) Stapes
(b) Malleus
(c) Incus
(d) Femur

Correct Answer: (d) Femur

Solution:There are three tiny bones in the middle ear of a human. These are the malleus or hammer, the incus or anvil, and the stapes or stirrup. The femur is the only bone located within the human thigh. It is both the longest and strongest bone in the human body.

24. Hammer, anvil, and stirrup are all parts of the human: [S.S.C. JE Mechanical Exam 22.03.2021 (Shift-II)]

(a) Nose
(b) Stomach
(c) Ear
(d) Heart

Correct Answer: (c) Ear

Solution:The human ear is divided into three parts: the outer ear, the middle ear, and the inner ear. There are three small bones in the middle ear, which are called the hammer or malleus, the anvil or incus, and the stirrup or stapes. Hence, hammer, anvil, and stirrup are all parts of the human ear.

25. Which part of the human ear receives sound from the surrounding environment? [S.S.C. Online MTS (T-1) 16.08.2019 (Shift-III)]

(a) Pinna
(b) Anvil
(c) Cochlear
(d) Hammer

Correct Answer: (a) Pinna

Solution:The auricle (pinna) is the visible portion of the outer ear. It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified. The sound waves then travel toward a flexible, oval membrane at the end of the ear canal called the eardrum, or tympanic membrane.

26. ______ collects the sound from the surroundings. [S.S.C. Online Constable GD 14.02.2019 (Shift-III)]

(a) Cochlear (cochlea)
(b) Auricle (Pinna)
(c) Auditory nerve
(d) Ear curtain

Correct Answer: (b) Auricle (Pinna)

27. Which of the following body parts behaves like a stretched rubber sheet? [S.S.C. Online CGL (T-I) 23.08.2021 (Shift-III)]

(a) Nostril
(b) Eardrum
(c) Eye lens
(d) Tongue

Correct Answer: (b) Eardrum

Solution:The eardrum (tympanic membrane) is a thin, taut membrane that vibrates when sound waves strike it, much like a stretched rubber sheet or the head of a drum. These vibrations are then transmitted to the middle ear bones.

Nostril: Opening for breathing.
Eye lens: Focuses light, but doesn't vibrate like a stretched sheet.
Tongue: Muscular organ for taste and speech.

28. Eustachian Tube is located in which part of the human body? [S.S.C. Online Graduate Level (T-1) 3.09.2016 (Shift-III)]

(a) Nose
(b) Ear
(c) Eyes
(d) Throat

Correct Answer: (b) Ear

Solution:The Eustachian tube (also called the auditory tube) connects the middle ear to the nasopharynx (the upper part of the throat and back of the nasal cavity). It is crucial for equalizing pressure between the middle ear and the outside atmosphere.

Nose: While it connects to the nasal cavity, its primary association is with the ear.
Eyes: No connection.
Throat: Connects to the throat (nasopharynx), but its function is related to the ear.

29. The ______ helps in equalising the pressure on either sides of the eardrum. [S.S.C. Online Graduate Level (T-1) 3.03.2020 (Shift-III)]

(a) eustachian tube
(b) incus
(c) malleus
(d) cochlear nerve

Correct Answer: (a) eustachian tube

Solution:A canal that links the middle ear with the back of the nose. The Eustachian tube helps to equalize the pressure in the middle ear. Equalized pressure is needed for the proper transfer of sound waves. The Eustachian tube is lined with mucous, just like the inside of the nose and throat.

30. Medullaoblongata is a part of which of the following? [S.S.C. Online CHSL (T-1) 10.01.2017 (Shift-II)]

(a) Heart
(b) Brain
(c) Lungs
(d) Stomach

Correct Answer: (b) Brain

Solution:The medulla oblongata is the lowest part of the brainstem, which connects the brain to the spinal cord. It controls vital involuntary functions.

Heart: An organ of the circulatory system.
Lungs: Organs of the respiratory system.
Stomach: Organ of the digestive system.

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