Audiology and Speech Disorders — MCQs

A young man presents with an accident leading to loss of hearing in the right ear. On otoscopic examination, the tympanic membrane was intact. Pure tone audiometry shows an Air - Bone gap of 55 dB in the right ear with normal cochlear reserve. Which of the following will be the likely tympanometry finding?

Audiology and Speech Disorders Indian Medical PG Practice Questions and MCQs

Question 71: What is the frequency of the tuning fork commonly used for performing Rinne's test?

A. 256 Hz
B. 512 Hz (Correct Answer)
C. 1024 Hz
D. 2048 Hz

Explanation: **Explanation:** The **512 Hz tuning fork** is the standard instrument for clinical bedside hearing tests (Rinne’s and Weber’s) because it strikes the ideal balance between tactile vibration and auditory decay. **Why 512 Hz is the Correct Answer:** * **Speech Frequency Range:** It falls within the critical range of human speech (500 Hz to 2000 Hz), making it clinically relevant for assessing functional hearing. * **Minimal Overtones:** It produces a pure tone with a decay time long enough to allow the clinician to switch between mastoid (bone conduction) and ear canal (air conduction) positions. * **Avoidance of Pseudo-Auditory Stimuli:** Unlike lower frequencies, it does not produce significant "vibrotactile" sensations, ensuring the patient responds to sound rather than touch. **Why Other Options are Incorrect:** * **256 Hz:** While used in neurology to test vibration sense, it is avoided in audiology because it produces a strong **vibrotactile sensation**. A patient with profound hearing loss might feel the vibration and mistakenly report it as hearing (False Negative). * **1024 Hz & 2048 Hz:** These higher frequencies have a very **short decay time**. The sound fades too quickly to perform a reliable comparison between air and bone conduction, and they are more prone to producing "overtones." **High-Yield Clinical Pearls for NEET-PG:** * **Rinne’s Test:** A "Positive Rinne" (AC > BC) is normal or indicates sensorineural hearing loss. A "Negative Rinne" (BC > AC) indicates conductive hearing loss of at least **15–20 dB**. * **Weber’s Test:** Lateralizes to the **poorer ear** in conductive loss and the **better ear** in sensorineural loss. * **Material:** Tuning forks are ideally made of **aluminum** or magnesium alloys to ensure a pure tone and longer ring time.

Question 72: The Rinne test is positive in which of the following conditions?

A. Normal hearing (Correct Answer)
B. Sensorineural deafness
C. Conductive deafness
D. All of the above

Explanation: **Explanation:** The **Rinne test** is a tuning fork test (using 512 Hz) that compares Air Conduction (AC) with Bone Conduction (BC). 1. **Why Option A is correct:** In a **Normal hearing** individual, the middle ear apparatus amplifies sound, making AC more efficient than BC. Therefore, **AC > BC**, which is clinically termed a **"Positive Rinne."** 2. **Why Option B is also technically correct (Clinical Context):** In **Sensorineural Hearing Loss (SNHL)**, both AC and BC are reduced proportionately. However, since the conducting mechanism is intact, AC remains better than BC (**AC > BC**). This is also called a **Positive Rinne**. *Note: In many exams, "Normal" and "SNHL" both yield a positive result; however, if forced to choose the most definitive physiological state, "Normal" is the primary baseline.* 3. **Why Option C is incorrect:** In **Conductive Hearing Loss (CHL)**, there is a defect in the sound-conducting mechanism (e.g., ASOM, wax, otosclerosis). Consequently, BC becomes better than AC (**BC > AC**), which is termed a **"Negative Rinne."** **High-Yield Clinical Pearls for NEET-PG:** * **False Negative Rinne:** Seen in **Unilateral Severe/Profound SNHL**. The patient appears to have BC > AC because the sound travels through the skull and is perceived by the *opposite* (better) ear. * **Minimum Air-Bone Gap:** A Rinne test typically becomes negative only when the air-bone gap is at least **15–20 dB**. * **Weber Test:** Always interpret Rinne with Weber. In SNHL, Weber lateralizes to the **better** ear; in CHL, it lateralizes to the **worse** ear.

Question 73: A patient hears better in noise. What is the diagnosis?

A. Hyperacusis
B. Hypoacusis
C. Presbyacusis
D. Paracusis (Correct Answer)

Explanation: **Explanation:** The phenomenon where a patient hears better in a noisy environment is known as **Paracusis Willisii**. This is a classic clinical feature of **Otosclerosis**. **Why Paracusis is the correct answer:** In patients with conductive hearing loss (specifically Otosclerosis), the background noise masks low-frequency sounds for people with normal hearing. Consequently, people around the patient tend to speak louder to be heard over the noise. Since the patient has a conductive barrier that filters out the ambient low-frequency background noise, they perceive the increased volume of the speaker's voice more clearly than they would in a quiet room. **Analysis of Incorrect Options:** * **Hyperacusis:** This is an abnormal sensitivity to ordinary environmental sounds, often perceived as painfully loud. It is commonly seen in Bell’s palsy (due to stapedius muscle paralysis). * **Hypoacusis:** A general term for reduced hearing acuity or hearing loss of any type. * **Presbyacusis:** This is age-related sensorineural hearing loss. Patients with presbyacusis typically hear **worse** in noise because they lose the ability to discriminate speech frequencies against background interference (the "cocktail party effect"). **High-Yield Clinical Pearls for NEET-PG:** * **Paracusis Willisii** is a pathognomonic sign of **Otosclerosis**. * **Schwartz Sign:** A flamingo-pink flush seen on the promontory through the tympanic membrane, indicating active otosclerosis. * **Carhart’s Notch:** A characteristic dip in the bone conduction threshold at **2000 Hz** seen on an Audiogram in Otosclerosis. * **Gelle’s Test:** Used to differentiate ossicular fixation from a mobile chain; it is negative in Otosclerosis.

Question 74: What is the investigation of choice for audiometric evaluation of an infant?

A. Pure Tone Audiometry
B. High Frequency Audiometry
C. Tympanometry
D. Brainstem Evoked Response Audiometry (BERA) (Correct Answer)

Explanation: **Explanation:** The investigation of choice for audiometric evaluation in infants is **Brainstem Evoked Response Audiometry (BERA)**, also known as ABR (Auditory Brainstem Response). **Why BERA is the Correct Choice:** Infants are "pre-verbal" and cannot provide subjective feedback. BERA is an **objective, non-invasive electrophysiological test** that measures the electrical activity of the auditory pathway from the cochlea to the brainstem in response to sound stimuli. Since it does not require the patient’s active participation or a conscious response, it is the gold standard for assessing hearing thresholds in newborns and infants. **Analysis of Incorrect Options:** * **A & B. Pure Tone/High Frequency Audiometry:** These are **subjective** tests. They require the patient to understand instructions and signal when they hear a sound (e.g., raising a hand). This is impossible for infants, making these tests suitable only for children above 3–5 years of age. * **C. Tympanometry:** This evaluates the **middle ear function** and compliance of the tympanic membrane. While useful for diagnosing Otitis Media with Effusion, it does not measure hearing sensitivity or the integrity of the neural pathway. **Clinical Pearls for NEET-PG:** * **Universal Neonatal Hearing Screening (UNHS):** Usually follows a two-step protocol: **OAE (Otoacoustic Emissions)** for initial screening, followed by **BERA** for confirmation if the screening is failed. * **BERA Waves:** Remember the sites of origin: Wave I (Distal Auditory Nerve), Wave II (Proximal Auditory Nerve), Wave III (Cochlear Nucleus), Wave IV (Superior Olivary Complex), and **Wave V (Lateral Lemniscus/Inferior Colliculus)**. Wave V is the most stable wave used to determine hearing thresholds. * **ASSR (Auditory Steady-State Response):** A newer objective test that can provide more frequency-specific information than standard BERA in cases of profound hearing loss.

Question 75: Rinne test is negative in which of the following conditions?

A. Sensorineural deafness
B. Acoustic neuroma
C. Tympanosclerosis (Correct Answer)
D. Meniere's disease

Explanation: **Explanation:** The **Rinne test** is a tuning fork test (usually 512 Hz) used to compare Air Conduction (AC) and Bone Conduction (BC). * **Rinne Positive (Normal/Sensorineural):** AC > BC. * **Rinne Negative (Conductive):** BC > AC. **Why Tympanosclerosis is correct:** Tympanosclerosis involves hyalinization and calcification of the tympanic membrane or middle ear structures (like the ossicles). This creates a physical barrier to sound transmission through the external and middle ear, resulting in **Conductive Hearing Loss (CHL)**. In CHL, bone conduction bypasses the middle ear pathology, making BC louder than AC, thus yielding a **Negative Rinne test**. **Why the other options are incorrect:** * **Sensorineural Deafness (A):** In SNE, both AC and BC are reduced, but the relative efficiency of the middle ear remains intact. Therefore, AC remains better than BC (Rinne Positive). * **Acoustic Neuroma (B):** This is a retrocochlear lesion affecting the VIIIth cranial nerve. It causes sensorineural hearing loss, resulting in a Rinne Positive test. * **Meniere’s Disease (D):** This is an inner ear disorder (endolymphatic hydrops) causing sensory hearing loss. Like other sensorineural conditions, it presents with a Rinne Positive test. **High-Yield Clinical Pearls for NEET-PG:** 1. **False Negative Rinne:** Occurs in severe unilateral SNHL. The patient "hears" the vibration in the non-test ear via bone conduction, leading the clinician to believe BC > AC in the affected ear. 2. **Sensitivity:** A Rinne test typically becomes negative only when there is an **air-bone gap of at least 15–20 dB**. 3. **Weber Test:** Always interpret Rinne with Weber. In conductive loss, Weber lateralizes to the **poorer** ear; in sensorineural loss, it lateralizes to the **better** ear.

Question 76: What is the typical sound intensity level of a whisper?

A. 10 dB
B. 20-30 dB (Correct Answer)
C. 30-50 dB
D. 60 dB

Explanation: **Explanation:** In audiology, sound intensity is measured on a logarithmic scale using decibels (dB). Understanding the standard intensity levels of common environmental sounds is high-yield for NEET-PG, as it forms the basis for interpreting audiograms and assessing hearing loss. **1. Why 20-30 dB is Correct:** A **whisper** typically falls within the range of **20 to 30 dB**. In clinical practice, the "Whisper Voice Test" is used as a bedside screening tool; a patient who cannot hear a whisper at 2 feet may have a hearing threshold higher than 30 dB, indicating a potential hearing impairment. **2. Analysis of Incorrect Options:** * **A. 10 dB:** This represents a very faint sound, such as rustling leaves or the sound of normal breathing. It is near the threshold of human hearing but quieter than a functional whisper. * **C. 30-50 dB:** This range represents a quiet office or a library. While the upper end (50 dB) is sometimes associated with very soft speech, it is generally louder than a standard whisper. * **D. 60 dB:** This is the standard intensity for **normal conversational speech**. This is a frequent "distractor" in exams; remember that normal conversation is roughly twice as loud (on the dB scale) as a whisper. **Clinical Pearls for NEET-PG:** * **Threshold of Pain:** 120–130 dB (e.g., a jet engine or rock concert). * **Reference Level:** 0 dB is the reference point (threshold of hearing), not the absence of sound. * **Speech Frequency:** Most speech sounds fall between 500 Hz and 2000 Hz (the "speech banana" on an audiogram). * **Rule of 6:** In sound pressure level, doubling the distance from the source decreases the intensity by 6 dB.

Question 77: A B-type tympanogram is typically seen in which of the following conditions?

A. Serous otitis media (Correct Answer)
B. Ossicular discontinuity
C. Otosclerosis
D. All of the above

Explanation: **Explanation:** Tympanometry measures the compliance of the tympanic membrane (TM) and the middle ear system under varying air pressure. A **Type B tympanogram** is a "flat" curve with no discernible peak, indicating that the TM is immobile or its movement is severely restricted. **1. Why Serous Otitis Media (SOM) is correct:** In SOM (Otitis Media with Effusion), the middle ear is filled with fluid instead of air. This fluid creates significant resistance, preventing the TM from vibrating regardless of the pressure applied. Since there is no point of maximum compliance, a flat (Type B) curve is produced. Note: A Type B with **normal ear canal volume** suggests fluid; a Type B with **large volume** suggests a TM perforation or a patent grommet. **2. Why other options are incorrect:** * **Ossicular Discontinuity:** This results in a **Type $A_d$** (deep/disconnected) tympanogram. The TM is highly compliant because it is no longer tethered by the ossicular chain, leading to an off-the-chart peak. * **Otosclerosis:** This results in a **Type $A_s$** (shallow/stiff) tympanogram. The fixation of the stapes footplate increases the stiffness of the system, leading to a peak at normal pressure but with reduced amplitude (low compliance). **Clinical Pearls for NEET-PG:** * **Type A:** Normal middle ear function. * **Type C:** Peak at negative pressure (>-100 daPa); indicates **Eustachian tube dysfunction**. * **Type B + Large Volume:** TM Perforation. * **Type B + Small Volume:** Wax bolus or probe against the canal wall. * **Acoustic Reflex:** Usually absent in Type B tympanograms due to the presence of middle ear fluid.

Question 78: Which of the following viruses does NOT cause hearing loss?

A. Measles
B. Mumps
C. Rubella
D. Rotavirus (Correct Answer)

Explanation: **Explanation:** The correct answer is **Rotavirus**. Hearing loss caused by viral infections is typically due to direct damage to the inner ear structures (cochlea or auditory nerve) or an inflammatory response within the labyrinth. **Why Rotavirus is the correct answer:** Rotavirus is a double-stranded RNA virus that primarily infects the enterocytes of the small intestine, leading to severe gastroenteritis. It does not exhibit neurotropism or the ability to invade the inner ear; therefore, it is not associated with sensorineural hearing loss (SNHL). **Analysis of incorrect options:** * **Measles (Rubeola):** Causes severe bilateral SNHL. The virus reaches the inner ear via the bloodstream, leading to permanent damage to the Organ of Corti. * **Mumps:** Historically one of the most common causes of **unilateral** Sausalito SNHL in children. It causes endolymphatic labyrinthitis. The hearing loss is often sudden and profound. * **Rubella:** A classic cause of congenital SNHL. If a mother is infected during the first trimester, the virus interferes with the development of the cochlea (Scheibe dysplasia), leading to the "Cookie-bite" audiogram pattern. **High-Yield Clinical Pearls for NEET-PG:** * **Most common viral cause of congenital SNHL:** Cytomegalovirus (CMV). * **Most common viral cause of acquired unilateral SNHL:** Mumps. * **Labyrinthitis vs. Neuronitis:** Viral labyrinthitis presents with both hearing loss and vertigo, whereas vestibular neuronitis presents with vertigo only (hearing is preserved). * **Ramsay Hunt Syndrome:** Caused by Herpes Zoster Oticus; presents with facial palsy, vesicles on the auricle, and SNHL/vertigo.

Question 79: A 58-year-old man has a positive Rinne test. What is the most likely diagnosis?

A. Impacted earwax
B. Chronic suppurative otitis media
C. Otomycosis
D. Normal hearing (Correct Answer)

Explanation: ### Explanation The **Rinne test** is a tuning fork test (typically 512 Hz) used to compare air conduction (AC) with bone conduction (BC). **1. Why "Normal hearing" is correct:** A **Positive Rinne test** occurs when **Air Conduction is better than Bone Conduction (AC > BC)**. This is the physiological state of a healthy ear because the middle ear apparatus (ossicles) amplifies sound waves. A positive result is seen in two scenarios: * **Normal hearing:** Both AC and BC are within normal limits, but AC remains superior. * **Sensorineural Hearing Loss (SNHL):** Both AC and BC are reduced, but the relative efficiency of the middle ear is preserved, so AC > BC (often called a "False Positive" or "Pathological Positive" in clinical contexts, though technically still a positive Rinne). **2. Why the other options are incorrect:** * **Impacted earwax (A), Chronic suppurative otitis media (B), and Otomycosis (C):** All three conditions cause **Conductive Hearing Loss (CHL)**. In CHL, the sound cannot reach the inner ear efficiently through the air, but the cochlea remains functional. Therefore, bone conduction becomes better than or equal to air conduction (**BC ≥ AC**), resulting in a **Negative Rinne test**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Negative Rinne:** Indicates a conductive gap of at least **15–20 dB**. * **False Negative Rinne:** Seen in **unilateral profound SNHL**. The patient appears to hear better by bone because the sound travels through the skull to the *opposite* (healthy) ear. * **Weber Test:** Always interpret Rinne with Weber. In SNHL, Weber lateralizes to the **better** ear; in CHL, Weber lateralizes to the **worse** (affected) ear. * **Standard Fork:** The **512 Hz** tuning fork is preferred as it provides the best balance between tone decay and tactile vibration.

Question 80: A young man presents with an accident leading to loss of hearing in the right ear. On otoscopic examination, the tympanic membrane was intact. Pure tone audiometry shows an Air - Bone gap of 55 dB in the right ear with normal cochlear reserve. Which of the following will be the likely tympanometry finding?

A. As type tympanogram
B. Ad type tympanogram (Correct Answer)
C. B type tympanogram
D. C type tympanogram

Explanation: ### Explanation **Concept:** The patient presents with post-traumatic conductive hearing loss (CHL) characterized by an intact tympanic membrane and a significant **Air-Bone (A-B) gap of 55 dB**. In clinical audiology, an A-B gap exceeding 50 dB is a classic indicator of **Ossicular Discontinuity** (e.g., incudostapedial joint dislocation). When the ossicular chain is broken, the middle ear system loses its stiffness and becomes "hypermobile" or overly compliant. **Why Ad is Correct:** * **Type Ad (Deep/Disconnected):** This tympanogram shows a very high peak (high compliance) at normal atmospheric pressure. It occurs when the tympanic membrane or ossicles move too freely. In this case, the trauma caused ossicular disruption, leading to this hypermobile pattern. **Why Other Options are Incorrect:** * **Type As (Stiff/Sclerotic):** Shows a shallow peak at normal pressure. It is seen in conditions that increase the stiffness of the system, such as **Otosclerosis** or tympanosclerosis. * **Type B (Flat):** No peak is seen. This indicates restricted mobility, typically due to **Otitis Media with Effusion** (fluid behind the drum) or a perforated TM. * **Type C (Negative Pressure):** The peak is shifted to the left (negative pressure). This indicates **Eustachian tube dysfunction**, often seen in the early stages of ASOM or resolving URIs. **Clinical Pearls for NEET-PG:** 1. **Maximum A-B Gap:** The maximum possible conductive hearing loss with an intact TM is approximately **60 dB** (seen in ossicular dissociation). If the gap is only 25–30 dB, consider a simple TM perforation. 2. **Carhart’s Notch:** A dip in bone conduction at 2000 Hz, characteristic of Otosclerosis (Type As tympanogram). 3. **Trauma Triad:** Longitudinal temporal bone fractures often present with ossicular disruption (Ad), while transverse fractures often involve the labyrinth, leading to SNHL.

Practice by Chapter

Hearing Assessment Techniques

Practice Questions

Tympanometry and Acoustic Reflexes

Practice Questions

Otoacoustic Emissions

Practice Questions

Auditory Brainstem Response

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Hearing Aids

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Cochlear Implants

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Bone-Anchored Hearing Devices

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Speech and Language Development

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Articulation Disorders

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Stuttering

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Dysphonia

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Rehabilitation of Hearing-Impaired Children

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