Audiology and Speech Disorders Practice Questions

Q: What is the standard frequency used in tympanometry?

220 Hz. **Explanation:** Tympanometry is an objective test of middle ear function that measures **acoustic admittance** (the ease with which sound energy flows into the middle ear) as air pressure in the external canal is varied. **Why 220 Hz is the Correct Answer:** In standard clinical practice for adults, a **low-frequency probe tone of 220 Hz** (or 226 Hz) is used. This frequency is chosen because, at 220 Hz, the middle ear is primarily **stiffness-dominated**. Since most common middle ear pathologies (like otitis media with effusion or otosclerosis) significantly alter the stiffness of the system, this frequency is most sensitive for detecting these changes. Additionally, at 226 Hz, the acoustic admittance in mmhos is numerically equal to the equivalent volume of air in cubic centimeters (cm³), simplifying the calibration. **Analysis of Incorrect Options:** * **A. 256 Hz:** This is a common frequency for clinical **tuning fork tests** (like Rinne or Weber), but it is not the standard probe tone for tympanometry. * **C. 222 Hz:** This is a distractor value close to the correct frequency but is not the standardized clinical norm. * **D. 440 Hz:** This is the musical "Standard A" pitch. While higher frequencies are used in multi-frequency tympanometry, 440 Hz is not the standard for routine screening. **High-Yield Clinical Pearls for NEET-PG:** * **Infant Exception:** In infants under 6 months, a **1000 Hz** probe tone must be used. A 220 Hz tone is inaccurate in neonates because their ear canals are highly compliant (floppy), which can produce a false-normal Type A curve even in the presence of fluid. * **Type B Curve:** Flat trace (seen in fluid or TM perforation). * **Type C Curve:** Negative peak pressure (seen in Eustachian tube dysfunction). * **Type As/Ad:** Shallow (Otosclerosis) vs. Deep (Ossicular discontinuity).

Q: In right-sided middle ear pathology, what will be the finding in Weber's test?

Lateralized to the right side. ### Explanation **Underlying Medical Concept** Weber’s test is a tuning fork test (using 512 Hz) that assesses bone conduction. In a normal individual, the sound is heard equally in both ears (centralized). However, in **Conductive Hearing Loss (CHL)**—such as middle ear pathology—the sound **lateralizes to the affected ear**. This occurs because of two main reasons: 1. **Masking Effect:** In the diseased ear, ambient room noise is blocked by the pathology (e.g., fluid or ossicular fixation), making the ear more sensitive to the bone-conducted vibrations of the tuning fork. 2. **Occlusion Effect:** The pathology prevents the escape of sound energy from the external auditory canal, reflecting it back to the cochlea. Since the question specifies **right-sided middle ear pathology** (a conductive defect), the sound will be heard louder in the **right ear**. **Analysis of Options** * **Option A & B (Normal/Centralized):** These are the findings in a healthy individual or someone with symmetrical hearing. * **Option D (Lateralized to the left side):** This would occur if the patient had Sensorineural Hearing Loss (SNHL) in the right ear or CHL in the left ear. In SNHL, the sound lateralizes to the **better-hearing** ear. **Clinical Pearls for NEET-PG** * **Weber’s Test Rule of Thumb:** Lateralizes to the **Worse** ear in CHL; lateralizes to the **Better** ear in SNHL. * **Rinne’s Test:** Usually performed alongside Weber's. In middle ear pathology, Rinne’s will be **Negative** (Bone Conduction > Air Conduction). * **High-Yield Combo:** A patient with a **Negative Rinne on the right** and **Weber lateralized to the right** definitively has Right Conductive Hearing Loss.

Q: In which of the following conditions is the threshold for bone conduction normal and the threshold for air conduction increased?

Middle ear disease. ### Explanation The question describes a classic **Air-Bone Gap (ABG)**, which is the hallmark of **Conductive Hearing Loss (CHL)**. **1. Why Middle Ear Disease is Correct:** In Conductive Hearing Loss, the pathology lies in the external or middle ear (e.g., Otitis Media, Otosclerosis, or impacted wax). These structures are responsible for conducting sound waves to the cochlea. * **Air Conduction (AC):** Increased threshold (poor hearing) because the sound must pass through the diseased middle ear. * **Bone Conduction (BC):** Normal threshold because the bone vibrator bypasses the middle ear and stimulates the cochlea directly. If the cochlea is healthy, BC remains normal. **2. Why the Other Options are Incorrect:** * **Inner Ear Disease (B) & Cochlear Nerve Lesion (C):** These cause **Sensorineural Hearing Loss (SNHL)**. In SNHL, both AC and BC thresholds are increased (poor) to a similar degree, meaning there is no Air-Bone Gap. * **Temporal Lobe Lesion (D):** This represents a **Central Auditory Pathway** lesion. Pure tone audiometry (AC and BC) is often surprisingly normal or shows complex processing deficits rather than a simple threshold shift, as the primary auditory cortex is involved in interpretation rather than basic sound detection. **3. NEET-PG High-Yield Pearls:** * **Air-Bone Gap:** Defined as a difference of **>15 dB** between AC and BC thresholds. * **Carhart’s Notch:** A specific dip in the BC threshold at **2000 Hz** seen in Otosclerosis (a middle ear disease), which disappears after stapedectomy. * **Rinne Test:** In middle ear disease (CHL), the Rinne test is **Negative** (BC > AC). * **Weber Test:** Lateralizes to the **poorer ear** in CHL and to the **better ear** in SNHL.

Q: An audiometry report is provided. Interpret the audiogram to determine the most probable diagnosis.

Conductive hearing loss, right ear. ***Conductive hearing loss, right ear*** - **Air-bone gap >10 dB** in the right ear indicates conductive hearing loss, with **air conduction thresholds** elevated while **bone conduction** remains normal or near-normal. - **Symbols on audiogram**: Right ear uses **red O for air conduction** and **red [ for bone conduction**, showing the characteristic gap pattern. *Conductive hearing loss, left ear* - The **left ear symbols** (blue X for air conduction, blue ] for bone conduction) would show **normal thresholds** or minimal air-bone gap. - **No significant conductive component** is present in the left ear based on audiogram interpretation. *Sensorineural hearing loss, right ear* - In **sensorineural hearing loss**, both **air and bone conduction thresholds** are equally elevated with **no air-bone gap**. - The right ear shows **preserved bone conduction** with elevated air conduction, ruling out sensorineural pathology. *Sensorineural hearing loss, left ear* - **Left ear thresholds** demonstrate **normal hearing sensitivity** across frequencies without the bilateral elevation typical of sensorineural loss. - **Bone conduction remains normal** in the left ear, excluding any **inner ear or retrocochlear pathology**.

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

Brainstem Evoked Response Audiometry (BERA). **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.

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

Tympanosclerosis. **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.

Q: What is the threshold for moderate hearing loss?

41-55 dB. The classification of hearing loss is a high-yield topic for NEET-PG, primarily based on the **WHO (World Health Organization)** and **Goodman (1965)** classifications. Hearing loss is measured in decibels (dB) based on the pure-tone average across various frequencies. ### **Explanation of Options** * **Correct Answer: C (41-55 dB)** According to the standard classification, **Moderate Hearing Loss** falls within the **41-55 dB** range. At this level, a patient typically has significant difficulty following speech in noisy environments and may struggle to hear normal conversation without a hearing aid. * **Option A (26-40 dB):** This represents **Mild Hearing Loss**. Patients in this range can hear most speech but may miss soft sounds or distant speech. * **Option B (0-25 dB):** This is considered **Normal Hearing** in adults (though in children, the threshold for normal is often tighter, up to 15 dB). ### **WHO Classification Table (High-Yield)** | Degree of Hearing Loss | Range (dB) | | :--- | :--- | | **Normal** | 0 – 25 dB | | **Mild** | 26 – 40 dB | | **Moderate** | 41 – 55 dB | | **Moderately-Severe** | 56 – 70 dB | | **Severe** | 71 – 90 dB | | **Profound** | > 91 dB | ### **Clinical Pearls for NEET-PG** 1. **Social Adequacy Index:** The ability to hear and understand speech in everyday situations; the critical level for "social hearing" is usually considered **30 dB**. 2. **Speech Frequencies:** Pure Tone Audiometry (PTA) averages thresholds at **500 Hz, 1000 Hz, and 2000 Hz**. 3. **Hard of Hearing vs. Deaf:** Patients with mild to severe loss are "hard of hearing," while those with profound loss (>90 dB) are clinically "deaf."

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

Serous otitis media. **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.

Q: Otoacoustic emissions arise from which structure?

Outer hair cells. **Explanation:** Otoacoustic emissions (OAEs) are low-intensity sounds produced by the cochlea that can be measured in the external auditory canal. The correct answer is **Outer Hair Cells (OHCs)** because they possess a unique property called **electromotility**. This is mediated by a specialized motor protein called **Prestin**, which allows OHCs to physically contract and expand in response to sound. This mechanical activity acts as a "cochlear amplifier," enhancing the sensitivity and frequency selectivity of the ear. The byproduct of this mechanical energy leaks back through the middle ear and is recorded as OAEs. **Analysis of Options:** * **Inner Hair Cells (IHCs):** These are the primary sensory receptors that convert mechanical vibrations into neural signals (via the auditory nerve). They lack electromotility and do not produce OAEs. * **Both Inner and Outer Hair Cells:** Incorrect, as the active mechanical process is exclusive to the OHCs. * **Organ of Corti:** While the OHCs are located within the Organ of Corti, this option is too broad. In medical exams, the most specific anatomical structure (OHCs) is the preferred answer. **Clinical Pearls for NEET-PG:** * **Clinical Use:** OAEs are the gold standard for **Universal Newborn Hearing Screening (UNHS)** because they are non-invasive, objective, and quick. * **Pre-requisite:** To record OAEs, the patient must have a **normal middle ear status**. Any conductive hearing loss (e.g., serous otitis media) will block the emission. * **Hearing Loss Threshold:** OAEs are typically absent if there is sensorineural hearing loss exceeding **30–35 dB**. * **Distinction:** OAEs are present in **Auditory Neuropathy Spectrum Disorder (ANSD)**, but the BERA (Brainstem Evoked Response Audiometry) will be abnormal. This "OAE present, BERA absent" pattern is a high-yield diagnostic finding.

Question 1

What is the standard frequency used in tympanometry?

Accepted Answer

220 Hz

Answer

256 Hz

Answer

222 Hz

Answer

440 Hz

Question 2

In right-sided middle ear pathology, what will be the finding in Weber's test?

Accepted Answer

Lateralized to the right side

Answer

Normal

Answer

Centralized

Answer

Lateralized to the left side

Question 3

In which of the following conditions is the threshold for bone conduction normal and the threshold for air conduction increased?

Accepted Answer

Middle ear disease

Answer

Inner ear disease

Answer

Cochlear nerve lesion

Answer

Temporal lobe lesion

Question 4

An audiometry report is provided. Interpret the audiogram to determine the most probable diagnosis.

Accepted Answer

Conductive hearing loss, right ear

Answer

Conductive hearing loss, left ear

Answer

Sensorineural hearing loss, right ear

Answer

Sensorineural hearing loss, left ear

Question 5

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

Accepted Answer

Brainstem Evoked Response Audiometry (BERA)

Answer

Pure Tone Audiometry

Answer

High Frequency Audiometry

Answer

Tympanometry

Question 6

Rinne test is negative in which of the following conditions?

Accepted Answer

Tympanosclerosis

Answer

Sensorineural deafness

Answer

Acoustic neuroma

Answer

Meniere's disease

Question 7

What is the threshold for moderate hearing loss?

Accepted Answer

41-55 dB

Answer

26-40 dB

Answer

0-25 dB

Answer

None of the above

Question 8

Stapedial reflex is absent in:

Accepted Answer

VIIIth nerve lesion

Answer

VIth nerve lesion

Answer

Xth nerve lesion

Answer

Vth nerve lesion

Question 9

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

Accepted Answer

Serous otitis media

Answer

Ossicular discontinuity

Answer

Otosclerosis

Answer

All of the above

Question 10

Otoacoustic emissions arise from which structure?

Accepted Answer

Outer hair cells

Answer

Inner hair cells

Answer

Both inner and outer hair cells

Answer

Organ of Corti

Audiology and Speech Disorders — MCQs

Audiology and Speech Disorders — MCQs

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