Community Medicine
2 questionsIn a given population: - less than 15 years: 6000 - 15 to 64 years: 12000 - 65 years and above: 2000 Calculate the dependency ratio.
In a study done in a hospital, patients were categorized into three groups based on disease prevalence (Low, Medium, High), and individuals were then randomly selected from each group. What type of sampling is this?
INI-CET 2025 - Community Medicine INI-CET Practice Questions and MCQs
Question 111: In a given population: - less than 15 years: 6000 - 15 to 64 years: 12000 - 65 years and above: 2000 Calculate the dependency ratio.
- A. 50 %
- B. 75 %
- C. 33 %
- D. 66 % (Correct Answer)
Explanation: ***66 %*** - The **Dependency Ratio** measures the ratio of the economically dependent population to the economically productive population, usually expressed as a percentage. - **Dependent Population** (aged < 15 and ≥ 65): 6000 + 2000 = **8000** - **Productive Population** (aged 15-64): **12000** - **Dependency Ratio**: (8000 / 12000) × 100 = **66.67%** (rounded to 66%) *Incorrect: 33 %* - This figure is significantly lower than the true ratio and results from calculating the ratio of the dependent population to the **total population**, which is not the standard definition of the Dependency Ratio. - 33.3% represents the dependent population (8000) as a proportion of the total population (20000), not the dependency burden on the working population. *Incorrect: 50 %* - This result is obtained if only the young dependent group is used in the numerator (Young Dependency Ratio = 6000 / 12000 = **50%**). - However, the total Dependency Ratio must account for **both young and old dependents** to accurately reflect the economic burden. *Incorrect: 75 %* - Obtaining 75% would require the dependent population to be 9000 (i.e., 9000 / 12000), which is higher than the actual 8000 dependents. - This option represents an overestimation of the dependent burden on the working population.
Question 112: In a study done in a hospital, patients were categorized into three groups based on disease prevalence (Low, Medium, High), and individuals were then randomly selected from each group. What type of sampling is this?
- A. Systematic random sampling
- B. Cluster random sampling
- C. Simple random sampling
- D. Stratified random sampling (Correct Answer)
Explanation: ***Correct: Stratified random sampling*** - This method involves dividing the population into non-overlapping subgroups (**strata**) based on a characteristic (here, disease prevalence: Low, Medium, High). - Subsequently, a **simple random sample** is drawn from *each* stratum independently to ensure representation from all groups. - This ensures that each subgroup is adequately represented in the final sample, making it ideal when the population has distinct subgroups. *Incorrect: Simple random sampling* - Every individual in the entire population has an equal and independent chance of being selected. - It does not involve dividing the population into specific subgroups or categories before selection. - This method may underrepresent or overrepresent certain subgroups by chance. *Incorrect: Systematic random sampling* - This involves selecting every *k*th element after a random start point, where *k* is the sampling interval (Population Size/Sample Size). - Like simple random sampling, it does not involve creating predefined strata based on characteristics like disease prevalence. - It's a simpler alternative to simple random sampling but doesn't ensure representation of specific subgroups. *Incorrect: Cluster random sampling* - The population is divided into natural groupings (**clusters**), such as geographical areas or schools. - Unlike stratification, entire clusters are randomly selected, and *all* individuals within the selected clusters (or a random sample thereof) are included in the study. - This differs from stratified sampling where we sample from ALL strata; in cluster sampling, we sample only SOME clusters.
ENT
3 questionsChoose the most appropriate candidates for cochlear implants: 1. Ototoxicity 2. Congenital hearing loss 3. Ossicular fixation 4. Otosclerosis
A 50-year-old female complains of an episode of acute vertigo with vomiting and unsteadiness and light-headedness, which was triggered by changing her head position in the morning. She denied hearing loss, recent viral illness, medication use, head injury, or trauma. Choose the most appropriate diagnosis:
Which of the following is incorrect regarding Juvenile Nasopharyngeal Angiofibroma (JNA)?
INI-CET 2025 - ENT INI-CET Practice Questions and MCQs
Question 111: Choose the most appropriate candidates for cochlear implants: 1. Ototoxicity 2. Congenital hearing loss 3. Ossicular fixation 4. Otosclerosis
- A. 3 and 4
- B. 1 and 2 (Correct Answer)
- C. 2 and 3
- D. 1 and 4
Explanation: ***1 and 2*** - **Ototoxicity** can cause severe to profound **sensorineural hearing loss**, which may warrant cochlear implant consideration if hearing aids provide insufficient benefit. - **Congenital hearing loss**, when severe to profound and sensorineural in nature, represents a classic indication for cochlear implantation, especially in children for speech and language development. *3 and 4* - **Ossicular fixation** primarily causes **conductive hearing loss** and is typically managed with **middle ear surgery** (ossiculoplasty), not cochlear implants. - **Otosclerosis** also causes **conductive hearing loss** affecting the stapes bone and is best treated with **stapedectomy**, not cochlear implantation. *2 and 3* - While **congenital hearing loss** can be appropriate for cochlear implants when severe to profound sensorineural, **ossicular fixation** is a **conductive pathology** treated surgically. - Combining a potential cochlear implant candidate with a condition requiring middle ear surgery creates an inappropriate pairing. *1 and 4* - **Ototoxicity** may lead to cochlear implant candidacy if it causes severe sensorineural loss, but **otosclerosis** is primarily a **conductive hearing loss** condition. - **Otosclerosis** responds well to **stapedectomy** with excellent hearing outcomes, making cochlear implantation unnecessary and inappropriate.
Question 112: A 50-year-old female complains of an episode of acute vertigo with vomiting and unsteadiness and light-headedness, which was triggered by changing her head position in the morning. She denied hearing loss, recent viral illness, medication use, head injury, or trauma. Choose the most appropriate diagnosis:
- A. Vestibular neuritis
- B. BPPV (Correct Answer)
- C. Acoustic neuroma
- D. Meniere disease
Explanation: ***Correct: BPPV*** - The characteristic presentation of **acute, brief episodes of vertigo** triggered specifically by **changing head position** (positional vertigo) is the hallmark of Benign Paroxysmal Positional Vertigo. - The absence of associated symptoms like **hearing loss**, new medications, or antecedent **viral illness** further supports BPPV, which is caused by dislodged **otoconia** floating in the semicircular canals. *Incorrect: Meniere disease* - This diagnosis is characterized by a specific triad: episodic vertigo, **fluctuating sensorineural hearing loss**, and **tinnitus** (aural fullness), which are absent in this presentation. - Vertigo attacks in Meniere disease are typically severe but **not necessarily positionally triggered** in the classic sense, lasting minutes to hours. *Incorrect: Vestibular neuritis* - Vestibular neuritis (or labyrinthitis if hearing is involved) causes a single, severe, **prolonged attack of vertigo** that lasts for days, not brief, positional episodes. - It is often preceded by a recent upper **respiratory tract infection** or viral syndrome, which the patient explicitly denied. *Incorrect: Acoustic neuroma* - An acoustic neuroma (**Vestibular Schwannoma**) typically presents with **slowly progressive unilateral sensorineural hearing loss** and **tinnitus**, often for months or years. - Acute, recurrent, positionally-triggered vertigo with vomiting is extremely atypical, as the symptoms caused by this tumor are usually **gradual** due to slow growth.
Question 113: Which of the following is incorrect regarding Juvenile Nasopharyngeal Angiofibroma (JNA)?
- A. Biopsy is contraindicated
- B. Epistaxis is the most common presenting symptom
- C. Unilateral cervical lymph nodes are a common feature (Correct Answer)
- D. Only seen in young boys
Explanation: ***Unilateral cervical lymph nodes are a common feature*** - This is the **INCORRECT** statement (correct answer for this negation question). - JNA is a **benign, non-metastatic tumor**; therefore, cervical lymphadenopathy is **NOT** a characteristic feature. - Palpable lymph nodes would suggest an inflammatory, infectious, or malignant process, which JNA is not. *Epistaxis is the most common presenting symptom* - This is a **correct** statement about JNA. - **Recurrent, profuse epistaxis** (nosebleeds) is indeed the most common presenting symptom due to the tumor's highly vascular nature. - The tumor is composed of numerous thin-walled blood vessels lacking smooth muscle, leading to easy bleeding. *Only seen in young boys* - This is a **correct** statement about JNA. - JNA almost exclusively occurs in **adolescent males** (typically between 10 and 25 years old) due to its androgen-dependent nature. - The extreme rarity in females suggests a strong hormonal etiology related to male sex hormones. *Biopsy is contraindicated* - This is a **correct** statement about JNA. - Biopsy is strictly **contraindicated** due to the high risk of **catastrophic, life-threatening hemorrhage**. - Diagnosis is typically made clinically and confirmed by high-resolution imaging (CT/MRI) showing a classic enhancing mass at the **sphenopalatine foramen** in the posterolateral nasopharynx.
Ophthalmology
3 questionsWhich of the following is seen in proliferative diabetic retinopathy?
Following a fungal corneal ulcer, a farmer underwent corneal transplant surgery. What is the preservative used for storing the donor corneal graft and the suture material used in the procedure?
Acute hemorrhagic conjunctivitis is caused by which of the following combinations?
INI-CET 2025 - Ophthalmology INI-CET Practice Questions and MCQs
Question 111: Which of the following is seen in proliferative diabetic retinopathy?
- A. Tractional retinal detachment (Correct Answer)
- B. No retinal detachment
- C. Exudative retinal detachment
- D. Rhegmatogenous retinal detachment
Explanation: ***Tractional retinal detachment*** - This is the hallmark complication of **Proliferative Diabetic Retinopathy (PDR)**, caused by the contraction of **fibrovascular tissue** growing on the retinal surface. - The pulling force separates the sensory retina from the **retinal pigment epithelium (RPE)**, often leading to slow, progressive vision loss. *Rhegmatogenous retinal detachment* - This results from a **full-thickness retinal break** that allows fluid vitreous to pass into the subretinal space. - Pure rhegmatogenous detachment is less common in PDR; diabetic detachments are typically **tractional** or occasionally mixed **tractional-rhegmatogenous**. *Exudative retinal detachment* - This type is caused by fluid accumulation due to leakage through intact vessels, often associated with conditions like **posterior scleritis** or choroidal tumors. - It is characterized by highly mobile subretinal fluid that shifts with changes in head position, a finding not typical of PDR's primary mechanism. *No retinal detachment* - Although not all patients with PDR develop detachment, the condition is defined by the high risk of severe complications, including **tractional retinal detachment** and **vitreous hemorrhage**. - PDR is the stage where extensive **neovascularization** occurs, structurally predisposing the eye to retinal separation.
Question 112: Following a fungal corneal ulcer, a farmer underwent corneal transplant surgery. What is the preservative used for storing the donor corneal graft and the suture material used in the procedure?
- A. Polyethylene glycol, Nylon
- B. Moist chamber, Vicryl
- C. Ethanol, Silk
- D. McCarey-Kaufman, Nylon (Correct Answer)
Explanation: ***McCarey-Kaufman, Nylon*** - **McCarey-Kaufman (MK) medium** is the classic short-term preservation medium (effective for up to 4 days) traditionally used for storing donor corneal grafts, ensuring the vitality of the essential **endothelial cells**. *Note: Modern practice now primarily uses Optisol-GS, Cornisol, or Eusol-C for longer storage (14+ days), but MK medium remains the standard textbook answer.* - The procedure employs fine, non-absorbable **10-0 Nylon** monofilament sutures, which is the standard material for penetrating keratoplasty and maintains long-term structural integrity and precise corneal curvature. *Incorrect: Polyethylene glycol, Nylon* - **Polyethylene glycol (PEG)** is an osmotic agent and lubricant but is not utilized as the primary, formulated storage medium for whole donor corneal grafts required for transplantation. - While **Nylon** is the correct suture material, the incorrect association with PEG as the storage medium makes this option unsuitable. *Incorrect: Ethanol, Silk* - **Ethanol** is highly damaging and denaturing to living tissues, particularly the delicate **corneal endothelium**, rendering the graft non-viable upon exposure. - **Silk** sutures are generally avoided in penetrating keratoplasty because they are braided, have high tissue reactivity, and carry a risk of introducing infection or generating excessive inflammation. *Incorrect: Moist chamber, Vicryl* - Storage in a **moist chamber** offers minimal nutritional support and is only suitable for very short-term storage (<24 hours), often resulting in significant **endothelial cell loss** for longer storage periods. - **Vicryl** (Polyglactin 910) is an **absorbable suture** that breaks down rapidly, making it inappropriate for penetrating keratoplasty where non-absorbable material is needed to maintain tectonic support and corneal shape for extended periods.
Question 113: Acute hemorrhagic conjunctivitis is caused by which of the following combinations?
- A. Coxsackie A and Enterovirus 70 (Correct Answer)
- B. Coxsackie B and Enterovirus 70
- C. Coxsackie A, Coxsackie B and Enterovirus 70
- D. Coxsackie A and Coxsackie B
Explanation: ***Coxsackie A and Enterovirus 70 (Correct Answer)*** - **Enterovirus 70 (EV70)** is one of the two main causative agents historically responsible for rapid, widespread, and explosive epidemics of Acute Hemorrhagic Conjunctivitis (AHC) worldwide. - **Coxsackievirus A24 variant (CA24v)** is the other significant cause of AHC, often causing large outbreaks that are clinically indistinguishable from those caused by EV70. - This combination represents the **established etiology** of epidemic acute hemorrhagic conjunctivitis. *Coxsackie B and Enterovirus 70* - While **Enterovirus 70** is correct, **Coxsackievirus B** is primarily associated with systemic illnesses like **myocarditis**, pericarditis, and pleurodynia, rather than AHC. - The critical combination responsible for AHC epidemics involves a specific variant of **Coxsackievirus A (A24v)**, not B, alongside EV70. *Coxsackie A, Coxsackie B and Enterovirus 70* - This option is inaccurate because the inclusion of **Coxsackievirus B** (associated with diseases other than AHC) makes the combination incorrect as a primary etiology. - AHC etiology relies specifically on **Enterovirus 70** and the pathogenic strain **Coxsackievirus A24 variant (CA24v)**. *Coxsackie A and Coxsackie B* - This combination is incomplete because it omits **Enterovirus 70 (EV70)**, which is arguably the most important etiological agent known for causing severe, hemorrhagic, epidemic conjunctivitis. - **Coxsackievirus B** is not a typical agent of AHC, further making this combination incorrect for the clinical syndrome described.
Pediatrics
2 questionsWhich of the following diagnoses can cause stridor in infants? 1. Laryngomalacia 2. Congenital hemangioma 3. Subglottic stenosis 4. Recurrent respiratory papillomatosis (RRP)
A 7-year-old child with a history of ear infection is complaining of lockjaw and limb spasm/fever/neck rigidity. Choose the most appropriate diagnosis:
INI-CET 2025 - Pediatrics INI-CET Practice Questions and MCQs
Question 111: Which of the following diagnoses can cause stridor in infants? 1. Laryngomalacia 2. Congenital hemangioma 3. Subglottic stenosis 4. Recurrent respiratory papillomatosis (RRP)
- A. 1, 3 and 4 (Correct Answer)
- B. 1 and 3
- C. 2 and 3
- D. 1 and 4
Explanation: ***1, 3 and 4*** - This option correctly identifies the three most common and clinically significant causes of stridor in infants - **Laryngomalacia (1)** is the most common cause of congenital stridor (60-75% of cases), presenting with inspiratory stridor that worsens with agitation - **Subglottic stenosis (3)** is the second most common cause of congenital stridor, presenting with biphasic stridor and may be congenital or acquired - **Recurrent respiratory papillomatosis/RRP (4)** caused by HPV (types 6 and 11) causes progressive airway obstruction with stridor and hoarseness - While congenital (subglottic) hemangiomas can cause stridor, they are less common than the above three conditions and typically present between 1-3 months of age *Incorrect: 1 and 3* - This option is incomplete as it excludes **RRP (4)**, which is an important cause of pediatric airway obstruction - RRP typically presents in early childhood and requires serial surgical debulking *Incorrect: 2 and 3* - This option incorrectly excludes **Laryngomalacia (1)**, which is the single most common cause of stridor in infants - Missing laryngomalacia in the differential diagnosis would be a significant oversight *Incorrect: 1 and 4* - This option fails to include **Subglottic stenosis (3)**, the second most common cause of congenital stridor - Subglottic stenosis can be life-threatening and requires urgent evaluation and management
Question 112: A 7-year-old child with a history of ear infection is complaining of lockjaw and limb spasm/fever/neck rigidity. Choose the most appropriate diagnosis:
- A. Meningitis
- B. Tetanus (Correct Answer)
- C. Bezold abscess
- D. Sinus thrombosis
Explanation: ***Tetanus*** - The striking combination of **lockjaw (trismus)** and generalized **limb spasms** is the hallmark clinical presentation of **Tetanus**, caused by the neurotoxin from *Clostridium tetani*. - The presence of **fever** and **neck rigidity** alongside an antecedent **ear infection** (potential portal of entry) strongly supports this diagnosis. - Tetanus causes sustained muscle contractions due to the inhibition of inhibitory neurons, leading to characteristic trismus, risus sardonicus, and opisthotonus. - Note: This is distinct from metabolic **tetany** (hypocalcemia), which causes carpopedal spasm without fever or lockjaw. *Incorrect: Meningitis* - While meningitis causes **fever** and **neck rigidity** (nuchal rigidity), it does not typically present with severe **lockjaw (trismus)** or sustained generalized **muscle spasms**. - Meningitis usually presents with headache, photophobia, altered consciousness, and positive Kernig's/Brudzinski's signs. *Incorrect: Bezold abscess* - A Bezold abscess is a deep neck abscess complicating mastoiditis, causing localized symptoms like neck pain, swelling, and **torticollis** (fixed head tilt). - It does not cause neuromuscular hyperexcitability resulting in **lockjaw** and widespread **limb spasms**. *Incorrect: Sinus thrombosis* - Lateral sinus thrombosis is a complication of otitis media presenting with **picket-fence fever**, headache, and signs of raised intracranial pressure. - It does not cause the characteristic muscle spasms and lockjaw seen in this presentation.