Anatomy
1 questionsIn current medical practice, cephalic index is primarily used for
NEET-PG 2013 - Anatomy NEET-PG Practice Questions and MCQs
Question 731: In current medical practice, cephalic index is primarily used for
- A. Evaluation of skull deformities
- B. Assessment of craniosynostosis (Correct Answer)
- C. Clinical documentation of head shape
- D. Neurosurgical planning
Explanation: ***Assessment of craniosynostosis*** - The **cephalic index** (ratio of maximum head width to maximum head length × 100) provides a quantitative measure of head shape that can help characterize types of **craniosynostosis** [1]. - It helps differentiate patterns: **scaphocephaly** (dolichocephaly, CI <76), **brachycephaly** (CI >81), and **normocephaly** (CI 76-81). - In current practice, while **CT imaging** is the gold standard for diagnosing craniosynostosis, the cephalic index remains a useful **anthropometric measurement** in clinical assessment and documentation of cranial deformities. - It is particularly helpful in distinguishing **positional plagiocephaly** from **true craniosynostosis** when combined with clinical examination. *Evaluation of skull deformities* - The cephalic index can be used to evaluate various skull deformities, but this is too broad a description. - Its most specific clinical utility is in the context of **craniosynostosis assessment** where quantitative head shape measurements are diagnostically relevant [1]. - Many other skull deformities are assessed through direct clinical observation or specialized imaging rather than anthropometric indices. *Clinical documentation of head shape* - While the cephalic index does provide objective documentation of head shape, this describes its function rather than its primary **clinical indication**. - Documentation alone lacks the diagnostic and therapeutic implications that make cephalic index measurement clinically valuable. - In modern practice, simple descriptive terms (dolichocephaly, brachycephaly) are often used without calculating the precise index. *Neurosurgical planning* - Neurosurgical planning for craniosynostosis repair relies primarily on **CT scans with 3D reconstruction** to visualize suture fusion patterns, bone thickness, and intracranial anatomy. - The cephalic index provides diagnostic context but does not directly guide surgical technique, approach, or reconstruction planning. - Surgical decisions are based on imaging findings, age of the patient, and specific suture involvement rather than the numerical cephalic index value.
Community Medicine
4 questionsWhich of the following insects has shown the least widespread development of resistance to DDT?
What is the minimum contact period required for effective chlorination of drinking water?
Which of the following statements about slow sand filters is true?
What is a psychrometer used to measure?
NEET-PG 2013 - Community Medicine NEET-PG Practice Questions and MCQs
Question 731: Which of the following insects has shown the least widespread development of resistance to DDT?
- A. Mosquitoes
- B. Fleas
- C. Tsetse flies (Correct Answer)
- D. Ticks
Explanation: ***Tsetse flies*** - **Tsetse flies** have shown the least widespread development of **resistance to DDT**, likely due to their specific life cycles and limited exposure in widespread application campaigns. - This has made DDT, or its successor compounds, remain effective in certain tsetse control programs where other insects have developed high resistance. *Mosquitoes* - **Mosquitoes** have developed **widespread resistance to DDT** globally, significantly impacting malaria control efforts. - Their rapid breeding cycles and extensive exposure to DDT over decades led to the selection and proliferation of resistant strains. *Fleas* - **Fleas** have also developed **significant resistance to DDT**, especially in regions where it was heavily used for pest control in homes and livestock. - This resistance is a major factor in the continued prevalence of flea-borne diseases in certain areas. *Ticks* - **Ticks** have shown considerable development of **resistance to DDT** and other acaricides due to widespread use in livestock and agricultural settings. - Their resistance has complicated efforts to control tick-borne diseases and protect animal health.
Question 732: What is the minimum contact period required for effective chlorination of drinking water?
- A. 2 hrs
- B. 4 hrs
- C. 1 hour
- D. 30 minutes (Correct Answer)
Explanation: ***30 minutes*** - A minimum **contact period of 30 minutes** is generally recommended for effective chlorination to sufficiently inactivate most pathogenic microorganisms in drinking water. - This duration allows for adequate time for the **chlorine residual** to penetrate and destroy bacterial and viral structures. *1 hour* - While a longer contact time like 1 hour would be effective, it is not the **minimum required** for practical purposes and might lead to increased operational costs or complexity without significant additional benefit in typical scenarios. - Exceeding the minimum contact time can sometimes lead to the formation of **disinfection byproducts**, although this is more dependent on chlorine concentration and water composition. *2 hrs* - A contact time of 2 hours significantly exceeds the **minimum effective period** for most disinfection needs. - Such extended contact times are usually only considered in specific situations with highly resistant pathogens or particular water quality challenges, or when using **lower chlorine doses**. *4 hrs* - A 4-hour contact period is far beyond the **standard minimum** for effective chlorination of drinking water. - Such long contact times are typically impractical for municipal water treatment and could potentially increase the risk of forming **undesirable disinfection byproducts** if not carefully managed.
Question 733: Which of the following statements about slow sand filters is true?
- A. Is more expensive than other filters
- B. Requires a longer duration for filtration (Correct Answer)
- C. Uses sand size of 0.4 - 0.7 mm
- D. Occupies less space than other filters
Explanation: ***Requires a longer duration for filtration*** - **Slow sand filters** operate at a much lower filtration rate (0.1–0.4 m/h) compared to rapid sand filters, thus requiring a **longer duration** to process the same volume of water. - This low filtration rate allows for the formation of a biological layer, the **schmutzdecke**, which is responsible for much of the purification. *Is more expensive than other filters* - **Slow sand filters** are generally **less expensive to construct and operate** than rapid sand filters because they do not require extensive chemical coagulation, flocculation, or backwashing equipment. - Their primary cost is often land acquisition due to the **larger footprint** required. *Uses sand size of 0.4 - 0.7 mm* - **Slow sand filters** use **finer (smaller) sand**, typically with an **effective size of 0.15-0.30 mm**, which is smaller than the sand used in rapid sand filters (0.4-0.7 mm). - The smaller sand particle size contributes to the slower filtration rate and enhanced biological treatment. *Occupies less space than other filters* - **Slow sand filters** require **significantly more land area** than rapid sand filters for a given output because of their low filtration rate and large basin size. - This larger footprint can be a limiting factor in areas with high land costs.
Question 734: What is a psychrometer used to measure?
- A. Humidity level (Correct Answer)
- B. Airflow rate
- C. Ambient temperature
- D. Surface temperature
Explanation: ***Humidity level*** - A **psychrometer** measures **humidity**, specifically **relative humidity** and dew point. - It consists of two thermometers: a **dry-bulb** and a **wet-bulb** thermometer, which measure the cooling effect of evaporation. *Airflow rate* - **Airflow rate** is typically measured by devices such as **anemometers** or **flow meters**. - These instruments quantify the velocity or volume of air moving through a system. *Ambient temperature* - While a psychrometer includes dry-bulb thermometers that measure **ambient temperature**, its primary purpose is not just this, but rather to calculate **humidity** using the difference between wet and dry bulb readings. - A standard **thermometer** is a simpler and more direct tool for measuring only ambient temperature. *Surface temperature* - **Surface temperature** is usually measured using **infrared thermometers** or **thermocouples** placed in direct contact with a surface. - A psychrometer is designed to measure atmospheric conditions, not the temperature of a solid surface.
Dental
1 questionsWhich of the following methods is not recognized for dental age estimation in forensic odontology?
NEET-PG 2013 - Dental NEET-PG Practice Questions and MCQs
Question 731: Which of the following methods is not recognized for dental age estimation in forensic odontology?
- A. Panoramic X-ray evaluation
- B. Clinical examination
- C. Frame method (Correct Answer)
- D. Radiographic assessment
Explanation: ***Frame method*** - This is not a recognized method for **dental age estimation** in forensic odontology. The term "Frame method" does not correspond to any established technique used for this purpose. - While various imaging and assessment techniques are employed, this specific terminology is not standard. *Clinical examination* - **Clinical examination** is a foundational method for age estimation, especially in younger individuals, by observing the **eruption of deciduous and permanent teeth**. - It involves direct visual inspection of the oral cavity but has limitations for older individuals due to completed tooth eruption. *Radiographic assessment* - **Radiographic assessment** is a broad term encompassing various imaging techniques (like periapical, bitewing, or occlusal radiographs) to evaluate **tooth development stages** and **pulp calcification**, which are crucial for age estimation. - It allows for the visualization of internal tooth structures that are not visible during a clinical examination. *Panoramic X-ray evaluation* - **Panoramic X-rays** (orthopantomograms) are widely used in forensic odontology because they provide a comprehensive view of the entire dentition and surrounding structures in a single image. - They are particularly useful for assessing multiple teeth simultaneously, evaluating **tooth formation stages**, and observing **root development** and **pulp chamber changes**, which are critical indicators of age.
Forensic Medicine
2 questionsWhich of the following is NOT a sign of somatic death?
What is the time limit for exhumation in India?
NEET-PG 2013 - Forensic Medicine NEET-PG Practice Questions and MCQs
Question 731: Which of the following is NOT a sign of somatic death?
- A. Cessation of heart
- B. No response to external stimuli
- C. Rigor mortis (Correct Answer)
- D. Cessation of respiration
Explanation: ***Rigor mortis*** - **Rigor mortis** is a post-mortem change, occurring hours after death, characterized by muscle stiffening due to chemical changes after somatic death. - While it's a definitive sign of death, it is a secondary change occurring *after* the cessation of vital functions, not a primary sign of **somatic death** itself. *Cessation of respiration* - The complete and irreversible **cessation of respiration** (breathing) is a primary indicator of somatic death, as oxygen supply to tissues is halted. - This signifies the failure of the **respiratory system** to sustain life functions. *Cessation of heart* - The permanent **cessation of heart** function (cardiac arrest) is a fundamental sign of somatic death, leading to a lack of circulation and nutrient/oxygen delivery. - This marks the breakdown of the **circulatory system**, essential for maintaining life. *No response to external stimuli* - The absence of any **response to external stimuli**, including pain, light, and sound, indicates the complete loss of brain function and consciousness. - This signifies the irreversible failure of the **nervous system**, a key component of somatic death.
Question 732: What is the time limit for exhumation in India?
- A. One year
- B. Ten years
- C. One month
- D. No specific time limit (Correct Answer)
Explanation: ***No specific time limit*** - In India, there is **no specific legal time limit** for exhumation; it is subject to the discretion of a magistrate or judicial authority. - Exhumation is ordered if there is a **reasonable suspicion or compelling grounds** to believe that an examination of the remains will provide crucial evidence for a criminal investigation. *One month* - This is **incorrect** as there is no such restrictive time frame for exhumation in Indian law. - Exhumations are ordered based on the investigative needs, not arbitrary short deadlines. *One year* - This time limit is **not stipulated** in Indian legal provisions for exhumation. - The decision to exhume is made on a case-by-case basis, considering factors like the preservation status of the body and the potential evidentiary value. *Ten years* - There is **no fixed legal period** like ten years limiting exhumations in India. - The decaying state of a body over an extended period might reduce its forensic value, but technically, exhumation can still be ordered if deemed necessary for justice.
Surgery
2 questionsMost common organ involved in air blast injury is?
In blast injury, which organ is most likely to be damaged first?
NEET-PG 2013 - Surgery NEET-PG Practice Questions and MCQs
Question 731: Most common organ involved in air blast injury is?
- A. Ear drum (Correct Answer)
- B. Stomach
- C. Eye
- D. Lung
Explanation: ***Ear drum*** - The **tympanic membrane (eardrum)** is highly sensitive to changes in pressure, making it the most vulnerable and frequently injured organ during **air blast events**. - Its delicate structure can easily rupture due to the sudden, immense pressure wave. *Stomach* - While blast injuries can affect the gastrointestinal tract, causing conditions like **bowel perforation**, the stomach is less commonly and directly impacted than the eardrum. - Gastrointestinal injury usually results from a combination of **blast waves** and secondary effects like **fragmentation**. *Eye* - Eye injuries from blasts often involve **foreign bodies**, **ocular trauma**, or **thermal burns**, but direct **barotrauma** to the eye itself is less common than eardrum rupture. - The eye is somewhat protected by the bony orbit, offering a degree of shielding from direct blast effects. *Lung* - **Blast lung injury** is a serious, life-threatening condition involving pulmonary contusions, hemorrhage, and rupture of alveoli. - While significant, it is generally considered less frequent than eardrum perforation in overall blast injury cases.
Question 732: In blast injury, which organ is most likely to be damaged first?
- A. Tympanic membrane (Correct Answer)
- B. Liver
- C. Lung
- D. Gastrointestinal tract
Explanation: ***Tympanic membrane*** - The **tympanic membrane** is the most sensitive organ to the pressure waves generated by a blast, often rupturing even with relatively low blast overpressures. - Its thin, delicate structure and direct exposure to external air pressure make it highly vulnerable to barotrauma. *Gastrointestinal tract* - While the **gastrointestinal tract** can be damaged by blast waves, especially air-filled organs, this typically occurs after the tympanic membrane is affected. - Damage often includes hemorrhage, perforation, and mesenteric injury. *Liver* - The **liver** is a solid organ and is less susceptible to initial blast injury compared to air-filled structures. - Damage to the liver usually results from secondary mechanisms like blunt trauma from displacement or impact against other structures. *Lung* - **Blast lung** is a serious injury characterized by pulmonary contusions, hemorrhage, and edema, but it generally requires higher blast overpressure than tympanic membrane rupture. - The air-filled nature of the lungs makes them susceptible, but the tympanic membrane almost always fails first.